What is cmfb in analogical circuits?

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cmfb

CMFB is a circuitry to determine the common-mode voltage, expecially for high-impedance node and control it to work properly. You can find some circuits in "anlog integrated circuit design" by David Johns.
 

cmfb

it bias the circuit in an correct working region
 

Re: cmfb

CMFB circuit is needed in fully differential circuit like fully differential OP.

In many fully differential circuit, its output is high impedance and no DC bias is here. So you need CMFB circuit to stablize it.

Yibin.
 

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