Implement method of splitting substrate into local islands (using `DigiSub`)

IHP-GmbH / IHP-Open-PDK

130nm BiCMOS Open Source PDK, dedicated for Analog, Mixed Signal and RF Design

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Implement method of splitting substrate into local islands (using `DigiSub`) #86

Open hpretl opened 6 months ago

hpretl commented 6 months ago

In a typical IC design, different VSS nets are used in different areas for blocks requiring isolation (e.g., digital blocks vs. analog blocks), leading to p-taps shorting these VSS nets via the (common) substrate node if no measures are taken.

A common method is to split the substrate into local VSS islands using a marking layer to circumvent these problems.

In SG13G2 this marking layer is called DigiSub. Please support this layer in LVS and PEX.

sergeiandreyev commented 6 months ago

Hello @hpretl , could you please confirm that with the latest LVS update this enhancement is implemented?

hpretl commented 6 months ago

Hi @sergeiandreyev I can check, but this will take quite a while.