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question on post layout sim

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zjrlgf

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it is a ask_detector schematic, the layout is also drawn(umc18)
then use two tools to extract and post simulate it, assura and calibre

The post simu result of assura is similar to schematic result.
while the calibre result differs a lot to schematic result .

i don't know which one to trust, can anyone give me some help, thanks!
 

Ask your foundry which tool is their sign-off tool. In my experience with post-layout simulations, the netlist extracted from Calibre RCX needed some tuning. Some devices are not extracted correctly with the right value, especially BJT.
 

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