subgold
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hi,
i think the cm input level is not correctly defined, there is no way to get the right equation for the calculation.
try to replace the voltage source in the feedback by a vdc source with vdc=0, do the same stb simu for Av, and use Vout/Vcm=(Av+Vc/2)/(Av-Vc/2) for Ac with ac/xf simu.
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