---
page_id: wsd-analog-d5c116ca
type: context-page
schema_version: 1
template_id: discord-page
template_version: template-0.1.0
title: "#๐ฐ๏ธ-analog"
slug: wsd-analog-d5c116ca
route: /evidence/designing/analog
section: reference
access: public
summary: 415 Discord messages from ๐ - Designing/analog/channel.md.
status: published
asset_base: .
home_href: /
md_url: /evidence/designing/analog.md
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tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
talk_url: /evidence/designing/analog.talk.md
talk_route: /evidence/designing/analog/talk
---
# #๐ฐ๏ธ-analog
Category: **๐ - Designing**
Channel ID: `1408135265427394661`
Messages: **415**
## message-1408135402891640905
**2025-08-21T17:07:21.94+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1408135402891640905`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1408135402891640905
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-08/2025-08.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-08/2025-08.json
**Content**
```text
@Tim Edwards, @Tholin had some questions / thoughts about analog stuff on GF180MCU.
```
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---
## message-1408137402173624442
**2025-08-21T17:15:18.606+00:00 โ Tholin (@tholin)**
- Message ID: `1408137402173624442`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1408137402173624442
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-08/2025-08.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-08/2025-08.json
**Content**
```text
Not really questions as much as I just wanna mess around and find out with some analog circuits on my next GF180 tapeout.
```
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---
## message-1408150314347139184
**2025-08-21T18:06:37.108+00:00 โ Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1408150314347139184`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1408150314347139184
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-08/2025-08.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-08/2025-08.json
**Content**
```text
Sure, analog IP is yet another need for GF180MCU. I would take a look at what's being produced for Chipathon. I have been running my own track so I haven't been looking at what the analog groups have been doing, but for the record, you can find the Chipathon discussions on fossi-chat.org under the "Chipathon 2025" channel, or on github at https://github.com/sscs-ose/sscs-chipathon-2025/issues.
```
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---
## message-1408316135874760817
**2025-08-22T05:05:32.041+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1408316135874760817`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1408316135874760817
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-08/2025-08.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-08/2025-08.json
**Content**
```text
There is a bunch of interesting information in the Chipathon page @ https://github.com/sscs-ose/sscs-chipathon-2025/tree/main/resources/Integration
```
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---
## message-1408453485195690046
**2025-08-22T14:11:18.671+00:00 โ Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1408453485195690046`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1408453485195690046
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-08/2025-08.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-08/2025-08.json
**Content**
```text
@Tim 'mithro' Ansell : If nothing else, Chipathon 2025 is surfacing a number of issues in the GF180MCU open PDK that needed to be addressed, and they are getting fixed, which will definitely benefit you and wafer.space for the first shuttle run.
```
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---
## message-1408486036991901819
**2025-08-22T16:20:39.624+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1408486036991901819`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1408486036991901819
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-08/2025-08.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-08/2025-08.json
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- https://discord.com/channels/1361349522684510449/1408135265427394661/1408453485195690046
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```text
Yeap! You know I'm a big believer that quality is related to the number of users.
```
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---
## message-1419667701088911361
**2025-09-22T12:52:36.09+00:00 โ Tholin (@tholin)**
- Message ID: `1419667701088911361`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1419667701088911361
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-09/2025-09.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-09/2025-09.json
**Content**
```text
I tried doing analog for the first time and its going quite well, actually.
```
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---
## message-1419669482619801603
**2025-09-22T12:59:40.84+00:00 โ tnt (@246tnt)**
- Message ID: `1419669482619801603`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1419669482619801603
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-09/2025-09.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-09/2025-09.json
**Content**
```text
At 5V with that much headroom, I'd hope so ๐
```
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---
## message-1419671807291691143
**2025-09-22T13:08:55.085+00:00 โ Tholin (@tholin)**
- Message ID: `1419671807291691143`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1419671807291691143
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-09/2025-09.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-09/2025-09.json
**Content**
```text
The opamps I can build here are not nearly rail-to-rail and have some nasty nonlinearities on the output the more you move away from 2.5V in either direction.
```
**Reactions**
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---
## message-1419679392216645843
**2025-09-22T13:39:03.472+00:00 โ Tholin (@tholin)**
- Message ID: `1419679392216645843`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1419679392216645843
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-09/2025-09.json
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**Content**
```text
As for why I need a sine/cosine wave generator: I am trying to generate the chroma component of a color NTSC signal. Because why do something the easy way when you can loose your sanity doing it the hard way?
```
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---
## message-1425663911406862337
**2025-10-09T01:59:24.034+00:00 โ madbrain (@mrmadbrain)**
- Message ID: `1425663911406862337`
- Author ID: `316742122751655939`
- Nickname: madbrain
- User name: mrmadbrain
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1425663911406862337
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-10/2025-10.json
**Content**
```text
ooh, so it's basically close to a 3.58 mhz bandpass filter? :3
```
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---
## message-1425700758694658099
**2025-10-09T04:25:49.112+00:00 โ peterkinget**
- Message ID: `1425700758694658099`
- Author ID: `853313068871188530`
- Nickname: peterkinget
- User name: peterkinget
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1425700758694658099
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**Content**
```text
If you are looking for example projects and designs, mostly in analog, take a look at https://vlsidesignlab.org. The site has several years of project websites and videos of the VLSI design lab class at Columbia University where students design a chip in the spring, it gets fabricated in summer, and they test it in fall. There is quite a bit of design information available, and there is a search and index also. Have fun!
```
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---
## message-1426213521422815293
**2025-10-10T14:23:21.273+00:00 โ madbrain (@mrmadbrain)**
- Message ID: `1426213521422815293`
- Author ID: `316742122751655939`
- Nickname: madbrain
- User name: mrmadbrain
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1426213521422815293
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-10/2025-10.json
**Content**
```text
Question... Is it reasonable to try to implement an Operational Transconductance Amplifier in the target process? - something in the vein of LM13700 ( https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.ti.com/lit/ds/symlink/lm13700.pdf&ved=2ahUKEwiOqube6ZmQAxWEj4kEHSjgB54QFnoECBkQAQ&usg=AOvVaw3GXAglJwE-LG-Gg1gfRkxv )... if yes, I imagine it might have tighter limits on currents/voltage/wattage?
```
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---
## message-1426374309911335022
**2025-10-11T01:02:16.236+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1426374309911335022`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1426374309911335022
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-10/2025-10.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1426213521422815293
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```text
@Tim Edwards - Any thoughts on @madbrain's question?
```
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---
## message-1427200882931400774
**2025-10-13T07:46:46.601+00:00 โ Valgamaa (@valgamaa)**
- Message ID: `1427200882931400774`
- Author ID: `732905260091310090`
- Nickname: Valgamaa
- User name: valgamaa
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1427200882931400774
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1426213521422815293
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```text
You won't have anything like the supply range of the 13700, which is over 30 volts (from memory). If that isn't an issue then there is nothing to stop you making such a circuit while also including extra circuits like a voltage-controlled input for gm control. I used a similar process for a 4MHz gm-C bandpass filter many years ago with good results, and there are many MOS 'tricks' that you can use to get significantly lower distortion than the 13700 has.
```
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---
## message-1427201726154408007
**2025-10-13T07:50:07.641+00:00 โ madbrain (@mrmadbrain)**
- Message ID: `1427201726154408007`
- Author ID: `316742122751655939`
- Nickname: madbrain
- User name: mrmadbrain
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1427201726154408007
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-10/2025-10.json
**Content**
```text
great to know ๐ the applications I'm looking into are boutique synthesizers so the S-curve shaped distortion is often a feature rather than a bug ๐
```
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---
## message-1427216446047518780
**2025-10-13T08:48:37.137+00:00 โ Valgamaa (@valgamaa)**
- Message ID: `1427216446047518780`
- Author ID: `732905260091310090`
- Nickname: Valgamaa
- User name: valgamaa
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1427216446047518780
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-10/2025-10.json
**Content**
```text
You won't get a tanh curve, but you will get something similar with MOS transistors. DC offsets might need some consideration and the capacitor options on-chip will be too low density to be much use. Making the circuits differential might give the headroom you will want, and with that gyrators become very simple (that's the key to most filters in CMOS) but I doubt you will want to implement standard filter responses like Butterworth etc. I half-wondered if it might be synthesiser-related when I saw mention of the 13700!
```
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---
## message-1427223856355213353
**2025-10-13T09:18:03.892+00:00 โ madbrain (@mrmadbrain)**
- Message ID: `1427223856355213353`
- Author ID: `316742122751655939`
- Nickname: madbrain
- User name: mrmadbrain
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1427223856355213353
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-10/2025-10.json
**Content**
```text
yeah typically for synthesizers the more common filter types are state variable (SVF) and moog-style 4 pole ladder... often deliberately non-linear so that the response doesn't blow up when you crank up the Q-factor... might have to look into having the output current mirrors have a digitally controllable multiplication factor ๐ค
```
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---
## message-1427244764423655456
**2025-10-13T10:41:08.764+00:00 โ Valgamaa (@valgamaa)**
- Message ID: `1427244764423655456`
- Author ID: `732905260091310090`
- Nickname: Valgamaa
- User name: valgamaa
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1427244764423655456
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
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**Content**
```text
The SSM2044-type topology would map onto this process pretty well, I think. How much experience do you have with MOS circuit design? Most of the blocks you would want for a synthesiser are a really good vehicle to cover most of the circuit topologies that make for good CMOS design. A temperature-insensitive VCO should also be quite practical in this process too.
```
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---
## message-1427287256338665596
**2025-10-13T13:29:59.626+00:00 โ madbrain (@mrmadbrain)**
- Message ID: `1427287256338665596`
- Author ID: `316742122751655939`
- Nickname: madbrain
- User name: mrmadbrain
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1427287256338665596
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
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**Content**
```text
I'm kindof out of my depth ngl :3 my usual gig is synths in C++ on desktop computers
```
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---
## message-1427321156603609193
**2025-10-13T15:44:42.079+00:00 โ madbrain (@mrmadbrain)**
- Message ID: `1427321156603609193`
- Author ID: `316742122751655939`
- Nickname: madbrain
- User name: mrmadbrain
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1427321156603609193
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-10/2025-10.json
**Content**
```text
(and reverse engineering... including some time on the CEM synthesizer chips which are really all OTA variants similar to lm13700 inside in different arrangements...)
```
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---
## message-1428161230907904072
**2025-10-15T23:22:51.401+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1428161230907904072`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1428161230907904072
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
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**Content**
```text
https://hackaday.com/2025/10/15/more-than-100-sub-circuit-designs-from-texas-instruments/
```
**Embeds**
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---
## message-1429228175019347969
**2025-10-18T22:02:30.7+00:00 โ madbrain (@mrmadbrain)**
- Message ID: `1429228175019347969`
- Author ID: `316742122751655939`
- Nickname: madbrain
- User name: mrmadbrain
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1429228175019347969
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-10/2025-10.json
**Content**
```text
it's all op amp basic circuits for the most part?
```
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---
## message-1432427038031220899
**2025-10-27T17:53:39.074+00:00 โ Mark Anderson (@markemer)**
- Message ID: `1432427038031220899`
- Author ID: `323874444344950794`
- Nickname: Mark Anderson
- User name: markemer
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1432427038031220899
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-10/2025-10.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1425700758694658099
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That rules. My design class just built in IBM8RF but we did not build it as it was too expensive. Hilariously 8RF was either 130 or 90nm, so the stuff we're doing now. Although it was SOI.
```
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---
## message-1434028768942493696
**2025-11-01T03:58:21.482+00:00 โ social (@_.social._)**
- Message ID: `1434028768942493696`
- Author ID: `403695211408130049`
- Nickname: social
- User name: _.social._
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1434028768942493696
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**Content**
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hi there. anyone down to talk about silicon production (analog chips) in older processes? i'm talking to a fab and they're telling me the kind of design that i am talking to them about could result in a bunch of crosstalk, so i'm looking for ideas on how to mitigate that. the chip carries analog audio, so this is about capacitive coupling.
```
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---
## message-1435071254611624000
**2025-11-04T01:00:49.434+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1435071254611624000`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1435071254611624000
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```text
I would just do a tapeout with Tiny Tapeout and see if it matches expectations
```
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---
## message-1435071454310830150
**2025-11-04T01:01:37.046+00:00 โ social (@_.social._)**
- Message ID: `1435071454310830150`
- Author ID: `403695211408130049`
- Nickname: social
- User name: _.social._
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1435071454310830150
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-11/2025-11.json
**Content**
```text
tiny tapeout is great, but my ultimate goal is to go into commercial production with a fab
```
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---
## message-1435071580945518682
**2025-11-04T01:02:07.238+00:00 โ social (@_.social._)**
- Message ID: `1435071580945518682`
- Author ID: `403695211408130049`
- Nickname: social
- User name: _.social._
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1435071580945518682
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-11/2025-11.json
**Content**
```text
however, i resolved the crosstalk issue. i guess it was a translation problem between russian and english.
```
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---
## message-1435071716081533133
**2025-11-04T01:02:39.457+00:00 โ social (@_.social._)**
- Message ID: `1435071716081533133`
- Author ID: `403695211408130049`
- Nickname: social
- User name: _.social._
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1435071716081533133
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-11/2025-11.json
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**Content**
```text
they didn't mean to say it was going to create a bunch of crosstalk, they were telling me they had a solution which has low cross talk.
```
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---
## message-1435071785916956754
**2025-11-04T01:02:56.107+00:00 โ social (@_.social._)**
- Message ID: `1435071785916956754`
- Author ID: `403695211408130049`
- Nickname: social
- User name: _.social._
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1435071785916956754
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-11/2025-11.json
**Content**
```text
they just didn't know how to say it ๐
```
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---
## message-1442548790430007329
**2025-11-24T16:13:52.899+00:00 โ tnt (@246tnt)**
- Message ID: `1442548790430007329`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1442548790430007329
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-11/2025-11.json
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**Content**
```text
So I'm trying to work on the power gates for TT but hitting some DRC errors. In particular `NP.12` I don't understand.
```
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## message-1442549125844566057
**2025-11-24T16:15:12.868+00:00 โ tnt (@246tnt)**
- Message ID: `1442549125844566057`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1442549125844566057
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-11/2025-11.json
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**Content**
```text
`NP.12 : Overlap with P-channel poly2 gate extension is forbidden within 0.32um of P-channel gate.`
Which I understand as, "NPlus can't overlap poly that's used by a pmos if that poly is closer than 0.32um to the actual gate zone"
```
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---
## message-1442549382921715732
**2025-11-24T16:16:14.16+00:00 โ tnt (@246tnt)**
- Message ID: `1442549382921715732`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1442549382921715732
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2025-11/2025-11.json
**Content**
```text
But then I get this from the DRC. ( Only `COMP` / `Nplus` / `Poly` shown ). And the `Nplus` doesn't overlat `Poly` _at_ _all_ ...
```
**Attachments**
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---
## message-1442707763753914464
**2025-11-25T02:45:35.093+00:00 โ bailey (@bailey8889)**
- Message ID: `1442707763753914464`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `ThreadCreated`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1442707763753914464
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-11/2025-11.json
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**Reply/reference**
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**Content**
```text
Started a thread.
```
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---
## message-1449050919206518824
**2025-12-12T14:51:01.203+00:00 โ dkktvtcdrmpusap (@dkktvtcdrmpusap_57896)**
- Message ID: `1449050919206518824`
- Author ID: `1447627081071591546`
- Nickname: dkktvtcdrmpusap
- User name: dkktvtcdrmpusap_57896
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1449050919206518824
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2025-12/2025-12.json
**Content**
```text
||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ||||โ|| _ _ _ _ _ _ https://imgur.com/lUxe13P https://imgur.com/9xq8zso https://imgur.com/DEwAKqa https://imgur.com/hxTkjHU @here
```
**Embeds**
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---
## message-1461780860943597700
**2026-01-16T17:55:15.824+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1461780860943597700`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1461780860943597700
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-01/2026-01.json
**Content**
```text
Been dabbling with analog recently and was curiosu if any of the automated analog layout tools worked well. ALIGN (https://github.com/ALIGN-analoglayout/ALIGN-public) looked most promising and had a Sky130 PDK, so I threw Claude Code at it. Sorta have a working GF180 PDK now? Takes in a spice netlist, constraints (matching, symmetry, etc) and spits out GDS
Found some pretty serious limitations though, namely that ALIGN was built with finfet nodes in mind so there are a lot of restrictive routing/placement constraints baked into the core. Had to modify the core to get even moderately compact layouts and it's still a lot of wasted space. DRC and LVS match, but haven't run simulations on the generated output yet... could be hot garbage ๐
Still, neato tool. Kinda want to start working on something that's tailored for big legacy nodes that have less restrictive DRC.
(screenshot is a CSA + Discriminator + Krummenacher feedback circuit that i've been playing around with)
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01_media/Screenshot202026-01-1620084816-8E5A4.png
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---
## message-1462073625485246616
**2026-01-17T13:18:36.33+00:00 โ Matt Venn (@mattvenn)**
- Message ID: `1462073625485246616`
- Author ID: `492702620759228416`
- Nickname: Matt Venn
- User name: mattvenn
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1462073625485246616
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-01/2026-01.json
**Content**
```text
Harald pretl also tested an automatic layout tool on tt05
```
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---
## message-1462073981690446069
**2026-01-17T13:20:01.256+00:00 โ Matt Venn (@mattvenn)**
- Message ID: `1462073981690446069`
- Author ID: `492702620759228416`
- Nickname: Matt Venn
- User name: mattvenn
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1462073981690446069
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https://tinytapeout.com/chips/tt05/tt_um_tt05_analog_test
```
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---
## message-1463071530153021483
**2026-01-20T07:23:55.343+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1463071530153021483`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1463071530153021483
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01.json
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@BreakingTaps - Take a look at OpenFASoC from Mehdi
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---
## message-1463071629297844368
**2026-01-20T07:24:18.981+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1463071629297844368`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1463071629297844368
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01.json
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@BreakingTaps - https://www.crowdsupply.com/wafer-space/gf180mcu-run-1/updates/openfasoc
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---
## message-1463226087860469761
**2026-01-20T17:38:04.772+00:00 โ Clyde Laforge (@scafir)**
- Message ID: `1463226087860469761`
- Author ID: `1401841055975870476`
- Nickname: Clyde Laforge
- User name: scafir
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1463226087860469761
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-01/2026-01.json
**Content**
```text
Finally got the LVS working end-to-end from xschem to klayout without any manual conversion steps from a user point of view ๐
Just need to wait for @Leo Moser (mole99) to upstream the improvements from wafer space now ๐
```
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---
## message-1463229843440144394
**2026-01-20T17:53:00.172+00:00 โ tnt (@246tnt)**
- Message ID: `1463229843440144394`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1463229843440144394
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-01/2026-01.json
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And did you check you didn't break the xschem / magic / netgen flow ? (like if you changed anything in the xschem symbols for instance that could break the other flows ... )
```
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---
## message-1463231137777451070
**2026-01-20T17:58:08.766+00:00 โ Clyde Laforge (@scafir)**
- Message ID: `1463231137777451070`
- Author ID: `1401841055975870476`
- Nickname: Clyde Laforge
- User name: scafir
- Type: `Reply`
- Edited: 2026-01-20T18:10:51.038+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1463231137777451070
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01.json
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The changes are fully contained in the klayout directory, so likelihood of breaking other flows is rather low
```
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---
## message-1463247695719305372
**2026-01-20T19:03:56.487+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1463247695719305372`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1463247695719305372
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01.json
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**Reply/reference**
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Awesome Clyde ๐ฅณ
I'll start upstreaming the wafer.space changes to the FOSSi repos soon. However, you don't necessarily have to wait for that, since your LVS changes should be standalone?
