---
page_id: wsd-missing-noise-models-in-pmos-33v-5v-88368f6e
type: context-page
schema_version: 1
template_id: discord-page
template_version: template-0.1.0
title: "Thread: Missing noise models in PMOS (3.3V & 5V-6V)"
slug: wsd-missing-noise-models-in-pmos-33v-5v-88368f6e
route: /evidence/i-information/questions/threads/missing-noise-models-in-pmos-33v-5v
section: reference
access: public
summary: 12 Discord messages from ℹ️ - Information/⁉️-questions/threads/missing-noise-models-in-pmos-33v-5v.md.
status: published
asset_base: .
home_href: /
md_url: /evidence/i-information/questions/threads/missing-noise-models-in-pmos-33v-5v.md
toc_enabled: true
talk_enabled: false
agent_view_enabled: true
copy_buttons_enabled: true
footer_enabled: true
search_indexed: true
tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
talk_url: /evidence/i-information/questions/threads/missing-noise-models-in-pmos-33v-5v.talk.md
talk_route: /evidence/i-information/questions/threads/missing-noise-models-in-pmos-33v-5v/talk
---

# Thread: Missing noise models in PMOS (3.3V & 5V-6V)

Category: **ℹ️ - Information**
Parent channel: **#⁉️-questions**
Thread ID: `1501344740350758992`

Messages: **12**

## message-1501344740350758992

**2026-05-05T22:07:59.736+00:00 — Brandon Hippe (@hipstair)**

- Message ID: `1501344740350758992`
- Author ID: `254391919029780480`
- Nickname: Brandon Hippe
- User name: hipstair
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1501344740350758992
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

```text
I'm running Gm/Id sweeps for analog design, specifically using the 3.3V transistors (and possibly 5V/6V as well), and not getting any noise for PMOS models (onoise_total id and 1overf both return 0). This is not the case for the NMOS models. Has anyone else ran into this before?
```

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/0c7b47fefe6b72f9f3904511072e8b85-D1BBA.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
```

</details>

---

## message-1501531544391782522

**2026-05-06T10:30:17.29+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1501531544391782522`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1501531544391782522
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

```text
@Tim Edwards - Any ideas?
```

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/9679bb77da48d47c905b398d98a83780-75B68.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {
    "mentions": [
      {
        "avatarUrl": "2026-05_media/6bcc8e61db497b620550682309ace5d5-D89B4.png",
        "color": null,
        "discriminator": "0000",
        "id": "1365118310701600900",
        "isBot": false,
        "name": "rtimothyedwards_19428",
        "nickname": "Tim Edwards",
        "roles": []
      }
    ]
  }
}
```

</details>

---

## message-1501573995613519903

**2026-05-06T13:18:58.45+00:00 — Tim Edwards (@rtimothyedwards_19428)**

- Message ID: `1501573995613519903`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1501573995613519903
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

```text
No, not really.  That's the first time I've heard of it.
```

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/6bcc8e61db497b620550682309ace5d5-D89B4.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
```

</details>

---

## message-1501733983447416972

**2026-05-06T23:54:42.522+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1501733983447416972`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1501733983447416972
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

```text
@Tim Edwards - Any idea of other people who might have done stuff using the noise models?
```

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/9679bb77da48d47c905b398d98a83780-75B68.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {
    "mentions": [
      {
        "avatarUrl": "2026-05_media/6bcc8e61db497b620550682309ace5d5-D89B4.png",
        "color": null,
        "discriminator": "0000",
        "id": "1365118310701600900",
        "isBot": false,
        "name": "rtimothyedwards_19428",
        "nickname": "Tim Edwards",
        "roles": []
      }
    ]
  }
}
```

</details>

---

## message-1501738345145962576

**2026-05-07T00:12:02.432+00:00 — Tim Edwards (@rtimothyedwards_19428)**

- Message ID: `1501738345145962576`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1501738345145962576
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

```text
We did essentially zero analog stuff for the two MPW runs at Efabless.  The one thing I can think of is the last Chipathon, which was run on GF180MCU and had some analog projects.  For that, the best people to ask would be Mehdi Saligane, Mitch Bailey, and Peter Kinget.
```

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/6bcc8e61db497b620550682309ace5d5-D89B4.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
```

</details>

---

## message-1501769130909503498

**2026-05-07T02:14:22.33+00:00 — bailey (@bailey8889)**

- Message ID: `1501769130909503498`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1501769130909503498
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

```text
I asked on Element.
```

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/0-EB806.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
```

