ontheverge
Junior Member
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Posts: 31
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Hi ,
I came across one cmfb ckt and have a few quesitons, can someone pls gives some thoughts?
1. why is Vb involved in cmfb ckt? 2. if there is a reason for the existence of Vb here, based on charge conservation on topplate of c1(topone): Q=(Vcm-Vb)*c1=(Vop-Vcmfb)*(c1+c2), seems Vcmfb can be set by this eq. alone (without Von). so am I missing anything or this ckt is flawed?
thanks,
Steve
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