```
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---
## message-1463271781820268710
**2026-01-20T20:39:39.061+00:00 โ Clyde Laforge (@scafir)**
- Message ID: `1463271781820268710`
- Author ID: `1401841055975870476`
- Nickname: Clyde Laforge
- User name: scafir
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1463271781820268710
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01.json
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**Reply/reference**
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It is slightly dependent, as it adds new GUI options, but let's discuss it when I open the MR, maybe they are not necessary
```
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---
## message-1463409587779666033
**2026-01-21T05:47:14.562+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1463409587779666033`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1463409587779666033
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-01/2026-01.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-01/2026-01.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1463071629297844368
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oh neat! Will give this a closer read tomorrow
```
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---
## message-1479386867035144244
**2026-03-06T07:55:14.78+00:00 โ Thomas Dexter (@tdextrous)**
- Message ID: `1479386867035144244`
- Author ID: `661042976646103116`
- Nickname: Thomas Dexter
- User name: tdextrous
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1479386867035144244
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-03/2026-03.json
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**Content**
```text
I'm curious if anyone has had success designing inductors in this process? The top metal seems good enough but wondering if metal fill (assuming it is done by the fab and not in the designer's control) would make the final results unpredictable.
```
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---
## message-1479389805681967130
**2026-03-06T08:06:55.408+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1479389805681967130`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `ThreadCreated`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1479389805681967130
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Started a thread.
```
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---
## message-1481885014231879680
**2026-03-13T05:21:59.485+00:00 โ beardothaweirdo (@wspitts2)**
- Message ID: `1481885014231879680`
- Author ID: `1034663307598123049`
- Nickname: beardothaweirdo
- User name: wspitts2
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1481885014231879680
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-03/2026-03.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1479386867035144244
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```text
If you like, I can see if I can figure out how we got ASITIC working at our site... I did fix cadence's inductor pcell generator. I could reach out to them and see if they would let me put it in the wild as well. It was broken forever until I found the need to stand it up to do EMX inductors on Sky130.
```
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---
## message-1481885255936774318
**2026-03-13T05:22:57.112+00:00 โ beardothaweirdo (@wspitts2)**
- Message ID: `1481885255936774318`
- Author ID: `1034663307598123049`
- Nickname: beardothaweirdo
- User name: wspitts2
- Type: `Default`
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**Content**
```text
ASITIC is opensource inductor simulator.
```
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---
## message-1483002780330360985
**2026-03-16T07:23:35.69+00:00 โ nmz787**
- Message ID: `1483002780330360985`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1483002780330360985
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-03/2026-03.json
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**Content**
```text
anyone here using openEMS/elmer/palace/etc for getting SPICE model and simulating analog front-ends?
```
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---
## message-1483646099750391869
**2026-03-18T01:59:54.992+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1483646099750391869`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1483646099750391869
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-03/2026-03.json
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**Content**
```text
@nmz787 - There are a few examples mentioned on the Zero to ASIC Course YouTube channel I think.
```
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---
## message-1483694160891351212
**2026-03-18T05:10:53.661+00:00 โ Vipul (@vipul.sh)**
- Message ID: `1483694160891351212`
- Author ID: `1214459146217201704`
- Nickname: Vipul
- User name: vipul.sh
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1483694160891351212
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-03/2026-03.json
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Have used openems to generate inductor s2p model for IHP.
```
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---
## message-1483964549718872124
**2026-03-18T23:05:19.381+00:00 โ Matt G. (Mobius) (@mguthaus)**
- Message ID: `1483964549718872124`
- Author ID: `1417961928961298623`
- Nickname: Matt G. (Mobius)
- User name: mguthaus
- Type: `Default`
- Edited: 2026-03-18T23:05:42.989+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1483964549718872124
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-03/2026-03.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-03/2026-03.json
**Content**
```text
I made a Cocotb Analog-Mixed-Signal (AMS) extension in about less than an hour using Claude. It can output VCD of Verilog simulations along with real-valued signals from ngspice. Any suggestions to improve it?
https://vlsida.github.io/cocotbext-ams/
```
**Embeds**
- Resolved media URL: https://vlsida.github.io/cocotbext-ams/
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---
## message-1484200956148060240
**2026-03-19T14:44:43.066+00:00 โ Matt G. (Mobius) (@mguthaus)**
- Message ID: `1484200956148060240`
- Author ID: `1417961928961298623`
- Nickname: Matt G. (Mobius)
- User name: mguthaus
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1484200956148060240
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**Reply/reference**
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Added Xyce support but it isn't event-driven due to API limitations
```
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---
## message-1485479616000036876
**2026-03-23T03:25:39.331+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1485479616000036876`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1485479616000036876
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**Content**
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https://epub.jku.at/obvulihs/content/titleinfo/13546624/full.pdf looks kind of interesting, anyone understand it more than I do and could provide a summary / feedback / thoughts?
```
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---
## message-1485533908048154684
**2026-03-23T07:01:23.564+00:00 โ Simi (@simi150500)**
- Message ID: `1485533908048154684`
- Author ID: `210834917125390336`
- Nickname: Simi
- User name: simi150500
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1485533908048154684
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-03/2026-03.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1485479616000036876
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See here: https://youtu.be/2xSAK-mDGEY?is=s5H5dOhiioJvBlFS
```
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## message-1485534261267267714
**2026-03-23T07:02:47.778+00:00 โ Simi (@simi150500)**
- Message ID: `1485534261267267714`
- Author ID: `210834917125390336`
- Nickname: Simi
- User name: simi150500
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1485534261267267714
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**Content**
```text
Ghaith did his impressive Master's Thesis at our Integrated Circuit Design department at JKU.
I invited him to the channel for further details. ๐
```
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---
## message-1485535574634004503
**2026-03-23T07:08:00.909+00:00 โ Ghaith Al Sabagh (@ghaithalsabagh)**
- Message ID: `1485535574634004503`
- Author ID: `768095480264917023`
- Nickname: Ghaith Al Sabagh
- User name: ghaithalsabagh
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1485535574634004503
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-03/2026-03.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1485479616000036876
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Hi Tim!
I am the author ๐
At Wed I have my master exam. After that, I could provide you the information you need ๐
```
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---
## message-1488714623258464389
**2026-04-01T01:40:25.165+00:00 โ nmz787**
- Message ID: `1488714623258464389`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1488714623258464389
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
Are there instructions for linking xschem to the pdk symbol+schematic libraries and bsim models ?
```
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---
## message-1488714714660995263
**2026-04-01T01:40:46.957+00:00 โ nmz787**
- Message ID: `1488714714660995263`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1488714714660995263
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**Content**
```text
(or maybe the bsim models are more relevant to ngspice and or xyce)
```
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---
## message-1494040727989129349
**2026-04-15T18:24:27.487+00:00 โ namibj**
- Message ID: `1494040727989129349`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1494040727989129349
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1488714623258464389
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If you haven't figured it out yet I'm happy to share my setup I got a lil help from tnt on with you if you'd write it into a brief blog post like "tutorial/instructions", like this weekend.
```
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---
## message-1494045673178529923
**2026-04-15T18:44:06.512+00:00 โ namibj**
- Message ID: `1494045673178529923`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1494045673178529923
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Content**
```text
In other "topic", how high-order of a delta-sigma DAC would be reasonable to pull off for on-die bias generation?
I'd prefer to get by with a modest oversampling ratio to keep decent loop bandwidth even with the digital PLL being "limited" to CMOS logic speeds instead of the core's MCML (there's no way I finish enough of a cell library to make even just the delta sigma modulator (probably MASH?) out of MCML, before the deadline) speeds...
It'd already look at doing the fast side of the time-to-digital converter in the little amount of MCML (as that way it would at least be able to directly count quarter clocks of timing, I think...).
```
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---
## message-1494051075311800421
**2026-04-15T19:05:34.481+00:00 โ nmz787**
- Message ID: `1494051075311800421`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1494051075311800421
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I would love to... But I'm on vacation away from laptop with my setup until Monday
```
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---
## message-1494051236700356739
**2026-04-15T19:06:12.959+00:00 โ nmz787**
- Message ID: `1494051236700356739`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1494051236700356739
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Content**
```text
And no I didn't figure it out. I spent time trying to kick openAI codex to build something for me lol
```
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---
## message-1494068440695312454
**2026-04-15T20:14:34.711+00:00 โ namibj**
- Message ID: `1494068440695312454`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1494068440695312454
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1494051075311800421
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wednesday daytime berlin time should work, probably
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---
## message-1495822285607796736
**2026-04-20T16:23:43.923+00:00 โ namibj**
- Message ID: `1495822285607796736`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1495822285607796736
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**Content**
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Anyone happen to have some examples for "parametric cells" that try to do analog "buffer"/"amplifier"?
I.... _kinda_ need to quickly figure out how to automate layout-parasitics-including tuning so I can get it running. I have sufficiently-ish conquered xschem on the matter but that's ignorant of layout parasitics.
```
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---
## message-1496035164092891236
**2026-04-21T06:29:38.109+00:00 โ Buzz (@davidbuzz)**
- Message ID: `1496035164092891236`
- Author ID: `292840623634120707`
- Nickname: Buzz
- User name: davidbuzz
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496035164092891236
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**Content**
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honest Q, is a MEMS device considered analog.?
```
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---
## message-1496035974185095269
**2026-04-21T06:32:51.25+00:00 โ Buzz (@davidbuzz)**
- Message ID: `1496035974185095269`
- Author ID: `292840623634120707`
- Nickname: Buzz
- User name: davidbuzz
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496035974185095269
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**Content**
```text
I'm thinking , naturally of somethuing like a MEMS gyro or a MEMS accelerometer, eg, a ADXL213 https://www.richis-lab.de/images/ADXL213/03.jpg https://www.richis-lab.de/images/ADXL213/06.jpg https://www.richis-lab.de/images/ADXL213/07.jpg
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## message-1496036118729195550
**2026-04-21T06:33:25.712+00:00 โ Buzz (@davidbuzz)**
- Message ID: `1496036118729195550`
- Author ID: `292840623634120707`
- Nickname: Buzz
- User name: davidbuzz
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496036118729195550
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reference: https://www.eevblog.com/forum/projects/mems-nice-die-pictures/
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---
## message-1496037863257669752
**2026-04-21T06:40:21.64+00:00 โ Buzz (@davidbuzz)**
- Message ID: `1496037863257669752`
- Author ID: `292840623634120707`
- Nickname: Buzz
- User name: davidbuzz
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496037863257669752
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**Content**
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i believe 'laser ablation' of the wafer to make thru-trenches *after* its been processed like regular silicon for the electronic parts, and before packaging, is the usual process , sometimes they are back-ground to make them thinner too.
```
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## message-1496038414796062820
**2026-04-21T06:42:33.137+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1496038414796062820`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496038414796062820
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Kinda but not really. MEMS generally requires things like undercuts which are not something supported on silicon process technologies - the circuits driving / reading the MEMS structures are frequently analog ADC/DACs. If you are interested in MEMS maybe check out science.xyz - they had credit card orderable MEMS processes.
```
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---
## message-1496042660043948052
**2026-04-21T06:59:25.283+00:00 โ Buzz (@davidbuzz)**
- Message ID: `1496042660043948052`
- Author ID: `292840623634120707`
- Nickname: Buzz
- User name: davidbuzz
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496042660043948052
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**Content**
```text
https://www.analog.com/en/resources/technical-articles/accelerometer-and-gyroscopes-sensors-operation-sensing-and-applications.html
a mems gyro is usually in constant oscillation and a mems accelerometer is usually not, but they are fundamentally compatible technologies.
```
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## message-1496042852415705148
**2026-04-21T07:00:11.148+00:00 โ Buzz (@davidbuzz)**
- Message ID: `1496042852415705148`
- Author ID: `292840623634120707`
- Nickname: Buzz
- User name: davidbuzz
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496042852415705148
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```text
its basically measuring capacitance change over time
```
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## message-1496043083530506311
**2026-04-21T07:01:06.25+00:00 โ Buzz (@davidbuzz)**
- Message ID: `1496043083530506311`
- Author ID: `292840623634120707`
- Nickname: Buzz
- User name: davidbuzz
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496043083530506311
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**Content**
```text
anyway, dont mine me, ive got a thing for sensors. ๐
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---
## message-1496470324894503052
**2026-04-22T11:18:48.529+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1496470324894503052`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496470324894503052
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```text
https://science.xyz/docs/c/mems-pdk
```
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---
## message-1496749009195237486
**2026-04-23T05:46:12.044+00:00 โ Ghaith Al Sabagh (@ghaithalsabagh)**
- Message ID: `1496749009195237486`
- Author ID: `768095480264917023`
- Nickname: Ghaith Al Sabagh
- User name: ghaithalsabagh
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496749009195237486
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I am not that expert, but this one seems to be like silicon technologies.
https://science.xyz/docs/d/mems-soi/index
IHP as far as I know offers LBE (localized backside etching) too.
```
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---
## message-1496749511643631646
**2026-04-23T05:48:11.837+00:00 โ tnt (@246tnt)**
- Message ID: `1496749511643631646`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Edited: 2026-04-23T05:48:31.288+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496749511643631646
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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```text
IHP does LBE but not on the cost reduced runs, you'll have to go through their full commercial service for that.
```
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## message-1496749647358857366
**2026-04-23T05:48:44.194+00:00 โ Ghaith Al Sabagh (@ghaithalsabagh)**
- Message ID: `1496749647358857366`
- Author ID: `768095480264917023`
- Nickname: Ghaith Al Sabagh
- User name: ghaithalsabagh
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496749647358857366
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**Content**
```text
Actually it depends I think
It is wafer post-processing
```
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## message-1496749736399474821
**2026-04-23T05:49:05.423+00:00 โ Ghaith Al Sabagh (@ghaithalsabagh)**
- Message ID: `1496749736399474821`
- Author ID: `768095480264917023`
- Nickname: Ghaith Al Sabagh
- User name: ghaithalsabagh
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496749736399474821
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**Content**
```text
You can still make a normal wafer on reduced cost, then send it to LBE
```
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## message-1496749754733035560
**2026-04-23T05:49:09.794+00:00 โ Ghaith Al Sabagh (@ghaithalsabagh)**
- Message ID: `1496749754733035560`
- Author ID: `768095480264917023`
- Nickname: Ghaith Al Sabagh
- User name: ghaithalsabagh
- Type: `Default`
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**Content**
```text
I assume
```
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## message-1496749819325059123
**2026-04-23T05:49:25.194+00:00 โ tnt (@246tnt)**
- Message ID: `1496749819325059123`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496749819325059123
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**Content**
```text
No, because on reduced cost the wafer is shared ... you don't get a full wafer ๐
```
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---
## message-1496749970630381589
**2026-04-23T05:50:01.268+00:00 โ tnt (@246tnt)**
- Message ID: `1496749970630381589`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496749970630381589
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Content**
```text
Unless you can do LBE yourself on individual sliced dies.
```
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---
## message-1496750117544267808
**2026-04-23T05:50:36.295+00:00 โ tnt (@246tnt)**
- Message ID: `1496750117544267808`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496750117544267808
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**Content**
```text
And LBE not being on the cost reduced runs is what IHP themselves said because that question was asked at some point.
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---
## message-1496750641102585926
**2026-04-23T05:52:41.121+00:00 โ Ghaith Al Sabagh (@ghaithalsabagh)**
- Message ID: `1496750641102585926`
- Author ID: `768095480264917023`
- Nickname: Ghaith Al Sabagh
- User name: ghaithalsabagh
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496750641102585926
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**Content**
```text
The question is if an open-source community make a run for MEMS. Then they can share the wafer, but after LBE. What I mean is that It would be possible to handle such issue for a whole wafer after discussing with IHP. It would cost somehow more yes
```
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---
## message-1496750911119167592
**2026-04-23T05:53:45.498+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1496750911119167592`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496750911119167592
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**Content**
```text
Could you potentially get wafers.space wafers LBE? I do offer purchase of full wafers.
```
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---
## message-1496751195081932820
**2026-04-23T05:54:53.2+00:00 โ Ghaith Al Sabagh (@ghaithalsabagh)**
- Message ID: `1496751195081932820`
- Author ID: `768095480264917023`
- Nickname: Ghaith Al Sabagh
- User name: ghaithalsabagh
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1496751195081932820
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**Content**
```text
Do you offer LBE?
```
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---
## message-1496878565323575297
**2026-04-23T14:21:00.632+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1496878565323575297`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
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I do not.
```
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---
## message-1498189273004904468
**2026-04-27T05:09:17.695+00:00 โ Joaquin Matres (@joaquinmatres)**
- Message ID: `1498189273004904468`
- Author ID: `942931661094531153`
- Nickname: Joaquin Matres
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- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498189273004904468
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**Content**
```text
For MEMs we have some open source structures here
https://gdsfactory.github.io/gdsfactory/components.html#gdsfactory.components.mems.gear
@namibj For amplifiers
you can check out
https://gdsfactory.github.io/IHP/cells.html
```
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---
## message-1498369103792967750
**2026-04-27T17:03:52.696+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1498369103792967750`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498369103792967750
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
I didn't realize gdsfactory had such a wide array of pcells!
```
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## message-1498382259110285643
**2026-04-27T17:56:09.168+00:00 โ Thomas Pluck 2.1 (@tpluck_)**
- Message ID: `1498382259110285643`
- Author ID: `1331673337616793672`
- Nickname: Thomas Pluck 2.1
- User name: tpluck_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498382259110285643
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Content**
```text
So looks like Danube River is out of gas and we need someone to measure the test structures, anybody able and willing with a probe station to make it happen?
```
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---
## message-1498382510206357504
**2026-04-27T17:57:09.034+00:00 โ Thomas Pluck 2.1 (@tpluck_)**
- Message ID: `1498382510206357504`
- Author ID: `1331673337616793672`
- Nickname: Thomas Pluck 2.1
- User name: tpluck_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498382510206357504
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Content**
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https://wiki.libresilicon.com/index.php?title=Danube_River
```
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---
## message-1498382945751269578
**2026-04-27T17:58:52.876+00:00 โ Thomas Pluck 2.1 (@tpluck_)**
- Message ID: `1498382945751269578`
- Author ID: `1331673337616793672`
- Nickname: Thomas Pluck 2.1
- User name: tpluck_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498382945751269578
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Content**
```text
(unless you're some kind of corporate shill)
```
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---
## message-1498384841669087495
**2026-04-27T18:06:24.898+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1498384841669087495`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498384841669087495
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Content**
```text
*keyence enters chat*
```
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---
## message-1498391898388430848
**2026-04-27T18:34:27.351+00:00 โ Thomas Pluck 2.1 (@tpluck_)**
- Message ID: `1498391898388430848`
- Author ID: `1331673337616793672`
- Nickname: Thomas Pluck 2.1
- User name: tpluck_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498391898388430848
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Content**
```text
```
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---
## message-1498429497811402837
**2026-04-27T21:03:51.752+00:00 โ namibj**
- Message ID: `1498429497811402837`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498429497811402837
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1498384841669087495
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_looks at beloved https://www.iptest.com/ mousepad_
```
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---
## message-1498587130979549205
**2026-04-28T07:30:14.428+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1498587130979549205`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498587130979549205
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1498382259110285643
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Probably out of our price range, but CoolCAD did a bunch of the testing for the SKY130 raw data repo in conjunction with NIST.
