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How to simulate input offset of chopper amplifier

abed

 How does one simulate input offset of chopper amplifier?
I have configured the chopper amplifier with a gain of 50.My chopping frequency is 5KHz.I am running a transient analysis for 1m and then taking the average of the output after the demodulator.Is this method correct?
I have read on net that chopper offset can be measured using PSS and its more accurate.But I don't know how to do that.Can somebody help me with the simulations?

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