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OPAMP-RC continuous-time filter

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chenmy

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Hello,everyone!When designing a fully differential OPAMP-RC continuous-time low-pass filter, the CMFB bandwidth should be made larger than the OPAMP's unit-gain-bandwidth or smaller than it? why?
 

I was thinking the same thing! I made my CMFB bandwidh smaller then by GBW of my amplifier but found I had problems if it was smaller then my GBW/2 of my amp. I couldn't find an answer to this problem but all my simulations showed it was fine. Also my chip, when received back from Fab worked 100% so I would say it is ok to below GBW but higher then GBW/2 of your amplifier.

Can any senior designer confirm this?
Jgk
 

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