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Thread: Are there SPICE models for pwell resistors?

3 Discord messages from ℹ️ - Information/⁉️-questions/threads/are-there-spice-models-for-pwell-resistors.md.

Category: ℹ️ - Information Parent channel: #⁉️-questions Thread ID: 1513073805289848942

Messages: 3

message-1513073805289848942

2026-06-07T06:55:06.733+00:00 — were491 (@were491.)

Content

Just saw that [this page](https://mithro-gf180mcu-pdk.readthedocs.io/en/latest/physical_verification/design_manual/drm_15.html) of the PDK mentions a p-well resistor alongside the n-well resistor. I couldn't find the schematic symbol or model by grepping inside the tech, so I'm curious if there actually is one.

-- Not actually planning on using them, I'm just curious.

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message-1513436381781950605

2026-06-08T06:55:51.705+00:00 — Leo Moser (mole99) (@mole99)

Content

Unfortunately, I don't think it is part of the PDK.

The resistors page does not list it: https://gf180mcu-pdk.readthedocs.io/en/latest/analog/model_parameters/LV/LV_1_4_4.html

Looking at the spice models in the PDK (`sm141064.spice`), I can see that they only include the ones shown on the resistors page.

Magic, however, does extract resistance for pwell/isosub during pex.

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message-1513519174670876692

2026-06-08T12:24:51.068+00:00 — were491 (@were491.)

Content

thanks :)

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