Klayout LVS doesn’t extract floating N-FET body tap

[StanleyAlwaysLoveYou]

Expected Behavior

The Klayout should extract all four terminals of the NFET layout when running LVS

Actual Behavior

No body terminal shows in the extracted netlist from klayout

Reproducing process

• The layout of 1 PFET and 1NFET

• Extraction result from Klayout, note the lack of “NBODY”. Instead, Klayout assumes that all NFET bodies are tied to the global ground node.

Affect

This can lead to potential latch-up. Cadence flagged this as a soft check error.

[StanleyAlwaysLoveYou]

@andylithia @msaligane FYI

[msaligane]

Have you opened a Github issue for this? @proppy @mithro