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question about Fully Differential amplifier

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artho

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Hi,

I'm a beginner in analog design. I'm designing a fully differential amplifier and i want to know what is the gain of the CMFB amplifier that makes the FD op amp operates properly. I'm using a ideal CMFB(VCVS) for this, but i don't know what is the proper gain that i have to give to this amplifier. My purpose is to design the FD amplifier with a ideal CMFB(with the proper gain) and then design the CMFB based on this gain.

Thanks.
 

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