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Pros and cons of switched capacitor and static CMFB for differential amplifiers

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tyanata

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Can any one tell which are the positives and negatives of these types CMFB for diferential amplifgiers:
1. Switched capacitor CMFB.
2. Static CMFB.
 

Re: Common mode feedback

Hi,

In general, CMFB circuit are used in the negative feedback configuration. Im sure the static CMFB is the conventional method being used in controlling the signal symmetry but about the switch capacitor, Im not very sure on that. Let see what others respond.

Thanks,
Suria3
 

Re: Common mode feedback

In switched capacitor CMFB, with accurate timing, the circuit cancels offset during the idle time and opens when the signal is coming.However this approach fails for continous receiving systems. Its probably more to a positive type.

Rgds
 
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