Hi,
I have question regarding chopper modulation technique. As in the attached figure, it shows chopper technique application in simple CMOS amplifier. However, here the demodulation is done right before the second stage, not after the 2nd stage common source amplifier.
As we have known, most contribution of noise comes from the input differential amp, and the single ended conversion current mirror. My question is, how do we know that demodulation is done after the current mirror, and thus flicker noise contribution from them is totally removed.