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Strange Error in post-simulation using pex netlist & Spectre

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James.Edward

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Hello,

Something strange happened in my post-simulation:
two cascade PMOS current sources are symmetrical in both schematic and layout, however the voltages at the same node in two branches are different.

1_1307601524.jpg


As shown in the picture, the voltage of node A is 1mV higher than that of node B.
So the values of output VCM and VDM are wrong.
How could this happen ?
 

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