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ytliang said:I(M1)+I(M2)=2IB
I am guessing M1=M2...
Then I(M1)=I(M2)=IB
Hence, Vin = VGS1 = VGS2 = VDS2 = Vout
ytliang said:From the Equation gm1/gm2 = sqrt((w/l1)/(w/l2)). It means I(m1) = I(m2) so they are canceled out.
I think a better question would be why does I(m1) = I(m2)...
Are you sure Vout = Vin for different sizing of the transistors?