```
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---
## message-1498764045962973215
**2026-04-28T19:13:14.247+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1498764045962973215`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498764045962973215
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1461780860943597700
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still poking at my GF180 pdk for ALIGN. starting to see light at the end of the tunnel, most (synthetic) generated designs are coming out LVS and DRC clean. Still needs some human sanity checking to make sure the schematics are what they are actually supposed to be. But from just skimming designs they are looking better than before, respecting constraints like symmetry now, etc
```
**Attachments**
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---
## message-1498764387941486753
**2026-04-28T19:14:35.781+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1498764387941486753`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498764387941486753
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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**Content**
```text
still some issues with spacing but it's a constant battle against overzealous packing and DRC violations ๐ซ
```
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---
## message-1498836736904794263
**2026-04-29T00:02:05.118+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1498836736904794263`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498836736904794263
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
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When you say ALIGN - do you mean the project that came out of the DARPA IDEA/POSH program?
```
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---
## message-1498838648894914591
**2026-04-29T00:09:40.972+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1498838648894914591`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498838648894914591
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possibly? This: https://github.com/ALIGN-analoglayout/ALIGN-public
```
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---
## message-1498839756002557952
**2026-04-29T00:14:04.927+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1498839756002557952`
- Author ID: `384390069412429834`
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- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498839756002557952
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
(yes seems to be from that DARPA IDEA/ERI "no humans in the loop" project)
```
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---
## message-1498840585736421539
**2026-04-29T00:17:22.751+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1498840585736421539`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498840585736421539
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
Yeap!
```
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---
## message-1498840816846897245
**2026-04-29T00:18:17.852+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1498840816846897245`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498840816846897245
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
@BreakingTaps - We should most certainly send GF180MCU support upstream if you get it working.
```
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---
## message-1498840931435020358
**2026-04-29T00:18:45.172+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1498840931435020358`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498840931435020358
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
@BreakingTaps - I met the people behind ALIGN a few times at the DARPA workshops.
```
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---
## message-1498867157054783529
**2026-04-29T02:02:57.847+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1498867157054783529`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498867157054783529
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
will try to tidy things up when I get everything in working order! I did make some changes to ALIGN itself which may be difficult to upstream but we can have a chat with them. There are a number of assumptions baked into how it places cells, mostly assuming you're on a finfet node. So it standardizes row height, adds dummy poly fingers after cells, stuff like that. Ended up wasting a ton of space on a big node like GF180
Loosening some of those rules then puts cells in potential corner-contact between rows, so added some constraints to the ILP solver to avoid corner touches etc etc
```
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---
## message-1498867254509572277
**2026-04-29T02:03:21.082+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1498867254509572277`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498867254509572277
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
that said, I think the GF180 PDK itself should be portable to "stock" ALIGN, it'll just be bulky
```
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---
## message-1498932033752272896
**2026-04-29T06:20:45.657+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1498932033752272896`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Edited: 2026-04-29T06:20:53.159+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1498932033752272896
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
@BreakingTaps - They have some demonstration bulk node PDKs
```
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---
## message-1499081521863069918
**2026-04-29T16:14:46.4+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1499081521863069918`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499081521863069918
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
yeah there's a sky130 in there. i haven't looked at it for a while but iirc it also had a ton of wasted space
```
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---
## message-1499085846727626863
**2026-04-29T16:31:57.528+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1499085846727626863`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Edited: 2026-04-29T16:32:26.293+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499085846727626863
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
The biggest problem was multiple dummy fingers get appended to edges of cells. The hardcoded values in ALIGN uses gateDummy=3, which adds 3.2um per cell of "wasted" poly strips per cell (multiplied by the number of x_cells the transistor is being split into). Cells are also rounded to multiples of M3 pitch (800nm) which can interact badly with the finger widths too and bulk it even more
Row heights are pinned to the tallest cell, so you can also get big empty rows despite the solver trying to minimize area.
None of it is _wrong_ per se, but it's definitely optimized for a node that has discrete diffusion/fin widths and tight gate pitches (at least from my outsider, relative newcomer ๐ )
```
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---
## message-1499087085246615663
**2026-04-29T16:36:52.814+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1499087085246615663`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499087085246615663
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
but luckily, open source! so easy enough to tweak and experiment with ๐
```
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---
## message-1499151760202141898
**2026-04-29T20:53:52.525+00:00 โ namibj**
- Message ID: `1499151760202141898`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499151760202141898
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1498764045962973215
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```text
got a schematic to go wtih that layout by chance?
```
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---
## message-1499189666786578463
**2026-04-29T23:24:30.159+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1499189666786578463`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499189666786578463
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1499151760202141898
Reference data
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**Content**
````text
Believe it was this one. Caveat that this schematic was synthetically generated and very possibly nonsensical ๐
```
* Folded Cascode OTA: W=1.32u, NF=2
.SUBCKT OTA_FOLDED_W1P32U_NF2 VSS VDD INP INN OUT VBIAS VCASN VCASP
* PMOS input differential pair
M1 N1 INP TAIL VDD pfet_03v3 w=1.32u l=280n nf=2 m=1
M2 N2 INN TAIL VDD pfet_03v3 w=1.32u l=280n nf=2 m=1
* Tail current source
M0 TAIL VBIAS VSS VSS nfet_03v3 w=2.64u l=280n nf=2 m=2
* Folded NMOS cascode
M3 N1 VCASN N3 VSS nfet_03v3 w=1.32u l=280n nf=2 m=1
M4 N2 VCASN N4 VSS nfet_03v3 w=1.32u l=280n nf=2 m=1
* NMOS current source
M9 N3 VBIAS VSS VSS nfet_03v3 w=1.32u l=280n nf=2 m=1
M10 N4 VBIAS VSS VSS nfet_03v3 w=1.32u l=280n nf=2 m=1
* PMOS cascode loads
M5 N1 VCASP N5 VDD pfet_03v3 w=1.32u l=280n nf=2 m=1
M6 N5 N5 VDD VDD pfet_03v3 w=1.32u l=280n nf=2 m=1
M7 N2 VCASP OUT VDD pfet_03v3 w=1.32u l=280n nf=2 m=1
M8 OUT N5 VDD VDD pfet_03v3 w=1.32u l=280n nf=2 m=1
.ENDS OTA_FOLDED_W1P32U_NF2
```
````
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---
## message-1499189834474848288
**2026-04-29T23:25:10.139+00:00 โ namibj**
- Message ID: `1499189834474848288`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499189834474848288
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
as long as it reasonably confidently corresponds to the layout I'm fine
```
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---
## message-1499190093137580082
**2026-04-29T23:26:11.809+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1499190093137580082`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499190093137580082
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
(there's also a constraint file that goes along with that somewhere, which specifies stuff like symmetry. would need to hunt for that when i get home)
```
Other message metadata
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---
## message-1499190122363617392
**2026-04-29T23:26:18.777+00:00 โ namibj**
- Message ID: `1499190122363617392`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499190122363617392
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
i'd happily take a "fresh" pair btw if that's easier to givew with confidence
```
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---
## message-1499190212117659669
**2026-04-29T23:26:40.176+00:00 โ namibj**
- Message ID: `1499190212117659669`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499190212117659669
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
oh I'm going to bed now, they took my teeth yesterday ๐
```
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---
## message-1499190287560347668
**2026-04-29T23:26:58.163+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1499190287560347668`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499190287560347668
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
๐ฉ oof, feel better!
```
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---
## message-1499190311224873080
**2026-04-29T23:27:03.805+00:00 โ namibj**
- Message ID: `1499190311224873080`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499190311224873080
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
thx
```
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---
## message-1499190413603635200
**2026-04-29T23:27:28.214+00:00 โ namibj**
- Message ID: `1499190413603635200`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499190413603635200
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
I'd expect to look at things now sooner than 20 hours from now fyi
```
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---
## message-1499248900446486631
**2026-04-30T03:19:52.564+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1499248900446486631`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499248900446486631
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
@BreakingTaps - IIRC The ALIGN team had outstanding success with FinFET nodes due to the very limited type of transistors that you are allowed on them and then struggled with extending it back to planar technologies.
```
**Reactions**
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---
## message-1499270078137503854
**2026-04-30T04:44:01.719+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1499270078137503854`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499270078137503854
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
ahh interesting. that makes sense, tracks with the sorts of limitations i'm seeing. on the upside, claude/codex are helping me beat back the edge cases by just throwing tons of samples at it and iterating on failures. bit tedious but making progress
```
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---
## message-1499343125955481740
**2026-04-30T09:34:17.676+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1499343125955481740`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499343125955481740
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
"bit tedious but making progress" I think describe all software development a lot of the time ๐
```
**Reactions**
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---
## message-1499411054520701009
**2026-04-30T14:04:13.108+00:00 โ Thomas Pluck 2.1 (@tpluck_)**
- Message ID: `1499411054520701009`
- Author ID: `1331673337616793672`
- Nickname: Thomas Pluck 2.1
- User name: tpluck_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499411054520701009
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1498587130979549205
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**Content**
```text
Welp, that one's dead on arrival - hope there's something left on Run 2 to get this done for real without ideological strings attached
```
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---
## message-1499416630634217522
**2026-04-30T14:26:22.557+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1499416630634217522`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499416630634217522
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
huh? ideological strings attached?
```
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---
## message-1499416656668135484
**2026-04-30T14:26:28.764+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1499416656668135484`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499416656668135484
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
feel like I'm missing a ton of context here ๐
```
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---
## message-1499427537653203035
**2026-04-30T15:09:42.993+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1499427537653203035`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499427537653203035
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
@BreakingTaps - @Thomas Pluck 2.1 was offering to figure out characterization of existing test structures taped out on the GF180MCU process technology (see https://siliconpr0n.org/archive/doku.php?id=mcmaster:efabless:gf180mcu-mpw18h1-18100001&s[]=gf180mcu) -- The idea that having some data from these structures would mean better/more advanced ones could then be created for Run #2 and allow even better understanding of the process technology. Sadly the people who currently possess the die are unwilling to share them.
```
**Reactions**
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---
## message-1499428040000798792
**2026-04-30T15:11:42.762+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1499428040000798792`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1499428040000798792
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-04/2026-04.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-04/2026-04.json
**Content**
```text
ahh, booo ๐
```
**Reactions**
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---
## message-1501422718451581018
**2026-05-06T03:17:51.164+00:00 โ Tisham Dhar (CSIRO EASI) (@tishamdhar)**
- Message ID: `1501422718451581018`
- Author ID: `746955286274900120`
- Nickname: Tisham Dhar (CSIRO EASI)
- User name: tishamdhar
- Type: `Default`
- Edited: 2026-05-06T03:18:00.159+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1501422718451581018
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
I am interested in designing a metering ASIC for energy. Design block suggestions and toolchains welcome. Looking to use Tiny Tapeout or Wafer Space given space required.
```
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---
## message-1503513753533284572
**2026-05-11T21:46:52.777+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1503513753533284572`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503513753533284572
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
world's least optimized pixel array ๐
```
**Attachments**
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---
## message-1503538749345107998
**2026-05-11T23:26:12.243+00:00 โ namibj**
- Message ID: `1503538749345107998`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503538749345107998
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1503513753533284572
Reference data
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```text
Are you doing photoelectronics for Run2/3?
```
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---
## message-1503539068967850035
**2026-05-11T23:27:28.447+00:00 โ namibj**
- Message ID: `1503539068967850035`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503539068967850035
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
(also that's why back illumination and what microlenses are for)
```
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---
## message-1503556517926928454
**2026-05-12T00:36:48.603+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1503556517926928454`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503556517926928454
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
If I can get a bit more of it done in the next week or two, yep! Would love to tape this out for Run2. it's an "event pixel" design, where each pixel fires asynchronously when its threshold is breached. They register changes in a scene rather than a clocked frame
```
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---
## message-1503560022028980345
**2026-05-12T00:50:44.046+00:00 โ namibj**
- Message ID: `1503560022028980345`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503560022028980345
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1503556517926928454
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**Content**
```text
ahhhhh.
I was about to say, at that lack of density, might almost go for SPAD (but the DRCs likely prevent the necessary field-smoothing rounding).
```
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---
## message-1503570511114932328
**2026-05-12T01:32:24.839+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1503570511114932328`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Edited: 2026-05-12T01:32:52.267+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503570511114932328
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
I should be able to get density higher, ALIGN freaked out once I added the photodiode into the circuit. Either needs some tweaks, or just pull the diode out and hand-place them. but otoh 32x32 is plenty for demonstration and it'll probably make the rest of the project easier so ๐คทโโ๏ธ ๐
```
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---
## message-1503570675137253548
**2026-05-12T01:33:03.945+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1503570675137253548`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503570675137253548
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
SPADs would be neat though!
```
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---
## message-1503570993137057924
**2026-05-12T01:34:19.762+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1503570993137057924`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503570993137057924
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
think I saw a paper somewhere with a SPAD done in skywater 130? or maybe even GF 180? will try to find it
```
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---
## message-1503587462063194203
**2026-05-12T02:39:46.26+00:00 โ namibj**
- Message ID: `1503587462063194203`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503587462063194203
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
I'm just a little sad that silicon's indirect bandgap means you can't just use a photodiode for bidirectional communications like you can with e.g. a 405nm-pumped COTS blue LED (load modulation in photovoltaic biasing severely varies how much shunt current in the diode produces electroluminescence; this is fairly easy to separate at the end with the 405nm source and can be used as a back-channel there).
Unless you happen to know some clever trick that'd allow one to do vertical surface emitting data back channel from on top of a gf180mcuD die to some "beefier" system. I mean I guess tbf things like osram/ams's `PLPVYL1 940A_E` 20~60ct/each (depending on quantity) VCSEL do exist... (wish there was a SPICE for it, or even just capacitance information, but oh well....)
```
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---
## message-1503587887407431761
**2026-05-12T02:41:27.67+00:00 โ namibj**
- Message ID: `1503587887407431761`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Edited: 2026-05-12T02:41:39.92+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503587887407431761
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
ohhh, it even hits nicely into peak Si photodiode A/W efficiency....
```
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---
## message-1503622200320725053
**2026-05-12T04:57:48.506+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1503622200320725053`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503622200320725053
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
could abuse resistive elements or even just big gates and emit IR ๐
I think porous silicon can be used to make an LED without any other materials, but it's a pretty crapp LED iirc (and far red)
```
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---
## message-1503622825632731157
**2026-05-12T05:00:17.592+00:00 โ namibj**
- Message ID: `1503622825632731157`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1503622825632731157
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1503622200320725053
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```text
tho apparently you can just buy VCSEL for so cheap if you buy ones marketed to lower power IR illumination; I should get one next time and try to measure capacitance.
```
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---
## message-1504576302739488798
**2026-05-14T20:09:04.249+00:00 โ nmz787**
- Message ID: `1504576302739488798`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1504576302739488798
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
AnalogCoder: Analog Circuit Design via Training-Free Code Generation
https://arxiv.org/pdf/2405.14918
LADAC: Large Language Model-driven Auto-Designer for Analog Circuits
https://www.techrxiv.org/doi/full/10.36227/techrxiv.170473941.10097233/v1
Tutorial and Perspectives on MAGICAL: A Silicon-Proven Open-Source Analog IC Layout System
https://par.nsf.gov/servlets/purl/10356326
```
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---
## message-1504576338089218229
**2026-05-14T20:09:12.677+00:00 โ nmz787**
- Message ID: `1504576338089218229`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1504576338089218229
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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```text
@BreakingTaps ^
```
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---
## message-1504576360075628776
**2026-05-14T20:09:17.919+00:00 โ nmz787**
- Message ID: `1504576360075628776`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1504576360075628776
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
ever come across them?
```
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---
## message-1504576802381893773
**2026-05-14T20:11:03.373+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1504576802381893773`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1504576802381893773
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
I've seen MAGICAL before! MAGICAL and ALIGN were both funded by the same DARPA program and were sort of sibling projects. After looking over them, it seemed that MAGICAL is abandoned/not-very-active and looked harder to extend to other PDKs (the paper or project had a note about how it was difficult to port).
Dunno about the other two, will take a look!
```
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---
## message-1506005315886252055
**2026-05-18T18:47:27.533+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1506005315886252055`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
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- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506005315886252055
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Stupid idea, but could the metal layers be used as reflectors and/or diffraction gratings/etc ?
```
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---
## message-1506005576122110127
**2026-05-18T18:48:29.578+00:00 โ namibj**
- Message ID: `1506005576122110127`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506005576122110127
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
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```text
sure, kinda static tho
```
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## message-1506005662851793086
**2026-05-18T18:48:50.256+00:00 โ namibj**
- Message ID: `1506005662851793086`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506005662851793086
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**Content**
```text
and I at least don't know how good the absolute scale tolerance of the litho is
```
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---
## message-1506011145327349982
**2026-05-18T19:10:37.38+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1506011145327349982`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506011145327349982
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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```text
I was actually looking into using the metal lines as gratings / structural color recently. Unfortunately the min pitch is pretty large. M1 could get you some mid-visible color, but M2+ is all pretty far red. ๐
I wonder if you could throw a resistive element under a metal reflector layer and use the thermal expansion though? be sort of like a deformable mirror but fully monolithic ๐ค
```
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---
## message-1506011380996771951
**2026-05-18T19:11:33.568+00:00 โ namibj**
- Message ID: `1506011380996771951`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506011380996771951
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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```text
Just don't do what tholin seems to have accidentally done (crack dies after first power cycle)
```
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---
## message-1506011476589150268
**2026-05-18T19:11:56.359+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1506011476589150268`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506011476589150268
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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That is why you get 1,000 of them ๐
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---
## message-1506011580851159090
**2026-05-18T19:12:21.217+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1506011580851159090`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506011580851159090
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Could you use some type of pattern between the layers or something?
```
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---
## message-1506011768730943558
**2026-05-18T19:13:06.011+00:00 โ namibj**
- Message ID: `1506011768730943558`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506011768730943558
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**Content**
```text
I'd guess the silicon could be modulated in transparency via presence of minority carriers, for some wavelength at least?
```
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## message-1506011972599283883
**2026-05-18T19:13:54.617+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1506011972599283883`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Edited: 2026-05-18T19:14:17.909+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506011972599283883
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
quite possibly! afraid that's approaching the end of my photonics knowledge. probably easy enough to simulate though
```
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---
## message-1506012123455684811
**2026-05-18T19:14:30.584+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1506012123455684811`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506012123455684811
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The simulation itself might be an interesting video? ๐
```
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---
## message-1506014422156710058
**2026-05-18T19:23:38.637+00:00 โ namibj**
- Message ID: `1506014422156710058`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506014422156710058
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```text
ahhh yeah internet says _Free-Carrier Plasma Dispersion Effect_
```
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---
## message-1506014631968243773
**2026-05-18T19:24:28.66+00:00 โ namibj**
- Message ID: `1506014631968243773`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506014631968243773
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```text
modulate refractive index usable on 1310/1550 nm light in silicon photonics waveguides.
```
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---
## message-1506014830111359097
**2026-05-18T19:25:15.901+00:00 โ namibj**
- Message ID: `1506014830111359097`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506014830111359097
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```text
just have a pn/pin junction and either reverse bias the former to desired width of depletion zone or forward bias the latter to desired minority carrier density
```
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---
## message-1506017568547405864
**2026-05-18T19:36:08.795+00:00 โ namibj**
- Message ID: `1506017568547405864`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506017568547405864
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**Content**
```text
as silicon should be pretty transparent there normally, it might work having it be in the resonator and to use it to minutely shift the resonance peak to doa little FM modulation
```
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---
## message-1506033023378919550
**2026-05-18T20:37:33.514+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1506033023378919550`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506033023378919550
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```text
heh ran some numbers on this, _very roughly_ you could get 5-10nm of vertical displacement so 10-20nm of reflected displacement. Not nothing!
