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2 Stage Op-amp CMFB Realization

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Shady Ahmed

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https://www.edaboard.com/threads/287434/#post1229687


I am building a 2 stage op-amp similar to that in the thread referenced. Mu question is about the CMFB, the solution in that thread is implemented using IDEAL voltage controlled voltage source, now if i want to realize it on transistor level, what should i do? or should i implement another CMFB technique? what may that be?
 

Dominik Przyborowski

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Some classic CMFB controlling tail current should be enough. Check in Ch 12 of Gray, Hurst, Meyer book
 

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