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Differential input pair's ramdom offset voltage caculate

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allan_guo

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The random offset voltage of the input composed of delta(Vth)、delta(W&L) and delta(ID),but how to caculate the influnence of the delta(ID)?when M3&M4 are replaced by resistors,then we can get delta(ID) by delta(R).in the case of mos transistors, how to caculate?Is it right to assume V(A)=V(B),and then use the delta(Vth) and delta(W&L) of M3&M4 to express the delta(ID) cased by the offset of M3&M4?
 

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