```
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---
## message-1506034020490674388
**2026-05-18T20:41:31.244+00:00 โ namibj**
- Message ID: `1506034020490674388`
- Author ID: `262706220073222144`
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- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506034020490674388
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- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
consider comparing to carrier density effects in vertical transmission perhaps for the iirc fairly accessible 1310nm
```
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---
## message-1506329070714228887
**2026-05-19T16:13:56.699+00:00 โ Matt Venn (@mattvenn)**
- Message ID: `1506329070714228887`
- Author ID: `492702620759228416`
- Nickname: Matt Venn
- User name: mattvenn
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506329070714228887
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1506011145327349982
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```text
or use multiple metal layers with offsets?
```
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---
## message-1506628278708998382
**2026-05-20T12:02:53.444+00:00 โ Tholin (@tholin)**
- Message ID: `1506628278708998382`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506628278708998382
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
Muuuuch better!
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05_media/image-B32AB.png
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---
## message-1506628714987782297
**2026-05-20T12:04:37.461+00:00 โ Tholin (@tholin)**
- Message ID: `1506628714987782297`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506628714987782297
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
And can still drive a 1K load
```
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---
## message-1506628918122385509
**2026-05-20T12:05:25.892+00:00 โ Tholin (@tholin)**
- Message ID: `1506628918122385509`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506628918122385509
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Content**
```text
Yes, I could still make it use less current by optimizing it to drive smaller loads, but this is a nice tradeoff
```
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---
## message-1506628957087469622
**2026-05-20T12:05:35.182+00:00 โ Tholin (@tholin)**
- Message ID: `1506628957087469622`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506628957087469622
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
My next chip is only going to have 2 of these anyways
```
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---
## message-1506830460804923432
**2026-05-21T01:26:17.412+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1506830460804923432`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1506830460804923432
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
@Tholin - Invest in power gating anyway ๐
```
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---
## message-1507866967300772072
**2026-05-23T22:04:59.818+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1507866967300772072`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Edited: 2026-05-23T22:07:22.267+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1507866967300772072
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
Welp, defeated by DRC again ๐
working on a 1T pixel design based off of this paper (https://www.mdpi.com/1424-8220/9/1/131). Needs a floating P body which I figured you could build with DNWell -> LVPWell -> NPlus. Got everything dialed into minimum size that would make DRC happy, then arrayed it and discovered another DRC rule: LVPWell to LVPWell must be >1.4um. There goes my pixel density! ๐
Should still work, but I was hoping for <2-3um pitch so I could play with sub-diffraction limit oversampling stuff. But with that DRC limitation might as well make the active area larger and run it as a normal detector.
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05_media/sensors-09-00131f8-FBF72.png
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---
## message-1507867581388816414
**2026-05-23T22:07:26.228+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1507867581388816414`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Edited: 2026-05-23T22:07:32.019+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1507867581388816414
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
better screenshot
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05_media/image-0CD69.png
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---
## message-1507924020727644190
**2026-05-24T01:51:42.415+00:00 โ namibj**
- Message ID: `1507924020727644190`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1507924020727644190
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1507866967300772072
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**Content**
```text
Can't you use pmos devices instead and not need the dnwell?
Also I still don't quite get where and how STI is litho'd. Like, what patterns/shapes even do that?
Also, https://gf180mcu-pdk.readthedocs.io/en/latest/physical_verification/design_manual/drm_07_04.html says:
> Equi potential min space 0.86V
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05_media/image-48382.png
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---
## message-1507925277055914146
**2026-05-24T01:56:41.947+00:00 โ namibj**
- Message ID: `1507925277055914146`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1507925277055914146
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
Also maybe look at https://gf180mcu-pdk.readthedocs.io/en/latest/physical_verification/design_manual/drm_10_07.html it feels like you may be doing things similar to those restrictions depending on biasing conditions?
```
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---
## message-1508120352901959830
**2026-05-24T14:51:51.653+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1508120352901959830`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508120352901959830
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Content**
```text
Hmm I'll need to double check, but I don't think a normal pmos device would give the floating p-body that's needed. It'd be an nwell in the psub, and then p+ contacts
```
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---
## message-1508120558665990296
**2026-05-24T14:52:40.711+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1508120558665990296`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508120558665990296
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Content**
```text
need to look into that equipotential thing, not sure how it's calculated. Would be great to use that spacing! I think because all the floating p-body sections are isolated, they are considered at different potentials by the DRC? not sure
```
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---
## message-1508133206363471964
**2026-05-24T15:42:56.157+00:00 โ namibj**
- Message ID: `1508133206363471964`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508133206363471964
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508120352901959830
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```text
No I mean like, the photodiode works regardless of whether it's illuminated from the P-side or the N-side, right?
Voltages flip, sure, but I'd not think you'd need particularly high performance transistor channels in those pixels so that's not on it's own at least reason to go for N-channel device.
```
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---
## message-1508134661497290783
**2026-05-24T15:48:43.088+00:00 โ namibj**
- Message ID: `1508134661497290783`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508134661497290783
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508120558665990296
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**Content**
```text
Well I'm pretty sure it's (only) a latchup concern; I'd guess this might cause charge-spillover to adjacent cells similar in visual effect to what we remember from old CCD digital cameras.
Xyce has 2D TCAD on hand you could use to model the latchup behavior.
I guess the biggest hurdle would be that it's potentially gonna blow the 4-electrode limit in their code.
```
**Reactions**
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---
## message-1508135040695926846
**2026-05-24T15:50:13.496+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1508135040695926846`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508135040695926846
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
Ah I misunderstood. Yes, N or P is fine, although P is preferred because hole accumulation is (apparently) better for imaging. less noisy I think?
But the main thing is that it needs a floating/isolated body of the diode. Light passes through the poly gate, creates electron/hole pairs, the electrons are swept away to drain and the holes remain which then alters the IV curve of the transistor when it is read out. That's how they get a "3T" pixel with one transistor, it acts as integration, readout and reset all in one. But needs the floating/isolated body to do it
```
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---
## message-1508135227438923879
**2026-05-24T15:50:58.019+00:00 โ namibj**
- Message ID: `1508135227438923879`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508135227438923879
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
1 source, 2 gate, 3 drain, 4 substrate, (maybe 5 next_drain), 5 next_gate, 6 next_source
```
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---
## message-1508135436923568261
**2026-05-24T15:51:47.964+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1508135436923568261`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508135436923568261
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508134661497290783
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```text
I was a little confused why it was codified in DRC, it seems like a functional problem but not really a design rule / layout issue ๐
```
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---
## message-1508136863909675140
**2026-05-24T15:57:28.184+00:00 โ namibj**
- Message ID: `1508136863909675140`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508136863909675140
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
> One should notice that in readout mode, some stored holes are displaced under the source due to shrink of charge storage region under the gate and source potential lowering. This shift of the charge storage region to the source and toward the pixel edge should be stopped to avoid electrical crosstalk. One solution to the problem is to employ STI (shallow trench isolation), as shown in Figure 2. It was adopted in our first design configuration.
Yeah I for one don't quite get where the electrodes are in Fig.2 ๐
Have you considered asking those researchers?
```
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---
## message-1508137149160230972
**2026-05-24T15:58:36.193+00:00 โ namibj**
- Message ID: `1508137149160230972`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508137149160230972
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508135436923568261
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```text
Me when I look at one too many sky130 DRC's again and go _huh...._
```
**Reactions**
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---
## message-1508137259025694730
**2026-05-24T15:59:02.387+00:00 โ namibj**
- Message ID: `1508137259025694730`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508137259025694730
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
[insert villager sound effect]
```
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---
## message-1508137372318044361
**2026-05-24T15:59:29.398+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1508137372318044361`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508137372318044361
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**Content**
```text
might give them a ping! can't hurt
```
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---
## message-1508137475355443462
**2026-05-24T15:59:53.964+00:00 โ namibj**
- Message ID: `1508137475355443462`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508137475355443462
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**Content**
```text
worst case they don't answer
```
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---
## message-1508137560617123952
**2026-05-24T16:00:14.292+00:00 โ namibj**
- Message ID: `1508137560617123952`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508137560617123952
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**Content**
```text
well, worst worst case they snipe your slot on Run2 ๐
```
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---
## message-1508260092594622636
**2026-05-25T00:07:08.192+00:00 โ nmz787**
- Message ID: `1508260092594622636`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508260092594622636
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Reply/reference**
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```text
At work we definitely have some DRs that are just for electrical "dummyproofing", and since my team draws mechanical and litho designs, we often get waivers for some of those rules
```
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---
## message-1508260383562006538
**2026-05-25T00:08:17.564+00:00 โ nmz787**
- Message ID: `1508260383562006538`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508260383562006538
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**Content**
```text
However we also can ask the process integration owners and ask questions like "how does the STI actually get patterned" if we're confused or just curious
```
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---
## message-1508260600273436876
**2026-05-25T00:09:09.232+00:00 โ nmz787**
- Message ID: `1508260600273436876`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508260600273436876
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```text
I need that GDS3D isometric view
```
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---
## message-1508260751381630976
**2026-05-25T00:09:45.259+00:00 โ nmz787**
- Message ID: `1508260751381630976`
- Author ID: `376976238528692225`
- Nickname: nmz787
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- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508260751381630976
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**Content**
```text
After 5 years drawing OASIS/GDS... I still get confused over all these layers on top of layers
```
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---
## message-1508260961054884001
**2026-05-25T00:10:35.249+00:00 โ namibj**
- Message ID: `1508260961054884001`
- Author ID: `262706220073222144`
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- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508260600273436876
Reference data
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**Content**
```text
same sadly KLayout PDK only has that for sky130A (and maybe ihp I don't know), not gf180mcuD ๐
```
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---
## message-1508261057469091892
**2026-05-25T00:10:58.236+00:00 โ nmz787**
- Message ID: `1508261057469091892`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508261057469091892
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
It's easy (ish) to make a layerstack
```
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---
## message-1508261492829589625
**2026-05-25T00:12:42.034+00:00 โ nmz787**
- Message ID: `1508261492829589625`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508261492829589625
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
I should really publish my layerstack generator helper... basically just a CLI that takes the list of layers, already arranged in order in a text file, and asks you what Z and how thick you want it... And accumulates your overall height to the next Z default entry (in case you have two layers at the same Z, like the diffusions)
```
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---
## message-1508261735180669001
**2026-05-25T00:13:39.815+00:00 โ nmz787**
- Message ID: `1508261735180669001`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508261735180669001
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
Although I'm sure pointing AI at the existing gds3d layerstacks as examples and asking it to generate the helper I just said, would do it in one or two prompts
```
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---
## message-1508261977821286470
**2026-05-25T00:14:37.665+00:00 โ nmz787**
- Message ID: `1508261977821286470`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508261977821286470
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
I believe I already have a gf180 prop file for gds3d, but am not on my PC right now
```
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---
## message-1508262778291621909
**2026-05-25T00:17:48.512+00:00 โ namibj**
- Message ID: `1508262778291621909`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508262778291621909
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508261735180669001
Reference data
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**Content**
```text
feed it the https://gf180mcu-pdk.readthedocs.io/en/latest/analog/layout/inter_specs/inter_specs_3_30.html and https://gf180mcu-pdk.readthedocs.io/en/latest/analog/layout/inter_specs/inter_specs_3_30.html
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05_media/2_cross_section_30-4B9DD.png
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05_media/image-02803.png
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---
## message-1508263875508834374
**2026-05-25T00:22:10.109+00:00 โ nmz787**
- Message ID: `1508263875508834374`
- Author ID: `376976238528692225`
- Nickname: nmz787
- User name: nmz787
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508263875508834374
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508262778291621909
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**Content**
```text
Need the dl;dt too, I think there's a layermap for klayout that I'd start with, but those images would be good to finish the details!
```
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---
## message-1508264052260868240
**2026-05-25T00:22:52.25+00:00 โ namibj**
- Message ID: `1508264052260868240`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508264052260868240
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508263875508834374
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```text
Sure
```
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---
## message-1508768433511071826
**2026-05-26T09:47:06.111+00:00 โ tnt (@246tnt)**
- Message ID: `1508768433511071826`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508768433511071826
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
https://discord.com/channels/1009193568256135208/1015911926053740544/1508755468275814470
```
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---
## message-1508768536435101796
**2026-05-26T09:47:30.65+00:00 โ tnt (@246tnt)**
- Message ID: `1508768536435101796`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508768536435101796
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
TT will be running an experimental slot in run2 for analog designs. See above for details.
```
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---
## message-1508825467334033409
**2026-05-26T13:33:44.034+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1508825467334033409`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508825467334033409
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508262778291621909
Reference data
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**Content**
```text
KLayout has some type of cross-sectioning mode - https://klayoutmatthias.github.io/xsection/
```
**Embeds**
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---
## message-1508925728983351426
**2026-05-26T20:12:08.274+00:00 โ namibj**
- Message ID: `1508925728983351426`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508925728983351426
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
https://gf180mcu-pdk.readthedocs.io/en/latest/physical_verification/design_manual/drm_10_05.html
I think I'm doing everything right, taking a `nmos_06v6_nvt` PCell that I confirm next to the DUT extracts just fine through magic, and _deleting just the dualgate layer rectangle_ on the DUT copy of the (all flattened) PCell structure, but magic doesn't spell complaints and the DUT just won't spawn in the extracted SPICE?
I also have a tiny `nmos_03v3` and I just confirmed that deleting also the NAT box on the DUT makes it extract as the plain `nmos_03v3` it's then expected to extract as.
Do we or do we not have those available at the GDS level?
I can understand (with much unhappyness) if there's no design support (LVS, other extraction, spice, xschem, etc.), but otherwise I'd quite very like to know where I would have been supposed to read about us explicitly not having `nmos_03v3_nvt`.
```
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---
## message-1508935131266682941
**2026-05-26T20:49:29.953+00:00 โ bailey (@bailey8889)**
- Message ID: `1508935131266682941`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508935131266682941
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508925728983351426
Reference data
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**Content**
```text
Maybe `grep _nvt $PDK_ROOT/gf180mcu/libs.tech/ngspice/*`
```
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---
## message-1508938134195404958
**2026-05-26T21:01:25.907+00:00 โ tnt (@246tnt)**
- Message ID: `1508938134195404958`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508938134195404958
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
I guess you can tape one out and measure it and see if it actually works.
```
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---
## message-1508938534185205850
**2026-05-26T21:03:01.272+00:00 โ namibj**
- Message ID: `1508938534185205850`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508938534185205850
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508938134195404958
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```text
That's my fallback.
```
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---
## message-1508983039957401771
**2026-05-26T23:59:52.275+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1508983039957401771`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508983039957401771
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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I *believe* the GDSFactory people are hoping to do some test circuits to do some verification circuits.
```
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---
## message-1508983529722351656
**2026-05-27T00:01:49.044+00:00 โ namibj**
- Message ID: `1508983529722351656`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1508983529722351656
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
@Thomas Pluck 2.1 `nfet_03v3_nvt` misses models and currently even extraction; it's only implied from some DRCs to exist. Etest if any of that happens would be _awesome_ to capture.
```
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---
## message-1509140666956120154
**2026-05-27T10:26:13.48+00:00 โ namibj**
- Message ID: `1509140666956120154`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1509140666956120154
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508983529722351656
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```text
Oh and if anyone etests that one, don't only do L=1.8, go down towards the L=0.28.
```
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---
## message-1509202645691138121
**2026-05-27T14:32:30.362+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1509202645691138121`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `ThreadCreated`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1509202645691138121
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Started a thread.
```
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---
## message-1509228331281813665
**2026-05-27T16:14:34.284+00:00 โ Thomas Pluck 2.1 (@tpluck_)**
- Message ID: `1509228331281813665`
- Author ID: `1331673337616793672`
- Nickname: Thomas Pluck 2.1
- User name: tpluck_
- Type: `Reply`
- Edited: 2026-05-27T16:16:40.493+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1509228331281813665
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1508983039957401771
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Plan was that we can generate test structures on a left over Run 2 half slot right?
```
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---
## message-1509229152761417888
**2026-05-27T16:17:50.14+00:00 โ Thomas Pluck 2.1 (@tpluck_)**
- Message ID: `1509229152761417888`
- Author ID: `1331673337616793672`
- Nickname: Thomas Pluck 2.1
- User name: tpluck_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1509229152761417888
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**Content**
```text
No sense wasting a creative TT slot on device characterization.
```
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---
## message-1509286622796058817
**2026-05-27T20:06:12.064+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1509286622796058817`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1509286622796058817
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1509228331281813665
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Correct!
```
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---
## message-1510078451703480472
**2026-05-30T00:32:38.787+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1510078451703480472`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Edited: 2026-05-30T05:58:03.615+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510078451703480472
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
@BreakingTaps - You might find https://docs.google.com/presentation/d/e/2PACX-1vS2jJzvahcR7M6YPl6omPSDk7ZW6sFhqpsh4mxRzwc5JhHkUPudI62qpevA1WWu2g/pub?start=false&loop=false&delayms=3000 interesting.
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"description": "IEEE-SSCS Chipathon 2026 Track D: AI/LLM-assisted circuits gLayout Design Walkthrough Presented by: Anhang Li (anhangli@umich.edu) Track Leads: Mehdi Saligane, Saptarshi Ghosh, Osama Khan, Trio Adiono/Nur, Mauricio Montanares, Muhammed Luqman Jukaku, Luighi Viton 1",
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---
## message-1510126061336399902
**2026-05-30T03:41:49.808+00:00 โ Andrew Wingate (@anfroholic)**
- Message ID: `1510126061336399902`
- Author ID: `756011607603019777`
- Nickname: Andrew Wingate
- User name: anfroholic
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510126061336399902
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Reply/reference**
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That's a private repo
```
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---
## message-1510160444483174561
**2026-05-30T05:58:27.389+00:00 โ Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1510160444483174561`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510160444483174561
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Reply/reference**
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```text
I think that fixes it?
```
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---
## message-1510160697290653897
**2026-05-30T05:59:27.663+00:00 โ Andrew Wingate (@anfroholic)**
- Message ID: `1510160697290653897`
- Author ID: `756011607603019777`
- Nickname: Andrew Wingate
- User name: anfroholic
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510160697290653897
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Reply/reference**
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Yes, fixed
```
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---
## message-1510338684510146622
**2026-05-30T17:46:43.123+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1510338684510146622`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510338684510146622
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
ooh neat, thanks for the ping!
```
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---
## message-1510356928310546563
**2026-05-30T18:59:12.784+00:00 โ namibj**
- Message ID: `1510356928310546563`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510356928310546563
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
Oh yes thanks for the link.
If anyone has a link to how that LLM assitance there happens to be practically usable, I'd appreciate to see if it appers to be effective for my MCML efforts that way.
