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issue in extract netlist by Calibre xRC

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yingt2704

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ad=0 and pd=0 when extract netlist with RC by Calibre xRC @ the mos drain and source connected together. however as& ad have the correct value.
why can that be? Could anyone can give me the explaination? Thanks!
 

yingt2704 said:
ad=0 and pd=0 when extract netlist with RC by Calibre xRC @ the mos drain and source connected together. however as& ad have the correct value.
why can that be? Could anyone can give me the explaination? Thanks!
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"ad=0" and "ad have the correct value" is a contradictio in adiecto, so it's probably a typo, I guess (and you thought of "as & ps have the correct value"?)

For some irregular but - concerning source & drain - symmetric MOS structures, some extraction rules just extract area and periphery of (e.g.) the source, double these values and set ad & pd =0 , which still leads to a correct capacitances' calculation. Just check your exraction rules.

See also this topic, and perhaps this one for ring or waffle MOS structures.
 
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