The bandwidth of the main amplifier and the common mode feedback amplifier

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luckypearl25

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IS there a relationship or rule between the bandwidth of the main amplifier and the common mode feedback amplifier, which is to be followed such than a differential amplifier has good common mode stability .i.e should the cmfb opamp's wu must be greater than that of the main amp's wu or somethinglike tat
 

Re: BW constraints

i have ever read that the bandwidth of common-mode loop should be close to or larger than that of differential-mode loop in a paper for good common-mode settling and stability.
 

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