```
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---
## message-1510747067734036540
**2026-05-31T20:49:29.271+00:00 โ tnt (@246tnt)**
- Message ID: `1510747067734036540`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510747067734036540
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
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**Content**
```text
I need a quick&dirty current reference. Nominal would be 30 uA at 3.3V but should be usable at 5V and acceptable range would be 20~60 uA. Anyone got something easy to propose ? ๐
```
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"id": "",
"imageUrl": "2026-05_media/1f605-42B43.svg",
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"name": "๐
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---
## message-1510766238761095271
**2026-05-31T22:05:40+00:00 โ Dory (@dorythecat_v2)**
- Message ID: `1510766238761095271`
- Author ID: `1447738536638943333`
- Nickname: Dory
- User name: dorythecat_v2
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510766238761095271
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05_media/A-circuit-diagram-showing-a-transistor-act-EFF5C.png
Attachments data
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---
## message-1510766407187562676
**2026-05-31T22:06:20.156+00:00 โ Dory (@dorythecat_v2)**
- Message ID: `1510766407187562676`
- Author ID: `1447738536638943333`
- Nickname: Dory
- User name: dorythecat_v2
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510766407187562676
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
ive used this circuit before and on a punch it's good enough
```
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---
## message-1510766492013297675
**2026-05-31T22:06:40.38+00:00 โ Dory (@dorythecat_v2)**
- Message ID: `1510766492013297675`
- Author ID: `1447738536638943333`
- Nickname: Dory
- User name: dorythecat_v2
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510766492013297675
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
otherwise, a high enough voltage and a high enough resistor should work
```
Other message metadata
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---
## message-1510766605993246720
**2026-05-31T22:07:07.555+00:00 โ tnt (@246tnt)**
- Message ID: `1510766605993246720`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510766605993246720
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Content**
```text
I meant an on-chip reference ... you can't make zener in gf180mcu
```
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---
## message-1510781231346749555
**2026-05-31T23:05:14.511+00:00 โ Thomas Dexter (@tdextrous)**
- Message ID: `1510781231346749555`
- Author ID: `661042976646103116`
- Nickname: Thomas Dexter
- User name: tdextrous
- Type: `ThreadCreated`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510781231346749555
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-05/2026-05.json
**Reply/reference**
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**Content**
```text
Started a thread.
```
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---
## message-1510896491609325598
**2026-06-01T06:43:14.699+00:00 โ Dory (@dorythecat_v2)**
- Message ID: `1510896491609325598`
- Author ID: `1447738536638943333`
- Nickname: Dory
- User name: dorythecat_v2
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510896491609325598
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
Ah sorry I'm dumb then ๐ญ
```
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---
## message-1510896575948394627
**2026-06-01T06:43:34.807+00:00 โ Dory (@dorythecat_v2)**
- Message ID: `1510896575948394627`
- Author ID: `1447738536638943333`
- Nickname: Dory
- User name: dorythecat_v2
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510896575948394627
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
Though you could probably still try with a double transistor constant current source
```
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---
## message-1510896621485948938
**2026-06-01T06:43:45.664+00:00 โ Dory (@dorythecat_v2)**
- Message ID: `1510896621485948938`
- Author ID: `1447738536638943333`
- Nickname: Dory
- User name: dorythecat_v2
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1510896621485948938
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
I don't have any schematics available rn but they shouldn't be hard to find
```
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---
## message-1511832215779151912
**2026-06-03T20:41:28.726+00:00 โ namibj**
- Message ID: `1511832215779151912`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1511832215779151912
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
We don't by chance have any decent inductors let alone mutual ones available, I guess?
I'd hope to use some gain peaking on the clock buffers, they aren't _that_ sensitive to precise inductor performance and honestly need so much parasitic resistance anyways that they can have fairly terrible Q so long as they are still very inductive (not capacitive) at the peak operating frequency.
I think I'd mostly want them to sustain higher fan-out than what I'd be having sufficient-margin-above-unity gain with at whatever frequency I can squeeze out of the latches feeding MUX2's feeding the output buffers (final latch stage clocked at half the output bit rate, just like the output MUX2 that converts from 2 parallel SDR streams to the final singular DDR (NRZ) stream).
And possibly even not using a latch on the full clock but rather a 4:1 MUX tree with selective clock phasing on the 3 involved selector bits and the 4 latches feeding directly into the input muxes.
I'll try to get a basic (inductor-free) setup going in the coming hours to figure out if 10 Gbit/s is just wishful thinking or just an issue of thermal density/chip-cooling.
fT of 25GHz at feasible drain current and low-frequency gain sounds like a mere 5 GHz fundamental with desire for clipping to be more square wave than sine wave shouldn't be _that_ bad to handle, that sounds like FO2~FO3 territory after basic parasitics...
Sure it's _intense_ but in theory only a DIV2 and a MUX2 have to be driven at the full speed from the VCO and the MUX2's output has to go to an output buffer.
```
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---
## message-1511879419852226701
**2026-06-03T23:49:03.054+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1511879419852226701`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1511879419852226701
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
I don't think I've seen anyone post an inductor layout yet. Would probably have to DIY one with GDSFactory's spiral loop generator or something? And then sim it to see how works ๐
```
Other message metadata
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---
## message-1511883505611571260
**2026-06-04T00:05:17.175+00:00 โ namibj**
- Message ID: `1511883505611571260`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1511883505611571260
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1511879419852226701
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```text
Yeah that fasthenry script https://github.com/diadatp/sky130_rf_tools/blob/main/fasthenry/iterate_fh.py should port decently to gf180mcuD, but that's half-finished work (like, for sky130) and not particularly what I quite have time to work on in these rather limited days until the ttgf0p3 deadline.
```
**Embeds**
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---
## message-1512068246294233088
**2026-06-04T12:19:22.786+00:00 โ namibj**
- Message ID: `1512068246294233088`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1512068246294233088
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
Now that I've done some _Gain-Bandwidth Product_ maths I _really_ want some T-coil's for bandwidth enhancement.
I low key have trouble believing these numbers, for that they suggest it's _technically possible_ to yeet a lane of `25GBASE-KR-S` out of a wafer.space die without necessarily melting said die as long as one ensures good cooling.
Without effective inductive peaking it's gonna involve rather lifetime-limiting hot carrier injection conditions, though, as the `nfet_3v3_dss` probably won't quite reach enough native GBW.
Yes I'm aware that prospect sounds kinda ridiculous.
I'm just getting the numbers/down-clocking-support cooked a little more before I go see how to get anywhere close to the abstract numbers I've been looking at since last night.
Even if that's too much it does suggest `10GBASE-KR` to be actually quite realistic to pull off (even post-layout).
```
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---
## message-1512185477166534677
**2026-06-04T20:05:12.804+00:00 โ namibj**
- Message ID: `1512185477166534677`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1512185477166534677
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1512068246294233088
Reference data
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**Content**
```text
Ok welp I'm not attempting a C4 serializer, yet without C4 (i.e., mere C2), 25GBASE-KR-S would probably risk melting the gf180mcuD die.
Does not seem impossible though...
Might need flip chip though due to severe high frequency impedance of the bond wire.
10GBASE-KR with "only" a C2 architecture looks worryingly "easy" (decent limiting amplifier GBW, no peaking inductors needed, C2 doesn't need any ultra-fast 4:1 MUX unlike C4 (they're tricky to correctly common-mode bias), and overall it might not need _any_ bandwidth extension trickery to function.)....
Hopefully I can be productive Saturday and do some trial layouting for the critical blocks of concern.
```
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---
## message-1512430287647412295
**2026-06-05T12:18:00.171+00:00 โ RebelMike (@rebelmike)**
- Message ID: `1512430287647412295`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1512430287647412295
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
Does anyone have a PLL thatโs in a state I might be able to use it in my design?
The goal would be to drive HDMI output so Iโd want to generate a 126MHz clock.
Iโm going to have an option to bring that clock in externally, but it would preferable to be able to run without such a fast external clock.
```
Other message metadata
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---
## message-1512470734847348797
**2026-06-05T14:58:43.535+00:00 โ dmv (@.dmv)**
- Message ID: `1512470734847348797`
- Author ID: `356185479911047169`
- Nickname: dmv
- User name: .dmv
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1512470734847348797
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1512430287647412295
Reference data
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**Content**
```text
Looks like there was a PLL in the ISHI-KAI run1 design.
https://github.com/ishi-kai/ISHI-KAI_Multiple_Projects_WaferSapce-GF180-1#PLL
Although it went 8 MHz in -> 48/40MHz out, and unclear if the die has been probed yet.
```
**Embeds**
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Embeds data
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---
## message-1512472936618004591
**2026-06-05T15:07:28.478+00:00 โ RebelMike (@rebelmike)**
- Message ID: `1512472936618004591`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1512472936618004591
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1512470734847348797
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Good find, thanks for the link!
```
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---
## message-1513184279360700416
**2026-06-07T14:14:05.804+00:00 โ namibj**
- Message ID: `1513184279360700416`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513184279360700416
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1512430287647412295
Reference data
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```text
Not for Run2; but I plan to have something who's core is silicon validated for Run3.
Provided my health can get in line today so I can at least get basic core parts drawn today.
An amplifier, a partial positive feedback delay cell for the VCO, and a very fast MUX2.
Thanks by the way for giving me a clear purpose of what people might reasonably do with the fast TX I'm working on: digital video out.
That works TX only with less than 10Gbit/s for general homelab hardware.
```
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---
## message-1513186540375900291
**2026-06-07T14:23:04.872+00:00 โ namibj**
- Message ID: `1513186540375900291`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513186540375900291
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
That said, if I manage to get the PBRS hooked up I'd have a few days after the ttgf0p3 deadline to help you hook the serializer design up to your date source, at probably 32 bit wide (3v3 SCL) per clock.
I'd think a TDMS encoder shouldn't be that hard, and it should be easy to make 4 copies of it fed from a single shared VCO.
It'd be 4 control current signals plus a differential pin pair for each line.
But those could use the ttgf analog MUX.
PLL action would have to be done off-chip by adjusting the tail current for the VCO.
```
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---
## message-1513193511548227644
**2026-06-07T14:50:46.929+00:00 โ RebelMike (@rebelmike)**
- Message ID: `1513193511548227644`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513193511548227644
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1513186540375900291
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**Content**
```text
Interesting. I just finished using up all the pins on the quarter slot ๐ But potentially I could free some back up.
Serialization wise I'm using https://github.com/Wren6991/SmolDVI, and have a super simple stateless TMDS encoder that is only capable of 2bpp on each channel, which is enough for now, and the 8 pins can instead be used for 2bpp/colour VGA output (TT VGA Pmod compatible) if HDMI is not selected (also gives me a fallback if HDMI doesn't work).
```
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---
## message-1513193875488116970
**2026-06-07T14:52:13.699+00:00 โ namibj**
- Message ID: `1513193875488116970`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513193875488116970
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1513193511548227644
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```text
honestly for Run3 I'd suggest to aim for a lane of DP; by then there's decent chance all the biasing for my serializer could live on-die, too.
```
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---
## message-1513194969718853853
**2026-06-07T14:56:34.584+00:00 โ namibj**
- Message ID: `1513194969718853853`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513194969718853853
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**Content**
```text
notably by then I should have managed to get at least a few taps of TX FIR EQ working.
```
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---
## message-1513198205255291032
**2026-06-07T15:09:25.996+00:00 โ RebelMike (@rebelmike)**
- Message ID: `1513198205255291032`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513198205255291032
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
DP would be cool! I'll probably keep things simple for run 2 and then see if there's interest in putting something DP or faster HDMI together for a later run.
```
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---
## message-1513202066657644745
**2026-06-07T15:24:46.626+00:00 โ namibj**
- Message ID: `1513202066657644745`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513202066657644745
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1513198205255291032
Reference data
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```text
Yeah I'm decently confident in the TX being good enough for it; I don't see myself being able to supply the encoder though.
I do have decent hope for DP 1.3's HBR3 though, but probably not with anywhere near full cable length in practice.
That is 30 fps per lane at 3840x2160, though....
If we can get a performant flip chip strategy measured long enough before Run3's deadline, spec-compliant drive might be possible, though.
```
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---
## message-1513204904230129704
**2026-06-07T15:36:03.156+00:00 โ RebelMike (@rebelmike)**
- Message ID: `1513204904230129704`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513204904230129704
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
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**Content**
```text
I've done a fair amount with VGA and DVI/HDMI, but haven't touched DP, so not sure what's required for the encoder.
I guess I remain sceptical about getting anything like that speed, but then I haven't actually got my hands on any gf180 chips yet. On sky130 though the output drivers in the default padframe TT uses are really weak - you struggle to get a clean signal above 33MHz.
```
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---
## message-1513205563830440047
**2026-06-07T15:38:40.417+00:00 โ namibj**
- Message ID: `1513205563830440047`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513205563830440047
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
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**Content**
```text
If I get far enough to where the serializer takes some shape on track for getting finished by the deadline, you are free to make the digital feed for the serializer, it's gonna have a couple bits (10~20) of VCO load trim to select a choosen number of PMOS fingers to connect the VDD side of the pull-up-resistors to VDD, some way of setting straight alternating bit pattern to output clock signal instead of data, and probably some way of turning off the output of the divided clock onto the GPIO.
Otherwise, it'd be free to select itself a mode where it takes in 16 bits of GPIO parallel if feasible as DDR even, and feed them to the serializer core instead of feeding the PRBS-31 to it.
```
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---
## message-1513205873420402799
**2026-06-07T15:39:54.229+00:00 โ namibj**
- Message ID: `1513205873420402799`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513205873420402799
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
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**Content**
```text
There's approximately half a normal tt tile space for all the digital stuff.
```
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---
## message-1513206426015633558
**2026-06-07T15:42:05.978+00:00 โ namibj**
- Message ID: `1513206426015633558`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513206426015633558
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
I do feel like I'l get to draw the amplifier (as needed for fan out in general) at least today, tho.
```
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---
## message-1513208529131929750
**2026-06-07T15:50:27.4+00:00 โ namibj**
- Message ID: `1513208529131929750`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513208529131929750
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- https://discord.com/channels/1361349522684510449/1408135265427394661/1513204904230129704
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```text
If I've made enough progress in 7 days, I'd welcome you to make a digital SCL section for feeding the analog core with either PRBS-31 or notably a 16-wide input that might as well be DDR w.r.t. the exported GPIO clock.
```
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---
## message-1513208844044472351
**2026-06-07T15:51:42.481+00:00 โ namibj**
- Message ID: `1513208844044472351`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513208844044472351
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**Content**
```text
Would allow testing of DP transmission with an external encoder and external PLL.
```
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---
## message-1513218610275815484
**2026-06-07T16:30:30.932+00:00 โ RebelMike (@rebelmike)**
- Message ID: `1513218610275815484`
- Author ID: `691780627338625077`
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- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513218610275815484
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
Generating PRBS31 looks straightforward - are you targetting TT gf0p3 for this?
```
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---
## message-1513233015201861802
**2026-06-07T17:27:45.334+00:00 โ namibj**
- Message ID: `1513233015201861802`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513233015201861802
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
yes
```
Other message metadata
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---
## message-1513233629726249102
**2026-06-07T17:30:11.848+00:00 โ namibj**
- Message ID: `1513233629726249102`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513233629726249102
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1513218610275815484
Reference data
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```text
This is more about that I won't have time to do a digital section that can re-use the 16 normal user inputs for data feed, so to get that, I'd be calling upon help/offering collaboration on that aspect after getting the base core part into a state where it is clearly realistic to get to actually have a functioning data serializer component.
```
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---
## message-1513235954322636991
**2026-06-07T17:39:26.075+00:00 โ RebelMike (@rebelmike)**
- Message ID: `1513235954322636991`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513235954322636991
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
````text
Yes, understood - and I'm much more familiar with the digital tooling than the analog side of things. This should implement ```
module prbs31 (
input wire clk,
input wire rst_n,
input wire en,
output reg [30:0] q
);
always @(posedge clk or negedge rst_n) begin
if (~rst_n) q <= '1;
else if (en) begin
q[0] <= q[30] ^ q[27];
q[30:1] <= q[29:0];
end
end
endmodule
```
is that roughly what you're after?
````
**Attachments**
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---
## message-1513236128239456406
**2026-06-07T17:40:07.54+00:00 โ RebelMike (@rebelmike)**
- Message ID: `1513236128239456406`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `ThreadCreated`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513236128239456406
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
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**Content**
```text
Started a thread.
```
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---
## message-1513391093230604348
**2026-06-08T03:55:54.073+00:00 โ namibj**
- Message ID: `1513391093230604348`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513391093230604348
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1510078451703480472
Reference data
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```text
unfortunately that tool so far seems rather reluctant in giving me blocks that are closer to custom drawn than those fully-automatic fire-and-forget "with dnwell + with guard ring + with substrate tap + oh-yeah-source-and-drain-have-to-come-out-the-same-side" ๐
Seems a little problematic so far due to having to keep an eye on electromigration limits due to transistors driven into very fast not efficient regimes.
```
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---
## message-1513391431060947054
**2026-06-08T03:57:14.618+00:00 โ namibj**
- Message ID: `1513391431060947054`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513391431060947054
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
I'll sleep over it to make the judgement call of whether to continue going with this for now or whether to go for other basic-multifinger-structure-drawing code.
```
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---
## message-1513398039488761866
**2026-06-08T04:23:30.19+00:00 โ namibj**
- Message ID: `1513398039488761866`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513398039488761866
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
ok I gotta confirm with proper PEX but if the model already includes the parasitic capacitance of the finger contacts that's not really avoidable anyways, then that 25GBASE-KR TX seems actually not that infeasible without having to do inductors even, though those would help a lot in power efficiency.
```
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---
## message-1513400215703523409
**2026-06-08T04:32:09.04+00:00 โ namibj**
- Message ID: `1513400215703523409`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1513400215703523409
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
2 nH on 10x10 um with access to m2/m3/m4.
Particular gain needed at about 13~15 GHz.
```
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---
## message-1514544476788621403
**2026-06-11T08:19:02.142+00:00 โ Thomas Pluck 2.1 (@tpluck_)**
- Message ID: `1514544476788621403`
- Author ID: `1331673337616793672`
- Nickname: Thomas Pluck 2.1
- User name: tpluck_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1514544476788621403
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
FYI, 6 Danube River characterisation chips have arrived at UC Irvine to be probed.
Would be good to know what other test-structures people would like to prioritise/characterise and just how much free-space we'll have on run two try out for the community.
```
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---
## message-1514732227244851390
**2026-06-11T20:45:05.339+00:00 โ namibj**
- Message ID: `1514732227244851390`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1514732227244851390
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1514544476788621403
Reference data
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**Content**
```text
native NMOS both oxides in a way that somehow allows for extracting local mismatch models, with channel dimensions down to litho minimums, not just electrically suggested ">=1.8um, or it'll _leak too much when off_" restrictions that are currently enforced by the SPICE model deck in the openPDK.
Perhaps some way of stress-testing SiN passivation crack propagation susceptibility when insisting on keeping the guard ring metal passivated, such that ACF-style (and/or similar) cheap flip chip packaging will be easy to select as a padframe "option" with hopefully just minor yield impact if one decides to just go for CoB wire bonding instead? Could be nice to combine with some M5-and-up-only (except perhaps a bit of vias down to redistribution/cross-connecting traces below) flip chip bond pad pitch/"resolution" stress testing structure that'll shoot allow us to trial on actual dies how the pad-connected-well-enough/not-shorting-nets yield relates to pad density.
If the DRC checks won't aggressively stop us, someone might be up to draw up a couple thyristors and/or triacs. Triggered crowbars are quite helpful for being able to clamp excess (e.g ESD) voltage without being beholden to the inherent limitations of single-junction plain pn diodes, such as not having to rely on the presence of a low-impedance VDD to sink current into, but instead being able to "just" turn on a strong bipolar "open-collector"-like output "driver" that can even clamp to below VDD if one e.g. uses thin oxide inputs for low voltage signaling standards that operate with peaks substantially below system VDD. Imagine using a series inductor to tame the ESD pulse enough to not current crowd (excess `dI/dt` causing localized overheating) the thyristor/bipolar clamp but otherwise using the inductor to fairly effectively match the input gate capacitance of the transistor to the output/port nominal impedance. As opposed to massive passive diodes to rails together with dumb lossy ohmic series resistors.
