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CMFB and Operating Floating Amp

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ghostdog

ghostdog

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hi everybody,

when designing an amplifier like this one
Untitled1.jpg

and in Johan Huijsing, OPERATIONAL AMPLIFIERS, Theory and Design, Kluwer Academic Publishers, 2001, Ch 9 for this amplifier design says something like this
Untitled2.jpg

should i use a CMFB?

thk
 
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Fully differential opAmps always need a CMFB. Here, the CMFB stage is already integrated: M41 - M46 . The common mode feedback works from M46 into M36 , whereas M43 to M34 as well as M44 to M33 provide positive 1/N feedback to the output stage.
 
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