KLayout PyCells: Guard Ring

[martinjankoehler]

• adds dedicated standalone guard ring cell
• adds guard ring feature to existing cells
• add xschem symbol + schematic for ptap/ntap with guard ring added

---

• Tests pass
• Appropriate changes to README are included in PR

[d-m-bailey]

@martinjankoehler the first pull request that I made failed CI with the same error. These are the instructions that I was given.

you need to sign-off your commits. In the future, use git commit -s ... to automatically add your signed-off-by. For now, run git rebase --signoff HEAD~2 to sign-off your existing two commits.

I only had 2 commits. It looks like you might have more that need to be signed.

[martinjankoehler]

@KrzysztofHerman @sergeiandreyev now Signed off

@d-m-bailey Thanks

[KrzysztofHerman]

@martinjankoehler

Thank you for this contribution. I have not been testing yet the LVS of the cells wit the instantiated guard ring so I will ask directly if the symbols for xschem generate a valid netlist entries to be compared with the extracted ptap1/ntap1 devices. I guess the devices with guard ring are recognized during LVS extraction as device + ptap1/ntap1 respectively.

[martinjankoehler]

@martinjankoehler

Thank you for this contribution. I have not been testing yet the LVS of the cells wit the instantiated guard ring so I will ask directly if the symbols for xschem generate a valid netlist entries to be compared with the extracted ptap1/ntap1 devices. I guess the devices with guard ring are recognized during LVS extraction as device + ptap1/ntap1 respectively.

Yes, @p-fath successfully tested LVS.