Also: https://ieeexplore.ieee.org/document/7937877 (JFET in what looks like a very plain 250nm CMOS process) / https://www.semanticscholar.org/paper/A-JFET-CMOS-Technology-for-Low-Noise-Sensor-Takao-Asaoka/7aac24f59d2ac537ed6eed35a17e6ac8b60f1a5b (JFET in what sounds possibly less-plain CMOS and from the few numbers I could read due to language barrier, sounding like 700 nm CMOS) / some attempts at CCD structures, those all sound nice to trial at least a little bit when we're already working an area that's not "production suitable chips" and is expected to be fed to a probing station.
From my rough understanding, it should probably be possible to trick the litho steps (normal used for fabricating some of the accessible mosfets) to form "functional" CCD structures.
Not like, _good,_ but c.f. _Reticon SAD-1024_ like CCD structures don't need to worry about photoelectric optimization beyond "better put it in an opaque package".
```
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---
## message-1515621648479551648
**2026-06-14T07:39:19.886+00:00 โ Vipul (@vipul.sh)**
- Message ID: `1515621648479551648`
- Author ID: `1214459146217201704`
- Nickname: Vipul
- User name: vipul.sh
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1515621648479551648
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
For layout,drc, lvs for analog with gf180, what is the recommended flow, Klayout or magic?
```
Other message metadata
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---
## message-1515650076645523457
**2026-06-14T09:32:17.689+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1515650076645523457`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1515650076645523457
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
The wafer.space precheck uses Klayout DRC. However, if you pass magic DRC, it is very likely that you will also pass KLayout DRC.
As for the layout, it depends on your preference. I think most designs currently being made are using magic. The KLayout PCells for gf180mcu use GDSFactory and are a bit spotty. Regarding LVS, you can either use magic+netgen or LVS with Klayout, which has recently been improved.
```
**Reactions**
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---
## message-1515713521885647091
**2026-06-14T13:44:24.213+00:00 โ tnt (@246tnt)**
- Message ID: `1515713521885647091`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1515713521885647091
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
So a bit of a question of interpretation for the PDK : Is `Vn.2b` meant to apply to vias attached to different metal zones ?
```
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---
## message-1515713556157300746
**2026-06-14T13:44:32.384+00:00 โ tnt (@246tnt)**
- Message ID: `1515713556157300746`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1515713556157300746
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06_media/2026-06-14_528x382_scrot-0EC13.png
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---
## message-1515713738412523582
**2026-06-14T13:45:15.837+00:00 โ tnt (@246tnt)**
- Message ID: `1515713738412523582`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1515713738412523582
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
i.e. should it apply to the above ( from a MOM cap )
```
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---
## message-1515714002309611640
**2026-06-14T13:46:18.755+00:00 โ tnt (@246tnt)**
- Message ID: `1515714002309611640`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1515714002309611640
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
The diagram in the PDK shows them on the same metal but other than that, is not explicit in any way.
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06_media/2026-06-14_185x206_scrot-A5C98.png
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---
## message-1515714188683640852
**2026-06-14T13:47:03.19+00:00 โ tnt (@246tnt)**
- Message ID: `1515714188683640852`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1515714188683640852
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
The current KLayout deck reports an error. But the current magic techfile generated those vias. I'm not even sure if it would be possible to get magic to realize there is an array there ...
```
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---
## message-1515750593379958839
**2026-06-14T16:11:42.746+00:00 โ bailey (@bailey8889)**
- Message ID: `1515750593379958839`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `ThreadCreated`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1515750593379958839
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
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```text
Started a thread.
```
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---
## message-1516079486813339770
**2026-06-15T13:58:37.051+00:00 โ namibj**
- Message ID: `1516079486813339770`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1516079486813339770
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Content**
```text
I have this basic (well, technically, the PMOS are arranged differently for speed reasons) "ring oscillator" cell; there's 2 of these cells back-to-back acting as a direct quadrature phase clock source, albeit with naturally limited slew rate.
Is there any reason not to make it as big as necessary to directly tap all the clock feeds off of it, especially if I want to use the quadrature clock feeds in similar source-coupled "differential nmos pairs" logic?
Vs. a more "proper" clock tree, at least if this is contained to a single serdes channel worth of area?
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-06/2026-06_media/1000047004-9D409.png
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---
## message-1516863290884751362
**2026-06-17T17:53:10.504+00:00 โ Thomas Pluck 2.1 (@tpluck_)**
- Message ID: `1516863290884751362`
- Author ID: `1331673337616793672`
- Nickname: Thomas Pluck 2.1
- User name: tpluck_
- Type: `Reply`
- Edited: 2026-06-17T17:53:41.626+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1516863290884751362
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1515650076645523457
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```text
We (me @ GDSFactory) actually recently updated these to be XOR clean replicas of the Magic ones - so it should ideally be *stable-r* but naturally, buyer beware.
```
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---
## message-1520008973795983512
**2026-06-26T10:12:59.754+00:00 โ dmv (@.dmv)**
- Message ID: `1520008973795983512`
- Author ID: `356185479911047169`
- Nickname: dmv
- User name: .dmv
- Type: `ThreadCreated`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1520008973795983512
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-06/2026-06.json
**Reply/reference**
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Started a thread.
```
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---
## message-1521885730278867087
**2026-07-01T14:30:33.368+00:00 โ namibj**
- Message ID: `1521885730278867087`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521885730278867087
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1009193568256135208/1510576446165356553/1521839041597800558
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```
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---
## message-1521893037528055829
**2026-07-01T14:59:35.552+00:00 โ namibj**
- Message ID: `1521893037528055829`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521893037528055829
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1521885730278867087
Reference data
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**Content**
```text
@BreakingTaps perhaps you'd come up with info on the matter of photovoltaic mode operation of cells; particularly on the subject of whether multiple photodiodes in photovoltaic mode can be series connected to produce sufficient voltage for CMOS logic; I'd have ideas based on native nmos that wouldn't require more than the 500~700mV to operate but they're all unfortunately large structures due to the unavailability of any pmos devices with threshold voltages "reasonably below" diode forward voltage.
I'd guess there are some available (on gf180mcuD) tactics for bootstrapping a charge pump voltage booster from a singular solar cell?
Maybe substrate-tied dnwell with an lvpwell-to-dnwell photodiode (producing positive voltage relative to substrate) acting in series with a separate (d)nwell-to-psub diode (producing negative voltage relative to substrate) could work.
The negative bias could allow biasing pmos devices to act as resistors for native-nmos devices doing the actual logic, which would massively shrink the area requirements for the logic and probably also comfortably stabilize operating reliability against process variations in native nmos threshold voltage.
No good idea yet about back channel though; forward channel is obvious through just sufficiently deep amplitude modulation of the light, some probably-MIM storage caps for logic voltage supply, and some dynamic logic kind of data demodulator.
Or if there's two beams available obviously just either differential signaling with some kind of clock recovery or a synchronous clock-and-data interface.
My goal is btw. to get a PUF-like structure that can be read out at the die sorter without needing to touch the bond/probe pads during this, to later post-packaging read the same PUF-like from digital logic, being able to match against the database the die sorter created, getting to look up what coordinates on which wafer that die came from. Or realistically just what reticle on which wafer (it's far cheaper to just encode the intra-reticle location with a few bits of mask ROM structure).
I'm aiming towards enabling full traceability that way; if one wants easier IDs one can just put efuse PROM onto the die and burn these coordinates and other tracing information during the first post-packaging e-test of the die, just as part of the test pattern interaction; might require some scripting there but shouldn't be too involved for a vaguely flexible tester platform.
```
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---
## message-1521894788868210770
**2026-07-01T15:06:33.104+00:00 โ namibj**
- Message ID: `1521894788868210770`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521894788868210770
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
Oh, NFC-style with on-die inductor comes to the mind as well, just now!
```
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---
## message-1521894822271647836
**2026-07-01T15:06:41.068+00:00 โ namibj**
- Message ID: `1521894822271647836`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521894822271647836
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1521894788868210770
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```text
@Tim 'mithro' Ansell
```
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---
## message-1521907493809164439
**2026-07-01T15:57:02.198+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1521907493809164439`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521907493809164439
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1521893037528055829
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```text
hmm, I do recall reading a paper some years ago about an image sensor that was self-powered. I forget the scheme exactly but it basically toggled between energy harvesting and image capture. so in principle it's probably doable. will see if I can find the paper...
```
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---
## message-1521944517752655882
**2026-07-01T18:24:09.394+00:00 โ namibj**
- Message ID: `1521944517752655882`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521944517752655882
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1521907493809164439
Reference data
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```text
Hmmm; the NFC idea that came right after I sent that wall-of-text (it's technically the immediately following message in this channel) does feel somewhat more applicable right now at least; if using top metal for the resonant inductor of it and de-tuning by switching a cap into/out of the tank or even just modulating the load it puts onto the tank via some kind of like shunt/series combo LDO regulator, or literally shorting out the tank (with sufficiently limited duty cycle ofc.):
some way probably has enough intensity in the back channel to make it not require high specs from the reader.
After all, for reasons of getting by with a compact coil and not having the global PDN ring enclosing the "regular user area" of the die wreck the Q of the resonant tank, I'd expect this to effectively-need a near-field H-field antenna. probably set up to sweep the frequency band of interest until it hits evidence of exciting the receiver's resonance (process variations cause some shift in resonant frequency), perhaps in a shape of a narrow gap between two coils thick enough for the die to slide into and deep enough to reach in just past the pad&PDN ring, or even just a more-pointy-tip "loop antenna"/H-field-oscilloscope-probe roughly visually aligned to and pointed close to but not touching the die by where that die has it's NFC-antenna.
Light clearly has the benefit of less risk of accidentally scratching the die and not worrying about EMC compliant operation of the reader, but I'd assume a back channel to be FAR more difficult to pull off than just using simple well-trodden NFC tech.
[||If I knew of a low-cost source for single-emitter variants of the triple-emitter https://ams-osram.com/products/lasers/ir-lasers-vcsel/osram-bidos-e1005-l-plpvyl1-940a-e , I'd be far more hopeful in possibly making optically powered bootstrapping (coupled through a simple multimode fiber) a silicon-proven thing on not-my-dime (well, as far as the tapeout masks for the process of silicon-proving the bootstrap mechanic goes)....
...as that should be readily usable for bootstrapping any design variants of the switched-capacitor based MVDC-tamer plans (which I have _not_ given up on bringing towards a hands-on PoC demonstrator). Like, charging the local LV supply capacitors through optically provided power while the higher-voltage supply is not yet connected, as they later harvest from the resonant EM fields once in operation, and it's not necessarily easy to inject such "RF" power and not even necessarily feasible to bootstrap off of that due to the harvesting architecture that's preferred for steady-state possibly requiring synchronous rectification or switching of the power transistor.
E.g. one could have a rectification diode from the harvesting node into the local storage capacitor, a capacitor from that node to the high-voltage drain node of the power switch, and a low-loss clamp shunt transistor that can ground the harvest node to the power transistor's source which also acts as the local ground.
...errr, the last bit of thinking I allotted to the matter this week just revealed that if the power switch has automatic reverse diode behavior for the drain node, it would probably be safe to use this particular harvesting architecture as the voltage amplitude during bootstrap procedure is limited by the drain to-source capacitance (including the harvesting capacitor's contribution) and the bootstrap current amplitude, while the power drain-source leakage even if little prevents the drain voltage from building up much beyond the previously given implied peak-peak voltage amplitude, as long as it exceeds bleed-to-environment enough, and reverse voltage is clamped by the drain-source diode of the power switch....
||]
```
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---
## message-1521953520352231425
**2026-07-01T18:59:55.781+00:00 โ RRichmondR (@rrichmondr)**
- Message ID: `1521953520352231425`
- Author ID: `692781607102185522`
- Nickname: RRichmondR
- User name: rrichmondr
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521953520352231425
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
Hi everyone, is ti possible to change the IO configuration on the chip ? for example the full tie list 56 (bidir: 40, in: 14, analog: 2), could we add more analogs ? and still get the chip on board packagin ?
```
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---
## message-1521954907907817482
**2026-07-01T19:05:26.6+00:00 โ Andrew Wingate (@anfroholic)**
- Message ID: `1521954907907817482`
- Author ID: `756011607603019777`
- Nickname: Andrew Wingate
- User name: anfroholic
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521954907907817482
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
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Yes @RRichmondR you are able to change any of the io pads to whatever you wish. With the cob the ground nets will be shorted and the power traces (currently) have decoupling caps.
```
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---
## message-1521957940041617502
**2026-07-01T19:17:29.517+00:00 โ RRichmondR (@rrichmondr)**
- Message ID: `1521957940041617502`
- Author ID: `692781607102185522`
- Nickname: RRichmondR
- User name: rrichmondr
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521957940041617502
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
and is there any information regarding the max io speed on the digital ones ? i couldn't find anything
```
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---
## message-1521968788877213846
**2026-07-01T20:00:36.081+00:00 โ RebelMike (@rebelmike)**
- Message ID: `1521968788877213846`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521968788877213846
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
Sample size of 1, but on the Tiny Tapeout board I could clock the factory test design at up to 188MHz and it would work correctly. On the output side I don't have a good enough scope but the drivers are pretty strong - they still seemed pretty good at 100MHz
```
**Reactions**
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---
## message-1521971337126744065
**2026-07-01T20:10:43.631+00:00 โ tnt (@246tnt)**
- Message ID: `1521971337126744065`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1521971337126744065
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
They're actually a bit too strong ... so if you wiring isn't up to par you get quite a bit of ringing due to the fast edge, so much I actually got some double clocks on spi lines in some conditions.
```
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---
## message-1522398205340553226
**2026-07-03T00:26:56.944+00:00 โ namibj**
- Message ID: `1522398205340553226`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1522398205340553226
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/analog/2026-07/2026-07.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1521968788877213846
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what happened if you went a little beyond that speed? Minor amount of swalloed clocks? Minor excess count? Sudden breakage? No faster quality clock source on hand to try to feed in and see if it can go faster?
```
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---
## message-1522506709422047394
**2026-07-03T07:38:06.333+00:00 โ RebelMike (@rebelmike)**
- Message ID: `1522506709422047394`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1522506709422047394
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
Seems like sudden breakage, when Iโve run this test before on sky chips itโs normally shown one missing count, then two before breaking down. But here it suddenly starts missing lots of clocks. Unfortunately two variables have changed at once though because TT has moved to a new demo board with mezzanine connectors so I canโt test in my old setup, and the demo board has a possibly non-ideal debounce circuit for the manual clock button hanging off the clock line.
Update though, I tried a higher drive strength from the RP2350 thatโs generating the clock and got up to 220MHz ok (again sudden breakage at 224MHz)
```
**Reactions**
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## message-1523708254683795496
**2026-07-06T15:12:37.047+00:00 โ tnt (@246tnt)**
- Message ID: `1523708254683795496`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `ThreadCreated`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1523708254683795496
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Started a thread.
```
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---
## message-1524427820720328754
**2026-07-08T14:51:54.959+00:00 โ Olle (@osvel)**
- Message ID: `1524427820720328754`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Edited: 2026-07-08T15:00:15.805+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1524427820720328754
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
What's your preferred workflow for analog / mixed circuits? I'm currently trying out xschem + ngspice, but have a hard time to load the gf180mcuC pdk lib properly.
```
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---
## message-1524535424821891246
**2026-07-08T21:59:29.776+00:00 โ bailey (@bailey8889)**
- Message ID: `1524535424821891246`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1524535424821891246
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
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@Leo Moser (mole99) is wafer.space using gf180mcuC as opposed to gf180mcuD?
```
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---
## message-1524536182028107947
**2026-07-08T22:02:30.308+00:00 โ Olle (@osvel)**
- Message ID: `1524536182028107947`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1524536182028107947
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**Content**
```text
Sorry, typo by me! ๐
```
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---
## message-1524540578702954597
**2026-07-08T22:19:58.557+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1524540578702954597`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1524540578702954597
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Nope, gf180mcuD :)
```
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---
## message-1525887844772483132
**2026-07-12T15:33:31.819+00:00 โ namibj**
- Message ID: `1525887844772483132`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1525887844772483132
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**Content**
```text
Ok let's dig into the https://www.tinytapeout.com/news/mini-mosbius/ design files and find out if it can be almost-copy-pasted to gf18mcuD with just a bit of scaling to fit the AFAIK substantially less compact standard cell logic that I'm assuming to make up a large part of the configuration bitstream handling.
```
**Embeds**
- Resolved media URL: https://www.tinytapeout.com/news/mini-mosbius/
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07_media/thumbnail-959F9.jpg
Embeds data
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---
## message-1525971997501423796
**2026-07-12T21:07:55.393+00:00 โ RRichmondR (@rrichmondr)**
- Message ID: `1525971997501423796`
- Author ID: `692781607102185522`
- Nickname: RRichmondR
- User name: rrichmondr
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1525971997501423796
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
i have generated the padframe for our mix signal design.
my undesrtanding is that ill place on that gds our analog cells and then upload that gds to the platform am i right or am i missing something ?
```
Other message metadata
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---
## message-1526011624589365479
**2026-07-12T23:45:23.227+00:00 โ namibj**
- Message ID: `1526011624589365479`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526011624589365479
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1525971997501423796
Reference data
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**Content**
```text
Pretty much?
That's one way at least.
```
**Reactions**
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---
## message-1526011784945991801
**2026-07-12T23:46:01.459+00:00 โ namibj**
- Message ID: `1526011784945991801`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526011784945991801
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
There is a point where you need to connect your digital and your analog though.
```
Other message metadata
```json
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---
## message-1526277182643634186
**2026-07-13T17:20:37.201+00:00 โ RRichmondR (@rrichmondr)**
- Message ID: `1526277182643634186`
- Author ID: `692781607102185522`
- Nickname: RRichmondR
- User name: rrichmondr
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526277182643634186
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
the connection would i have to do it mannually right ? (i ran the drc on klayout and got errors on the IOs of the padframe not the design itself)
one friend is thinking about putting the analog cells as macros and let openroad do the routing
```
Other message metadata
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---
## message-1526311482843861153
**2026-07-13T19:36:55.006+00:00 โ namibj**
- Message ID: `1526311482843861153`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526311482843861153
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1526277182643634186
Reference data
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**Content**
```text
You can pre-route any critical analog connections in the flow with openroad picking up the reminder; @Tholin 's submissions AFAIK rely on the auto-route approach; not sure to what extent they've pre-routed any of the nets though.
```
Other message metadata
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---
## message-1526311953163882646
**2026-07-13T19:38:47.139+00:00 โ Tholin (@tholin)**
- Message ID: `1526311953163882646`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526311953163882646
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
I didnโt know you could do this
```
Other message metadata
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---
## message-1526312389191139359
**2026-07-13T19:40:31.096+00:00 โ namibj**
- Message ID: `1526312389191139359`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526312389191139359
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1526311953163882646
Reference data
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**Content**
```text
It's like a power wire just less griddy
```
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---
## message-1526350366084698204
**2026-07-13T22:11:25.493+00:00 โ Olle (@osvel)**
- Message ID: `1526350366084698204`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Edited: 2026-07-13T22:13:04.17+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526350366084698204
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
https://gf180mcu-pdk.readthedocs.io/en/latest/analog/model_parameters/LV/LV_9.html
Is this not part of the public release or is it just undocumented?
