open-source-silicon.dev

<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/399|#399 ESD devices>
Pull request opened by <https://github.com/KrzysztofHerman|KrzysztofHerman>
This PR provides ESD device support, in details `ESD diodes` and `nmos` clamps

• xschem symbols and examples
• spice models for ngspice and Xyce
• klayout PyCell code for device generation

The devices are the following:

• ESD VDD diodes `diodevdd_2kv` and `diodevdd_4kv`
• ESD VSS diodes `diodevss_2kv` and `diodevss_4kv`
• ESD nmos clamps `nmoscl_2` and `nmoscl_4`

Xschem symbols:

<https://private-user-images.githubusercontent.com/141824113/424933364-0f261dc4-2605-46e9-bbe5-0fbabce4e05d.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NDI4NDgwMTksIm5iZiI6MTc0Mjg0NzcxOSwicGF0aCI6Ii8xNDE4MjQxMTMvNDI0OTMzMzY0LTBmMjYxZGM0LTI2MDUtNDZlOS1iYmU1LTBmYmFiY2U0ZTA1ZC5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMzI0JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDMyNFQyMDIxNTlaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1hMzJlZDI1NzAxZWM1NTc2YTE2Y2I4MGUwYjU5YjA5YTljYTRjMmIzMGNlODA0MjNlMGYwYTdhY2I2Y2ExYzczJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.ffJoHRyk5dJq_YXn-X56-VRfM3pp4nXkQ3AhJQ7rRYY|[image](https://private-user-images.githubusercontent.com/141824113/424933364-0f261dc4-2605-46e9-bbe5-0fbabce4e05d.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NDI4NDgwMTksIm5iZiI6MTc0Mjg0NzcxOSwicGF0aCI6Ii8xNDE4MjQxMTMvNDI0OTMzMzY0LTBmMjYxZGM0LTI2MDUtNDZlOS1iYmU1LTBmYmFiY2U0ZTA1ZC5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMzI0JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDMyNFQyMDIxNTlaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1hMzJlZDI1NzAxZWM1NTc2YTE2Y2I4MGUwYjU5YjA5YTljYTRjMmIzMGNlODA0MjNlMGYwYTdhY2I2Y2ExYzczJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.ffJoHRyk5dJq_YXn-X56-VRfM3pp4nXkQ3AhJQ7rRYY)>

Device layouts:  
<https://private-user-images.githubusercontent.com/141824113/424935657-fae6d5ad-c798-44bf-9101-d9a2bc32b8dc.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NDI4NDgwMTksIm5iZiI6MTc0Mjg0NzcxOSwicGF0aCI6Ii8xNDE4MjQxMTMvNDI0OTM1NjU3LWZhZTZkNWFkLWM3OTgtNDRiZi05MTAxLWQ5YTJiYzMyYjhkYy5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMzI0JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDMyNFQyMDIxNTlaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT05NDRiYTdjZDA4OGFlZGMyMmU1MzA2YWNmNjQ0ZjRmMGU1NjYzNDE0NjFiYTg0M2YwOTk1M2UyZWUzNjBmMWE5JlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.MMVtHkjUnOzYEusZE0V650YYcl7E1KzYSezZmX2zdH4|[image](https://private-user-images.githubusercontent.com/141824113/424935657-fae6d5ad-c798-44bf-9101-d9a2bc32b8dc.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NDI4NDgwMTksIm5iZiI6MTc0Mjg0NzcxOSwicGF0aCI6Ii8xNDE4MjQxMTMvNDI0OTM1NjU3LWZhZTZkNWFkLWM3OTgtNDRiZi05MTAxLWQ5YTJiYzMyYjhkYy5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMzI0JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDMyNFQyMDIxNTlaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT05NDRiYTdjZDA4OGFlZGMyMmU1MzA2YWNmNjQ0ZjRmMGU1NjYzNDE0NjFiYTg0M2YwOTk1M2UyZWUzNjBmMWE5JlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.MMVtHkjUnOzYEusZE0V650YYcl7E1KzYSezZmX2zdH4)>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>

<https://github.com/IHP-GmbH/IHP-Open-PDK/pull/399|#399 ESD devices>
Pull request merged by <https://github.com/sergeiandreyev|sergeiandreyev>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>