dog1
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@Vray, I might misunderstand you, but are you saying the figure you attached is not good and we should go for only one CMFB for the first stage?
I disagree with you in that case. In the figure attached, due to feedback, the CM of the output of 2nd stage is fixed, thus the CM of the output of the first stage is fixed by default. Of course, by design, it should be made sure that this CM ensures that all the transistors of the 1st stage are in saturation.
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