open-source-silicon.dev

<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/329|#329 Support for ESD devices>
Pull request opened by <https://github.com/KrzysztofHerman|KrzysztofHerman>
This PR provides support for ESD devices. The following elements are added:

1. Xschem symbols
2. Xschem testcases (for `ngspice` and `Xyce`)
3. Ngspice library `sg13g2_esd.lib`
4. Xyce library `sg13g2_esd.lib`
5. Layouts of the `fixed` devices can be found in `$PDK_ROOT/$PDK/libs.res/sg13g2_pr/gds/sg13g2_pr.gds`
6. Respective pycells will be added soon.

The supported devices are shown on the following image:

<https://private-user-images.githubusercontent.com/141824113/402063635-19af177d-b22c-4063-b27e-6f0898b77e1f.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MzY5MzQ4MDAsIm5iZiI6MTczNjkzNDUwMCwicGF0aCI6Ii8xNDE4MjQxMTMvNDAyMDYzNjM1LTE5YWYxNzdkLWIyMmMtNDA2My1iMjdlLTZmMDg5OGI3N2UxZi5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMTE1JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDExNVQwOTQ4MjBaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT0wYjdhYzE1ZmY3YzQzM2QzMzUwMGU4ZTFhZGIzNDQ4MzEyZWRlNDYyOGI3ZTBjMjMyM2IwYTY5YTI0YWM2NTBmJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.CzQYQFl3etMakG8v28RYhI-zu4ZI2Z33U2P5M-baBtU|image>

More info about the devices can be found <https://ihp-open-pdk-docs.readthedocs.io/en/latest/verification/lvs/04_07_esd.html|here>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>

<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/329|#329 Support for ESD devices>
Pull request merged by <https://github.com/sergeiandreyev|sergeiandreyev>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>

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