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[SOLVED] about operation input offset cancel

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andy2000akimo

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some paper talk about auto zero, or chopper , but in analog IC
if use auto zero ..

how about auto zero signal clock ?? if op amp input 0~100mv very small .
and signal < 1Khz .. auto zero clock can use 100Khz ?

other problem is output signal need low pass filter , but low frequency clock
also need very large Cap for filter it , if I use pass R-C , vout will small than input
if I want to design unit gain op amp with ultra small offset and low frequency signal , which type auto zero can be use ?
 

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