</details>

---

## message-1501945679898087444

**2026-05-07T13:55:54.889+00:00 — Christoph (@christoph_36502)**

- Message ID: `1501945679898087444`
- Author ID: `1340064544567070720`
- Nickname: Christoph
- User name: christoph_36502
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1501945679898087444
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

```text
For me it does work just fine using ngspice.
```

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/8f2f2e5b02fa09674ff1e308e6ddd24f-2EEA5.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
```

</details>

---

## message-1502121968621846540

**2026-05-08T01:36:25.396+00:00 — namibj**

- Message ID: `1502121968621846540`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1502121968621846540
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Reply/reference**
- https://discord.com/channels/1361349522684510449/1501344740350758992/1501945679898087444
<details>
<summary>Reference data</summary>

```json
{
  "channelId": "1501344740350758992",
  "guildId": "1361349522684510449",
  "messageId": "1501945679898087444"
}
```

</details>

**Content**

```text
@Brandon Hippe if you can share a testbench of that sort with @Christoph , he can probably verify if it works for him.
Also, @Christoph might be so kind as to share a testbench + PDK revision hash + ngspice version + ngspice user/system config that "works for him".
```

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/f885abc0dddd0a33e4d4991b3c99091d-7ACD2.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {
    "mentions": [
      {
        "avatarUrl": "2026-05_media/0c7b47fefe6b72f9f3904511072e8b85-D1BBA.png",
        "color": null,
        "discriminator": "0000",
        "id": "254391919029780480",
        "isBot": false,
        "name": "hipstair",
        "nickname": "Brandon Hippe",
        "roles": []
      },
      {
        "avatarUrl": "2026-05_media/8f2f2e5b02fa09674ff1e308e6ddd24f-2EEA5.png",
        "color": null,
        "discriminator": "0000",
        "id": "1340064544567070720",
        "isBot": false,
        "name": "christoph_36502",
        "nickname": "Christoph",
        "roles": []
      }
    ]
  }
}
```

</details>

---

## message-1502349320123453545

**2026-05-08T16:39:50.218+00:00 — Brandon Hippe (@hipstair)**

- Message ID: `1502349320123453545`
- Author ID: `254391919029780480`
- Nickname: Brandon Hippe
- User name: hipstair
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1502349320123453545
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

```text

```

**Attachments**

- Resolved media URL: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05_media/sweep-C3381.spice
<details>
<summary>Attachments data</summary>

```json
[
  {
    "fileName": "sweep.spice",
    "fileSizeBytes": 2272,
    "id": "1502349320047952113",
    "url": "2026-05_media/sweep-C3381.spice"
  }
]
```

</details>

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/0c7b47fefe6b72f9f3904511072e8b85-D1BBA.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
```

</details>

---

## message-1502349409482965202

**2026-05-08T16:40:11.523+00:00 — Brandon Hippe (@hipstair)**

- Message ID: `1502349409482965202`
- Author ID: `254391919029780480`
- Nickname: Brandon Hippe
- User name: hipstair
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1502349409482965202
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

```text
This is the spice file I'm running
```

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/0c7b47fefe6b72f9f3904511072e8b85-D1BBA.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
```

</details>

---

## message-1503364447035719741

**2026-05-11T11:53:35.334+00:00 — Christoph (@christoph_36502)**

- Message ID: `1503364447035719741`
- Author ID: `1340064544567070720`
- Nickname: Christoph
- User name: christoph_36502
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1503364447035719741
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

```text
Try to reduce it first to a simple simulation without all the loops. Also your save statements inside the control block should not be prefixed by "." and be stated before the simulation command.
```

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/8f2f2e5b02fa09674ff1e308e6ddd24f-2EEA5.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
```

</details>

---

## message-1503365064902578216

**2026-05-11T11:56:02.645+00:00 — Christoph (@christoph_36502)**

- Message ID: `1503365064902578216`
- Author ID: `1340064544567070720`
- Nickname: Christoph
- User name: christoph_36502
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1501344740350758992/1503365064902578216
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/missing-noise-models-in-pmos-33v-5v/2026-05/2026-05.json

**Content**

````text
Here is what my working control section looks like:

```
.control
save all
noise v(out,vss) vin dec 10 100 1e6 1
print inoise_total
print all
setplot noise1
gnuplot p1 inoise_spectrum
.endc
```
````

<details>
<summary>Other message metadata</summary>

```json
{
  "author": {
    "avatarUrl": "2026-05_media/8f2f2e5b02fa09674ff1e308e6ddd24f-2EEA5.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
```

</details>

---