```
Other message metadata
```json
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---
## message-1526353847247704084
**2026-07-13T22:25:15.467+00:00 โ Olle (@osvel)**
- Message ID: `1526353847247704084`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526353847247704084
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
And one other question... People doing analog designs, are you using deep N-wells / guard rings? Are they really important? ๐
I saw there was a klayout plugin for sg13g2 (https://github.com/mwolodzk/klayout-sg13g2-tap-guard-ring-plugin) for making these automatically around a selection (for instance when using matched pairs). Thought myself about copying this but using the rules from gf180_fd_pr
```
**Embeds**
- Resolved media URL: https://github.com/mwolodzk/klayout-sg13g2-tap-guard-ring-plugin
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Embeds data
```json
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"color": "#1E2327",
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---
## message-1526359496803221706
**2026-07-13T22:47:42.426+00:00 โ namibj**
- Message ID: `1526359496803221706`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526359496803221706
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1526350366084698204
Reference data
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**Content**
```text
Latter.
```
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---
## message-1526360384020414576
**2026-07-13T22:51:13.955+00:00 โ namibj**
- Message ID: `1526360384020414576`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526360384020414576
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1526353847247704084
Reference data
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**Content**
```text
If you don't know better, go for them; our PEX flow(s) AFAIK still completely lack support for modeling substrate currents, so we can't "just" "simulate and see" if it behaves without the dnwell.
```
Other message metadata
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---
## message-1526458115833200671
**2026-07-14T05:19:35.035+00:00 โ Olle (@osvel)**
- Message ID: `1526458115833200671`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526458115833200671
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1526360384020414576
Reference data
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**Content**
```text
Good tip, thanks! ๐ I guess I will use them then. :^)
```
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---
## message-1526545581001150567
**2026-07-14T11:07:08.356+00:00 โ Olle (@osvel)**
- Message ID: `1526545581001150567`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Edited: 2026-07-14T11:09:34.672+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526545581001150567
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
Oh wait, are all 3.3v PCells totally broken? I have tried both in magic and klayout, both seem to produce illegal nfets (w = 0.36u l = 0.28u, nf=1), mostly regarding grid alignment. For example, the gate metal seems to be misaligned in klayout, but too small in magic.
```
Other message metadata
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---
## message-1526545838430486639
**2026-07-14T11:08:09.732+00:00 โ Olle (@osvel)**
- Message ID: `1526545838430486639`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526545838430486639
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
Is no-one doing analog stuff using the builtin FETs from gf180_fd_pr?
```
Other message metadata
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---
## message-1526548572877619321
**2026-07-14T11:19:01.675+00:00 โ tnt (@246tnt)**
- Message ID: `1526548572877619321`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526548572877619321
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
The metal in magic is too small area that's expected. That's because it's where you should be connecting your stuff to ... so area will get bigger when you actually wire it to something.
```
**Reactions**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07_media/1f44d-27259.svg
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"nickname": "Olle"
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```
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---
## message-1526548805934256189
**2026-07-14T11:19:57.24+00:00 โ Olle (@osvel)**
- Message ID: `1526548805934256189`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526548805934256189
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
ok so its maybe just klayout then that is broken. It doesn't seem to properly align to the grid, which is a problem :^) Will try out magic for a while
```
Other message metadata
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---
## message-1526549286873989150
**2026-07-14T11:21:51.905+00:00 โ Olle (@osvel)**
- Message ID: `1526549286873989150`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526549286873989150
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
I must say the grid/pixel based system feels nicer than the object based one in klayout
```
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---
## message-1526550680066719835
**2026-07-14T11:27:24.068+00:00 โ tnt (@246tnt)**
- Message ID: `1526550680066719835`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526550680066719835
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
Yeah, personally I prefer magic for layout too. Other prefer KLayout, there is definitely some amount of subjective preference in there, you can make successfull layout in both and there will be things that work well and things that are a bit stickier with both.
```
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---
## message-1526555503788953750
**2026-07-14T11:46:34.133+00:00 โ Olle (@osvel)**
- Message ID: `1526555503788953750`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526555503788953750
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
hm.. `Metal1 spacing < 0.23um (M1.2a)`
This is before drawing anything.
```
**Attachments**
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07_media/image-2D1D6.png
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---
## message-1526555944719224912
**2026-07-14T11:48:19.259+00:00 โ Olle (@osvel)**
- Message ID: `1526555944719224912`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526555944719224912
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
Sorry, I'm a bit of a noob :^) I guess I can go into it and quickly fix it up?
```
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---
## message-1526926130484088892
**2026-07-15T12:19:18.423+00:00 โ Matt Venn (@mattvenn)**
- Message ID: `1526926130484088892`
- Author ID: `492702620759228416`
- Nickname: Matt Venn
- User name: mattvenn
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526926130484088892
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
It's because it wants metal on top, without metal over the via you get this DRC
```
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---
## message-1526943948495392860
**2026-07-15T13:30:06.568+00:00 โ were491 (@were491.)**
- Message ID: `1526943948495392860`
- Author ID: `325334453213986816`
- Nickname: were491
- User name: were491.
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526943948495392860
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1526545581001150567
Reference data
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**Content**
```text
o yea this wasn't an issue with dbu=0.005u so theoretically you can just design with that and then flatten everything before changing dbu back to 0.001u and then it won't be misaligned
```
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---
## message-1526967638331494440
**2026-07-15T15:04:14.665+00:00 โ namibj**
- Message ID: `1526967638331494440`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526967638331494440
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1526943948495392860
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**Content**
```text
Yeah I do question the sense of a dbu smaller than a mandatory minimum quantization/snapping grid.
```
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---
## message-1526968280676569179
**2026-07-15T15:06:47.812+00:00 โ were491 (@were491.)**
- Message ID: `1526968280676569179`
- Author ID: `325334453213986816`
- Nickname: were491
- User name: were491.
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526968280676569179
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
gf180 pdk said to use 0.005 dbu but waferspace wants 0.001 for some reason
```
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---
## message-1526969323787386931
**2026-07-15T15:10:56.509+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1526969323787386931`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526969323787386931
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
The dbu for gf180mcu is 0.001, the manufacturing grid is 0.005.
```
Other message metadata
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---
## message-1526969639534592010
**2026-07-15T15:12:11.789+00:00 โ Olle (@osvel)**
- Message ID: `1526969639534592010`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526969639534592010
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1526943948495392860
Reference data
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**Content**
```text
Good tip, will keep in mind! I decided to abandon klayout (for better or for worse) and just later import my design to do their DRC.
```
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---
## message-1526970400825933927
**2026-07-15T15:15:13.295+00:00 โ Olle (@osvel)**
- Message ID: `1526970400825933927`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526970400825933927
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
I figured out the issue in magic also. Seems like picking a too small L causes this. Should probably report it but its a design constraint so don't really know how the pcell generator should work tbh
```
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---
## message-1526971358133751918
**2026-07-15T15:19:01.535+00:00 โ namibj**
- Message ID: `1526971358133751918`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526971358133751918
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1526969323787386931
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**Content**
```text
Yeah; can you justify that choice beyond "it was picked many years ago and _nice round number_ and changing now would break too much"?
```
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---
## message-1526972599068791014
**2026-07-15T15:23:57.397+00:00 โ tnt (@246tnt)**
- Message ID: `1526972599068791014`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526972599068791014
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
The latter is quite a big concern ๐
For instance, I know in TT because we copy the stream directly when including macro to make sure we don't alter them, they need to all have the same unit or they end up at different scales ...
```
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---
## message-1526993873463939226
**2026-07-15T16:48:29.608+00:00 โ namibj**
- Message ID: `1526993873463939226`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1526993873463939226
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1526972599068791014
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Tbf, scaling all coordinates by an exact integer factor while verifying no quantization errors happen is pretty tame risk-wise; but yeah.
I'm mostly just confused as to who thought this current state would have any decency in UX, vs. the dbu enforcing the manufacturing grid to make it literally impossible to trip the OFFGRID DRC (at least on PDKs that don't have layer-dependent manufacturing grids; I think sky130 might have a coarser grid for m3/m4/m5 than for li/poly/comp).
```
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---
## message-1527060987365036172
**2026-07-15T21:15:10.809+00:00 โ were491 (@were491.)**
- Message ID: `1527060987365036172`
- Author ID: `325334453213986816`
- Nickname: were491
- User name: were491.
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1527060987365036172
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**Content**
```text
i feel like the issue is forgetting to scale at some place lol
```
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---
## message-1527061187022295080
**2026-07-15T21:15:58.411+00:00 โ were491 (@were491.)**
- Message ID: `1527061187022295080`
- Author ID: `325334453213986816`
- Nickname: were491
- User name: were491.
- Type: `Default`
- Edited: 2026-07-15T21:16:18.692+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1527061187022295080
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
also, usually you should set a grid size in klayout anyways right? in this case it's just a pcell bug that could be fixed
```
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---
## message-1527061281260175421
**2026-07-15T21:16:20.879+00:00 โ were491 (@were491.)**
- Message ID: `1527061281260175421`
- Author ID: `325334453213986816`
- Nickname: were491
- User name: were491.
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1527061281260175421
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**Content**
```text
~~maybe i'm larping too hard though~~
```
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---
## message-1527097324440911932
**2026-07-15T23:39:34.243+00:00 โ namibj**
- Message ID: `1527097324440911932`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1527097324440911932
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1527061187022295080
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If only that was something hard-enforced, and not a mouse cursor tool courtesy...
```
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---
## message-1527414643801198682
**2026-07-16T20:40:29.074+00:00 โ Olle (@osvel)**
- Message ID: `1527414643801198682`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1527414643801198682
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1527061187022295080
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**Content**
```text
I am sure the PDK has more of these issues. A random idea would be to add regression tests to the pcell library (afaik klayout pcells are written in python) and ensure that the vertices all land on grid
```
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---
## message-1527414770427367568
**2026-07-16T20:40:59.264+00:00 โ Olle (@osvel)**
- Message ID: `1527414770427367568`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1527414770427367568
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**Content**
```text
Could even fuzz the parameters to find edge cases
```
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## message-1527415038158049630
**2026-07-16T20:42:03.096+00:00 โ Olle (@osvel)**
- Message ID: `1527415038158049630`
- Author ID: `290925586266980352`
- Nickname: Olle
- User name: osvel
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1527415038158049630
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-07/2026-07.json
**Content**
```text
(maybe just do this with AI and file some reports)
```
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---
## message-1533185310131749044
**2026-08-01T18:51:03.141+00:00 โ Tholin (@tholin)**
- Message ID: `1533185310131749044`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533185310131749044
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**Content**
```text
Need to make a analog comparator for my next analog layout. Canโt I just re-use my normal opamp schematic for this? As far as I understand, the two are very similar.
```
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## message-1533185406366122114
**2026-08-01T18:51:26.085+00:00 โ Tholin (@tholin)**
- Message ID: `1533185406366122114`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533185406366122114
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
Opamp but the output stage is replaced with a schmitt trigger inverter/buffer = comparator
```
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---
## message-1533185412363976774
**2026-08-01T18:51:27.515+00:00 โ Tholin (@tholin)**
- Message ID: `1533185412363976774`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533185412363976774
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**Content**
```text
?
```
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---
## message-1533185516403687465
**2026-08-01T18:51:52.32+00:00 โ Tholin (@tholin)**
- Message ID: `1533185516403687465`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533185516403687465
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**Content**
```text
Well, maybe not a schmitt trigger depending on the application.
```
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## message-1533185713842028707
**2026-08-01T18:52:39.393+00:00 โ Tholin (@tholin)**
- Message ID: `1533185713842028707`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533185713842028707
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**Content**
```text
Wait, is there even a difference between the two?
```
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## message-1533186706977849434
**2026-08-01T18:56:36.175+00:00 โ tnt (@246tnt)**
- Message ID: `1533186706977849434`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533186706977849434
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```text
It's the same basic concepts but you optimize for different things.
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## message-1533186824955101255
**2026-08-01T18:57:04.303+00:00 โ tnt (@246tnt)**
- Message ID: `1533186824955101255`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533186824955101255
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**Content**
```text
What are the requirements for your comparator ?
```
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## message-1533187303097241740
**2026-08-01T18:58:58.301+00:00 โ Tholin (@tholin)**
- Message ID: `1533187303097241740`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533187303097241740
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**Content**
```text
Iโm worried about the output not being something I can safely feed into a standard cell because it might settle on a voltage between high and low.
```
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## message-1533187471288832063
**2026-08-01T18:59:38.401+00:00 โ Tholin (@tholin)**
- Message ID: `1533187471288832063`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533187471288832063
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**Content**
```text
Thatโs my current concern
```
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## message-1533187637232275476
**2026-08-01T19:00:17.965+00:00 โ Tholin (@tholin)**
- Message ID: `1533187637232275476`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533187637232275476
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**Content**
```text
I can optimize it for the input voltage ranges Iโm using later, when I have some more concrete numbers.
```
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## message-1533187815016366153
**2026-08-01T19:01:00.352+00:00 โ Tholin (@tholin)**
- Message ID: `1533187815016366153`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533187815016366153
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**Content**
```text
opamps have analog outputs, so can generate non-logic-level voltages
```
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## message-1533187962534101173
**2026-08-01T19:01:35.523+00:00 โ tnt (@246tnt)**
- Message ID: `1533187962534101173`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533187962534101173
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**Content**
```text
The general idea is you need enough gain so that any voltage difference at the input will result in the output hitting the rails ...
```
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## message-1533188099574857819
**2026-08-01T19:02:08.196+00:00 โ tnt (@246tnt)**
- Message ID: `1533188099574857819`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533188099574857819
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**Content**
```text
and then ideally some hysteresis so that noise doesn't create a mess if you have slow transitions.
```
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## message-1533188240583164056
**2026-08-01T19:02:41.815+00:00 โ tnt (@246tnt)**
- Message ID: `1533188240583164056`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533188240583164056
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**Content**
```text
And as you said above, a schmitt trigger is not a bad way to provide both more gain as a second stage and hysteresis.
```
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## message-1533188297323581641
**2026-08-01T19:02:55.343+00:00 โ tnt (@246tnt)**
- Message ID: `1533188297323581641`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533188297323581641
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**Content**
```text
This is what I did in the comparator for my 555 clone.
```
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## message-1533188731325120522
**2026-08-01T19:04:38.817+00:00 โ tnt (@246tnt)**
- Message ID: `1533188731325120522`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533188731325120522
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**Content**
```text
But that's highly dependent on the application ... the "comparator" I did on sky 130 ( for high speed differential input ) works differently and just uses positive feedback and 3 stages to have enough gain to force input to a rail.
```
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## message-1533188863131127930
**2026-08-01T19:05:10.242+00:00 โ Tholin (@tholin)**
- Message ID: `1533188863131127930`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533188863131127930
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**Content**
```text
Alright
```
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## message-1533188902054002928
**2026-08-01T19:05:19.522+00:00 โ Tholin (@tholin)**
- Message ID: `1533188902054002928`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533188902054002928
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**Content**
```text
I think iโll look into how to build a schmitt trigger for this
```
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## message-1533189058694746294
**2026-08-01T19:05:56.868+00:00 โ tnt (@246tnt)**
- Message ID: `1533189058694746294`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533189058694746294
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**Content**
```text
And then the comparator I'm working on now for clocked sampling works yet another way because if you sample at regular interval you can have sample step and amplify step.
```
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## message-1533189253410980004
**2026-08-01T19:06:43.292+00:00 โ tnt (@246tnt)**
- Message ID: `1533189253410980004`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
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```text
What's the application ?
```
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## message-1533189777493458954
**2026-08-01T19:08:48.243+00:00 โ tnt (@246tnt)**
- Message ID: `1533189777493458954`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533189777493458954
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**Content**
```text
I have a gf180 schmitt inverter there :
https://github.com/smunaut/tt_tnt_gf_555/blob/main/xschem/inv_schmitt.sch
https://github.com/smunaut/tt_tnt_gf_555/blob/main/mag/inv_schmitt.mag
```
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---
## message-1533189808774582363
**2026-08-01T19:08:55.701+00:00 โ Tholin (@tholin)**
- Message ID: `1533189808774582363`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533189808774582363
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
Overvoltage protection
```
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---
## message-1533189866098262258
**2026-08-01T19:09:09.368+00:00 โ Tholin (@tholin)**
- Message ID: `1533189866098262258`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533189866098262258
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
Sortof, but thatโs the basic idea
```
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---
## message-1533518419369136168
**2026-08-02T16:54:42.572+00:00 โ namibj**
- Message ID: `1533518419369136168`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533518419369136168
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1533187303097241740
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```text
AFAIK the solution to that is to have so many inverters in sequence that noise will make it statistically improbable to end up with metastable voltages at the end.
Clocked comparators afaik help a lot for that, btw.
You get a deliberate regenerative gain stage, suitable for feeding to a couple stages of DFFs just like you'd have to do for digital signals that cross clock domains btw.
```
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---
## message-1533521510738690048
**2026-08-02T17:06:59.612+00:00 โ namibj**
- Message ID: `1533521510738690048`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533521510738690048
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1533189058694746294
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```text
Ohhh, tell what for (if you can); I'm looking mildly anxiously forward to having to do similar but probably substantially more complicated due to needing it to run at probably 16x interleaving ๐
```
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---
## message-1533521796509466635
**2026-08-02T17:08:07.745+00:00 โ tnt (@246tnt)**
- Message ID: `1533521796509466635`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533521796509466635
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
I'm slowly working toward my USB 2.0 HS PHY goal ๐
```
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---
## message-1533538638351171686
**2026-08-02T18:15:03.153+00:00 โ djsftree**
- Message ID: `1533538638351171686`
- Author ID: `810650258819252274`
- Nickname: djsftree
- User name: djsftree
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533538638351171686
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
cap_mim_*_m4m5_noshield , just checking wafer space support the mim, HRES poly resistor (one additional mask?) and Vt NMOS from s10 of pdk.
```
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---
## message-1533542028875530271
**2026-08-02T18:28:31.517+00:00 โ tnt (@246tnt)**
- Message ID: `1533542028875530271`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Edited: 2026-08-02T18:28:35.326+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533542028875530271
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
It supports :
* 2 fF/um^2 MiM
* 1k / sq HRES poly
* Native 6.0v nmos
```
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---
## message-1533546472606535770
**2026-08-02T18:46:10.985+00:00 โ namibj**
- Message ID: `1533546472606535770`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533546472606535770
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
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```text
๐
Do share what you get from that.
```
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---
## message-1533547334934331503
**2026-08-02T18:49:36.58+00:00 โ namibj**
- Message ID: `1533547334934331503`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Edited: 2026-08-02T19:32:14.645+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533547334934331503
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
[I'll also ask in the substantially non-overlapping chipalooza matrix, as it's more near-term relevant to there; I'll only expect to have such structure for e-test on Run3, but still..]
Regarding the C_Offset capacitance digital trim banks:
Is that what the sky130 PDK calls "accumulation-mode varactors"?
Do we have an appropriate device on gf180mcuD and/or IHP SG13cmos5L?
[edit:]... we do seem to have an `SVaricap` on IHP SG13cmos5L; not so sure yet about the situation on gf180mcuD. Which isn't helped by my somewhat poor understanding of the supposed behavior of these structures that can't be replicated (properly) by "just" using "normal" PMOS devices in their own dedicated nwell, with their guard ring and that.
