open-source-silicon.dev

<https://github.com/IHP-GmbH/IHP-Open-PDK/issues/463|#463 Questions about HBT Layout>
Issue created by <https://github.com/EngGhaith|EngGhaith>
Hi!  
I found this section in the documentation and have some questions about that:

<https://private-user-images.githubusercontent.com/178785944/437784556-bbc1c79c-414a-4388-aaee-84f9d57ecf43.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NDU5MTczNDIsIm5iZiI6MTc0NTkxNzA0MiwicGF0aCI6Ii8xNzg3ODU5NDQvNDM3Nzg0NTU2LWJiYzFjNzljLTQxNGEtNDM4OC1hYWVlLTg0ZjlkNTdlY2Y0My5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwNDI5JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDQyOVQwODU3MjJaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT0yMTM2ODcwNzk2Zjk2OTY1YzJhNTA0MjNmYzEwYmNkOTBjMDQxMTNmMzllYjhhMjJhN2YwZjg5N2EyOTFkNDlmJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.zqpGxPEh_gyZ8MBSte4V20Li5w-YtvIzN3UPqygEipQ|[Image](https://private-user-images.githubusercontent.com/178785944/437784556-bbc1c79c-414a-4388-aaee-84f9d57ecf43.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NDU5MTczNDIsIm5iZiI6MTc0NTkxNzA0MiwicGF0aCI6Ii8xNzg3ODU5NDQvNDM3Nzg0NTU2LWJiYzFjNzljLTQxNGEtNDM4OC1hYWVlLTg0ZjlkNTdlY2Y0My5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwNDI5JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDQyOVQwODU3MjJaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT0yMTM2ODcwNzk2Zjk2OTY1YzJhNTA0MjNmYzEwYmNkOTBjMDQxMTNmMzllYjhhMjJhN2YwZjg5N2EyOTFkNDlmJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.zqpGxPEh_gyZ8MBSte4V20Li5w-YtvIzN3UPqygEipQ)>

Let us take this transistor as example:

<https://private-user-images.githubusercontent.com/178785944/437786613-605bc07a-5d5c-4bfb-a217-5e61b44861ce.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NDU5MTczNDIsIm5iZiI6MTc0NTkxNzA0MiwicGF0aCI6Ii8xNzg3ODU5NDQvNDM3Nzg2NjEzLTYwNWJjMDdhLTVkNWMtNGJmYi1hMjE3LTVlNjFiNDQ4NjFjZS5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwNDI5JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDQyOVQwODU3MjJaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1kMGNmY2ZiYTA1ODY0NGYxNWM1NTIxMTlhZTcyMTY0NDEzYjNiZDhkY2Q1ZmNjZWYxYTQyMDM3NzEzYjc4YTZhJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.ZKHPBH8Oz-bg116YRYYKmP9OlC5UD3t1CiCV712NP8E|[Image](https://private-user-images.githubusercontent.com/178785944/437786613-605bc07a-5d5c-4bfb-a217-5e61b44861ce.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3NDU5MTczNDIsIm5iZiI6MTc0NTkxNzA0MiwicGF0aCI6Ii8xNzg3ODU5NDQvNDM3Nzg2NjEzLTYwNWJjMDdhLTVkNWMtNGJmYi1hMjE3LTVlNjFiNDQ4NjFjZS5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwNDI5JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDQyOVQwODU3MjJaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1kMGNmY2ZiYTA1ODY0NGYxNWM1NTIxMTlhZTcyMTY0NDEzYjNiZDhkY2Q1ZmNjZWYxYTQyMDM3NzEzYjc4YTZhJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.ZKHPBH8Oz-bg116YRYYKmP9OlC5UD3t1CiCV712NP8E)>

1. Rule says that we are only allowed to use metals in the TRANS region. Are vias also allowed?
2. Are not we allowed to route in red hatched region even for metal 2? or only metal 1?
3. Which of these connections between B and C (Yellow/Pink/Both) are allowed (Both yellow and pink are on Metal 1 layer)?
4. Are these bipolar rules existed in KLayout-DRC or not? i.e. If DRC is clean, should the design be OK or not?

Thank you in advance.  
Ghaith.
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>

<https://github.com/IHP-GmbH/IHP-Open-PDK/issues/463|#463 Questions about HBT Layout>
Issue closed as completed by <https://github.com/EngGhaith|EngGhaith>
<https://github.com/IHP-GmbH/IHP-Open-PDK|IHP-GmbH/IHP-Open-PDK>