[SOLVED] Strange mismatch between layout & schematics (AMS 0.35 HV)

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K4R1

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Hello,

Routing some nmos20t in 0,35 HV, i got a very strange parameters mismatch between the layout and schematic, where there should be none. My LVS error report tells me that their is a mismatch of 20% which is completely impossible since the schematic transistor and layout transistor have the same parameter. I'm enclosing a screenshot to picture the problem, if anyone can help me please !!!



the twisted thing is that i have re-imported the layout of this MOS to make sure it has been correctly "translated" and i also already layouted a same mos before with no problem... But this time, it seems to not be happy.

K4R1
 

Hello,

Fix the net errors first.
Sometimes wiring errors affect transistor parameters.
 

Ok, I'm looking at it right now... Besides, what's the purpose of the "psub" pin ? Where it should go ? It seems to make me short cut wherever i pin it....

Thanks for your time
 

Ok, i solved it... It was very tricky but obvious. You can't pin "mosN20t" with "mosi20t" !!

So to fix this, i simply separated the bulk polarization and joined them where it was needed. Have a glance at the image enclosed to the message...

 

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