```
**Attachments**
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---
## message-1533550982523392042
**2026-08-02T19:04:06.233+00:00 โ Tholin (@tholin)**
- Message ID: `1533550982523392042`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533550982523392042
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
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**Content**
```text
Ah, but I'd need a clock source for DFFs
```
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---
## message-1533557177221124357
**2026-08-02T19:28:43.164+00:00 โ namibj**
- Message ID: `1533557177221124357`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533557177221124357
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
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**Content**
```text
What are you trying to lift the signal into then? Or is the purpose of the S that shall consume the comparator feed secret for the time being?
```
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---
## message-1533571478648393848
**2026-08-02T20:25:32.89+00:00 โ djsftree**
- Message ID: `1533571478648393848`
- Author ID: `810650258819252274`
- Nickname: djsftree
- User name: djsftree
- Type: `Reply`
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```text
thanks!
```
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---
## message-1533573205699199147
**2026-08-02T20:32:24.651+00:00 โ tnt (@246tnt)**
- Message ID: `1533573205699199147`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
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@namibj There are varactor on gf180. All named "moscap".
```
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---
## message-1533573398591045734
**2026-08-02T20:33:10.64+00:00 โ namibj**
- Message ID: `1533573398591045734`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533573398591045734
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```text
oh.
Are they built like the sky130 ones?
```
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---
## message-1533573552479932498
**2026-08-02T20:33:47.33+00:00 โ tnt (@246tnt)**
- Message ID: `1533573552479932498`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533573552479932498
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**Content**
```text
Not sure never looked. magic has a pcell.
```
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---
## message-1533573821343203438
**2026-08-02T20:34:51.432+00:00 โ tnt (@246tnt)**
- Message ID: `1533573821343203438`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533573821343203438
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```text
What I'm designing ATM looks basically similar to that drawing, except the input stage is pmos because common mode is very low, so nmos don't work there.
```
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---
## message-1533574030949351524
**2026-08-02T20:35:41.406+00:00 โ namibj**
- Message ID: `1533574030949351524`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533574030949351524
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1533573821343203438
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```text
yeah that aspect in this one is handled by the CTLE preamp section drawn upper left
```
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---
## message-1533574146825654314
**2026-08-02T20:36:09.033+00:00 โ namibj**
- Message ID: `1533574146825654314`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533574146825654314
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1533573821343203438
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```text
https://people.engr.tamu.edu/spalermo/ecen689/lecture10_ee689_rx_circuits.pdf
```
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---
## message-1533574860637208668
**2026-08-02T20:38:59.219+00:00 โ namibj**
- Message ID: `1533574860637208668`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533574860637208668
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1533573821343203438
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```text
Time-interleaved or not for the USB-HS target?
```
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---
## message-1533575152032551104
**2026-08-02T20:40:08.693+00:00 โ namibj**
- Message ID: `1533575152032551104`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533575152032551104
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**Content**
```text
If you happen to have some reading material you can link on the clock recovery part of the subject matter, please do.
```
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---
## message-1533575396795351222
**2026-08-02T20:41:07.049+00:00 โ tnt (@246tnt)**
- Message ID: `1533575396795351222`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533575396795351222
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
Yes, my VCO is running at 240 MHz with 4 phase 0 90 180 270.
```
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---
## message-1533575465086750721
**2026-08-02T20:41:23.331+00:00 โ tnt (@246tnt)**
- Message ID: `1533575465086750721`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533575465086750721
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**Content**
```text
Ok, gotta go sorry ...
```
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---
## message-1533576154647232582
**2026-08-02T20:44:07.735+00:00 โ namibj**
- Message ID: `1533576154647232582`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1533576154647232582
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
I otherwise feel like I'd put like 4 extra ones next to the time-interleaved full data rate army either in a box or a cross pattern (not sure yet) and adjust to where those offset ones reach a notably-but-limited BER, comparing the information in the digital domain (slow side).
```
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---
## message-1534302254075482184
**2026-08-04T20:49:23.329+00:00 โ Brunny (@brunny95)**
- Message ID: `1534302254075482184`
- Author ID: `693526428729344040`
- Nickname: Brunny
- User name: brunny95
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1534302254075482184
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**Content**
```text
Hi, I am checking a little bit this page: https://mithro.github.io/gf180mcu-project-template/
I have a question about the analog pins: would it be possible to have more using the standard pads? I see that we can have only 6 of them with the 0.5ร1 (Half Width)
Because we would like to have the chip on board packaging too
```
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---
## message-1534307980059869225
**2026-08-04T21:12:08.51+00:00 โ Tholin (@tholin)**
- Message ID: `1534307980059869225`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1534307980059869225
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
My next submission is going to be a entire analog die. So Iโm not going to need the LibreLane flow at all. I am going to do the routing to the pads myself, since I need the wires to be quite thick.
Not sure how to accomplish this. Iโll keep everyone updated on my progress.
```
**Reactions**
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---
## message-1534312011234807838
**2026-08-04T21:28:09.617+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1534312011234807838`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1534312011234807838
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1534302254075482184
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```text
I'm not 100% about the power pads, but analog/bidir/input can be changed in the template to whatever you want. You just can't change the pad position/size/number if you want to use the COB packaging.
Pretty sure you can change the power pads too, I don't think the COB pcb ties them together. but not 100% on that part
```
**Reactions**
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---
## message-1534315483904475158
**2026-08-04T21:41:57.566+00:00 โ Brunny (@brunny95)**
- Message ID: `1534315483904475158`
- Author ID: `693526428729344040`
- Nickname: Brunny
- User name: brunny95
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1534315483904475158
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
Honestly, if that was the case, it would not make sense to write down the number of bidir/analog/input pads and power pads inside the project template. But I would be very happy if this is the case ๐
```
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---
## message-1534316983565291641
**2026-08-04T21:47:55.113+00:00 โ Brunny (@brunny95)**
- Message ID: `1534316983565291641`
- Author ID: `693526428729344040`
- Nickname: Brunny
- User name: brunny95
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1534316983565291641
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1534307980059869225
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**Content**
```text
My idea would be to use the flow of librelane for the generation of the pads; if the pads are "free" a possible ideas would be to parallelize these standards pads, like using 2 or more pads for the same signal, and avoid to manually layout them.
```
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---
## message-1534564700904226986
**2026-08-05T14:12:15.529+00:00 โ tnt (@246tnt)**
- Message ID: `1534564700904226986`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1534564700904226986
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**Content**
```text
Did anyone look at the IOs drivers ? Are the final driver transistors nmos/pmos used as ESD diodes ? I don't see any separate ESD structures.
```
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---
## message-1534567408621322377
**2026-08-05T14:23:01.099+00:00 โ tnt (@246tnt)**
- Message ID: `1534567408621322377`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `ThreadCreated`
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**Reply/reference**
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**Content**
```text
Started a thread.
```
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---
## message-1534588263732609205
**2026-08-05T15:45:53.345+00:00 โ BreakingTaps (@polyfractal)**
- Message ID: `1534588263732609205`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1534588263732609205
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1534315483904475158
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```text
I can say from experience (Run1) and because I also did it for Run2: you can definitely change bidir/analog/input to whatever you want ๐ I think that page you found on Tim's github is just the result of a script that dumps out the default configs for comparison. I wouldn't read too much into it
```
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---
## message-1534603565421695208
**2026-08-05T16:46:41.552+00:00 โ Essen (@essen__)**
- Message ID: `1534603565421695208`
- Author ID: `509798510170865675`
- Nickname: Essen
- User name: essen__
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1534603565421695208
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1534315483904475158
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```text
Same understanding here, and as @BreakingTaps says you are free to do whatever you want and switch out they types between {analog/bidir/input} just keep the power pins in place for CoB packing.
```
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---
## message-1534604255216799924
**2026-08-05T16:49:26.012+00:00 โ Brunny (@brunny95)**
- Message ID: `1534604255216799924`
- Author ID: `693526428729344040`
- Nickname: Brunny
- User name: brunny95
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1534604255216799924
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
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```text
Great news guys, thanks a lot to both!
For the power pins, I have to check their current specifications, I hope they are fine
```
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---
## message-1535354391572389898
**2026-08-07T18:30:12.456+00:00 โ namibj**
- Message ID: `1535354391572389898`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1535354391572389898
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1534604255216799924
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```text
they're in the PDK on the page for that padring-member-class cell.
```
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---
## message-1536089526433353920
**2026-08-09T19:11:22.265+00:00 โ Tholin (@tholin)**
- Message ID: `1536089526433353920`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536089526433353920
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
https://cdn.discordapp.com/attachments/1148704591781843145/1536088828261961900/image.png?ex=6a7a21b3&is=6a78d033&hm=1b3649929bbef12f43b949979d36500a43156094f8b878ef615b10d7107f1a07&
```
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---
## message-1536089550131175485
**2026-08-09T19:11:27.915+00:00 โ Tholin (@tholin)**
- Message ID: `1536089550131175485`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536089550131175485
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**Content**
```text
Working comparator
```
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---
## message-1536120281662496849
**2026-08-09T21:13:34.883+00:00 โ Tholin (@tholin)**
- Message ID: `1536120281662496849`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536120281662496849
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**Content**
```text
O- oh!
```
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---
## message-1536122198459293736
**2026-08-09T21:21:11.883+00:00 โ tnt (@246tnt)**
- Message ID: `1536122198459293736`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536122198459293736
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**Content**
```text
Working oscillator?
```
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---
## message-1536128629828882473
**2026-08-09T21:46:45.241+00:00 โ Tholin (@tholin)**
- Message ID: `1536128629828882473`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536128629828882473
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**Content**
```text
Technically, yes
```
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---
## message-1536128700985384960
**2026-08-09T21:47:02.206+00:00 โ Tholin (@tholin)**
- Message ID: `1536128700985384960`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536128700985384960
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**Content**
```text
Now, "is it supposed to be an oscillator" is a different and no less interesting question entirely!
```
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---
## message-1536158241585762325
**2026-08-09T23:44:25.234+00:00 โ namibj**
- Message ID: `1536158241585762325`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536158241585762325
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**Content**
```text
I have a feeling the strong ARM latch with it's nominal/supposed output into an RS latch from which the stabilized output can then be recovered afterwards, would also work suitably for this task here, though ofc replacing the _strongly regenerative, made possible through clocked gain_ core of a strong ARM latch with a sufficciently weakly regenerative one that _just_ manages to provide the desired width of dead-band/hysteresis, and is then followed with a sufficcient quantity of differential gain stages to ensure it still correctly/properly operates the RS latch.
One would probably need to rely on CMOS inverter [-pair] (weakened by channel elongation to reduce bandwidth to what the following parts can actually utilize, and to curb power waste in that place, unless a current-starved-inverter style turns out to not break the regenerative core's operating principles) inputs in place of the strong ARM latch's natural nmos-diff-pair, but I doubt you need it to resolve double-hysteresis-flip signals (i.e., twice as much input amplitude as would be required to merely meet the input hysteresis, and where one would thus have a fairly weak but reasonably-above-noise-floor input signal) in under 2 ns (let's say 3ns given the use of 5V devices).
```
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---
## message-1536301232044507177
**2026-08-10T09:12:36.816+00:00 โ Tholin (@tholin)**
- Message ID: `1536301232044507177`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536301232044507177
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**Content**
```text
Are there any DRC rules dictating a maximum width for a single transistor?
```
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---
## message-1536301291935109204
**2026-08-10T09:12:51.095+00:00 โ Tholin (@tholin)**
- Message ID: `1536301291935109204`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536301291935109204
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**Content**
```text
Can I have one wide FET that stretches the entire width of the core area?
```
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---
## message-1536302470576472064
**2026-08-10T09:17:32.105+00:00 โ Tholin (@tholin)**
- Message ID: `1536302470576472064`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536302470576472064
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1534307980059869225
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```text
I am also still trying to figure out how to go about making an entirely analog die. Any suggestions, @Leo Moser (mole99) ? I want to do the whole core area by hand, only calling upon LibreLane for filler insertion and DRC checks.
```
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---
## message-1536303631765078048
**2026-08-10T09:22:08.954+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1536303631765078048`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536303631765078048
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
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- https://discord.com/channels/1361349522684510449/1408135265427394661/1536302470576472064
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```text
Well, for the first part you can either use magic or KLayout to draw the layout (I suppose that wasn't the question ๐), and for the second part you could use a custom LibreLane flow, either through the API or by modifying the flow through the config.
The [gf180mcu-precheck](https://github.com/wafer-space/gf180mcu-precheck) is basically just that: it first reads in a GDS into LibreLane's current state using a custom step, and then runs e.g. Magic.DRC and KLayout.DRC on it. In your case, you can also add filler generation.
```
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---
## message-1536305938326229092
**2026-08-10T09:31:18.881+00:00 โ Tholin (@tholin)**
- Message ID: `1536305938326229092`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536305938326229092
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
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The problem is that Iโd rather not have to figure out how to draw the padring and sealring by hand. I need a template. A gf180-analog-template, if you will :P
```
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---
## message-1536306043838275635
**2026-08-10T09:31:44.037+00:00 โ Tholin (@tholin)**
- Message ID: `1536306043838275635`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536306043838275635
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```text
I guess a LibreLane flow that aborts after just those steps?
```
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## message-1536307136286433330
**2026-08-10T09:36:04.497+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1536307136286433330`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536307136286433330
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
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```text
Now I understand! Yes that one already exists, you can find more information on running the flow in the project template README: https://github.com/wafer-space/gf180mcu-project-template#building-a-standalone-padring-for-analog-design
```
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---
## message-1536307660654252143
**2026-08-10T09:38:09.516+00:00 โ Tholin (@tholin)**
- Message ID: `1536307660654252143`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536307660654252143
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**Content**
```text
Idk how you manage to always be one step ahead
```
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## message-1536307677624401931
**2026-08-10T09:38:13.562+00:00 โ Tholin (@tholin)**
- Message ID: `1536307677624401931`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
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Thank you
```
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## message-1536310962561351801
**2026-08-10T09:51:16.752+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1536310962561351801`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536310962561351801
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```text
Haha, well, it's a common problem with analog designs.
You're welcome!
```
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---
## message-1536315073100914769
**2026-08-10T10:07:36.781+00:00 โ Tholin (@tholin)**
- Message ID: `1536315073100914769`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536315073100914769
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
I think Iโm going to go for a quarter slot this time and hope it gets squeezed into some spare space like some projects did on run 2.
```
**Reactions**
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---
## message-1536316043989884928
**2026-08-10T10:11:28.259+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1536316043989884928`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536316043989884928
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```text
If you have the time to create additional variations of your design, such as half-slot versions, chances are even higher.
```
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---
## message-1536316184914436209
**2026-08-10T10:12:01.858+00:00 โ Tholin (@tholin)**
- Message ID: `1536316184914436209`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536316184914436209
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**Content**
```text
That would be a lot of work since I am doing the whole layout by hand, but I can try
```
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## message-1536316400455520276
**2026-08-10T10:12:53.247+00:00 โ Tholin (@tholin)**
- Message ID: `1536316400455520276`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536316400455520276
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**Content**
```text
I probably can adapt it quite easily for half-slot, but Iโd feel bad taking up a full slot since this is a pretty simple circuit that is already going to have a lot of unused space on the quarter slot.
```
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## message-1536316405010665582
**2026-08-10T10:12:54.333+00:00 โ Tholin (@tholin)**
- Message ID: `1536316405010665582`
- Author ID: `220639106915368960`
- Nickname: Tholin
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I think
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## message-1536316542344765502
**2026-08-10T10:13:27.076+00:00 โ Tholin (@tholin)**
- Message ID: `1536316542344765502`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
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Most of the die area is going to be a big power FET, but I donโt expect it to be too large.
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## message-1536316590973386782
**2026-08-10T10:13:38.67+00:00 โ Tholin (@tholin)**
- Message ID: `1536316590973386782`
- Author ID: `220639106915368960`
- Nickname: Tholin
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```text
In typical fashion, I will fill the remaining area with art
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## message-1536316678772756491
**2026-08-10T10:13:59.603+00:00 โ Tholin (@tholin)**
- Message ID: `1536316678772756491`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536316678772756491
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Which should be easier this time since I donโt have to worry about keeping LibreLane out of trouble around the artworks.
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---
## message-1536317672323547177
**2026-08-10T10:17:56.484+00:00 โ v (@vaticori)**
- Message ID: `1536317672323547177`
- Author ID: `222533500941631489`
- Nickname: v
- User name: vaticori
- Type: `Reply`
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Are you also trying to submit this for Chipalooza?
```
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---
## message-1536317791009775666
**2026-08-10T10:18:24.781+00:00 โ Tholin (@tholin)**
- Message ID: `1536317791009775666`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536317791009775666
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
I donโt know what Chipalooza is
```
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---
## message-1536318629262401566
**2026-08-10T10:21:44.636+00:00 โ Leo Moser (mole99) (@mole99)**
- Message ID: `1536318629262401566`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536318629262401566
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
@Tim Edwards is hosting Chipalooza, see here for more: https://opencircuitdesign.com/chipalooza/
```
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---
## message-1536319823959556166
**2026-08-10T10:26:29.474+00:00 โ Tholin (@tholin)**
- Message ID: `1536319823959556166`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536319823959556166
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
Huh, interesting
```
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---
## message-1536319845891575880
**2026-08-10T10:26:34.703+00:00 โ Tholin (@tholin)**
- Message ID: `1536319845891575880`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536319845891575880
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
But does look a lot more is involved there
```
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---
## message-1536319924153356338
**2026-08-10T10:26:53.362+00:00 โ Tholin (@tholin)**
- Message ID: `1536319924153356338`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536319924153356338
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
Like, I see a bunch of review steps
```
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---
## message-1536353858425585727
**2026-08-10T12:41:43.923+00:00 โ Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1536353858425585727`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536353858425585727
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
You can handle it! Anyway, Chipalooza for GF will launch in a week and I will announce on the Wafer.Space discord.
```
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---
## message-1536354810302038116
**2026-08-10T12:45:30.868+00:00 โ Tholin (@tholin)**
- Message ID: `1536354810302038116`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Edited: 2026-08-10T12:45:39.878+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536354810302038116
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
Iโm reading the FAQ right now. So, I need to make a layout that is integrated onto a multi-project die?
```
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---
## message-1536355016703742023
**2026-08-10T12:46:20.078+00:00 โ Tholin (@tholin)**
- Message ID: `1536355016703742023`
- Author ID: `220639106915368960`
- Nickname: Tholin
- User name: tholin
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536355016703742023
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Content**
```text
Hmmm, not sure what Iโm building now is suitable, then, but I can maybe take some of its component modules and do something with those.
```
Other message metadata
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---
## message-1536374922643902545
**2026-08-10T14:05:26.024+00:00 โ namibj**
- Message ID: `1536374922643902545`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536374922643902545
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1536305938326229092
Reference data
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**Content**
```text
KLayout has them as PCells.
Well, the sealring; you could also take a template GDS and flatten and delete everything but the top metal/pad-opening structures from inside the sealring, leaving only the literal pads themselves (I'd suggest considering to keep the existing via structure of how the pad electrical connection is escaped downwards, as there are some minor DRC aspects around the interaction between (especially upper-level) vias and pads if those pads are wedge-bonded (like all of Run1 has been)
```
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---
## message-1536375611214274742
**2026-08-10T14:08:10.192+00:00 โ namibj**
- Message ID: `1536375611214274742`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1408135265427394661/1536375611214274742
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/analog/2026-08/2026-08.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1408135265427394661/1536302470576472064
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```text
For the record, `FC01` was done entirely in KLayout using the IEEE Chipathon docker tag.
Took me a few tries to get the coordinate origin and exact precise size of the pad ring right, but that was it.
```
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---