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Guild: wafer.space Community
Channel: 📐 - Designing / 🕰️-analog / thyristor port from SG13G2
After: 2026-08-31 11:59 p.m.
Before: 2026-10-01 12:00 a.m.
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[2026-09-17 1:18 a.m.] namibj



[2026-09-17 1:18 a.m.] namibj
IHPs SG13G2 magic Pcells include this structure which doesn't actually come with any parameters to adjust and doesn't appear to have any notable further documentation I could realistically find; it supposedly has some care to it for LVS&DRC to go through in some sort of acceptable manner... but that's it.

As far as I understand it's a symmetric floating latching structure, some kind of DIAC I suppose; it's for ESD protection I think.
The bottom is symmetric.
One side is metal via'd up to one higher metal terminal; same for the other.

It's all encased in DNWELL (they call it nBuLay as it's also relevant for the SiGe HBT's the G2 process offers). It's also all thick oxide.
I disabled visibility of those layers for I hope obvious reasons.


[2026-09-17 1:24 a.m.] namibj
I _think_ we should have all the doping layers needed on gf180mcuD to copy this structure for a coming e-test die; I'd hope we might have someone who knows somewhat more about the subject matter though or how to perhaps tcad the thankfully "just" 2D cross-section slice.
Luckily this could be modeled as just 3 electrodes (substrate plus the two obvious metal zones shorting the two contact areas and the corresponding gate poly together) of differing potential; not sure if Xyce's TCAD functionality allows the electrodes to be so split though... and of non-same material.


[2026-09-23 12:54 a.m.] mithro_
@namibj - I believe KLayout can generate cross section diagrams...

https://github.com/klayoutmatthias/sky130_xsection

https://github.com/gdsfactory/klayout_pyxs

{Embed}
https://github.com/klayoutmatthias/sky130_xsection
GitHub - klayoutmatthias/sky130_xsection: KLayout XSection script f...
KLayout XSection script for Skywater 130 process. Contribute to klayoutmatthias/sky130_xsection development by creating an account on GitHub.
2026-09_media/sky130_xsection-B4A98

{Embed}
https://github.com/gdsfactory/klayout_pyxs
GitHub - gdsfactory/klayout_pyxs: Python port of xsection script fo...
Python port of xsection script for KLayout. Contribute to gdsfactory/klayout_pyxs development by creating an account on GitHub.
2026-09_media/klayout_pyxs-D3811


[2026-09-23 1:19 p.m.] namibj
I'll try not sure though if it'll represent the doping patterns, I recal it not ding that when I think I already tried this.


[2026-09-23 11:40 p.m.] mithro_
Afraid the is beyond the limits of my knowledge.


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