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Design >> Analog Design >> SC-CMFB: Which Phase CM voltage is important
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Message started by neoflash on Feb 18^th, 2009, 5:17am

Title: SC-CMFB: Which Phase CM voltage is important
Post by neoflash on Feb 18^th, 2009, 5:17am

I have a question that, in switched capacitor integrator design, the SC-CMFB should regulate CM voltage in which phase?

Integration phase or sampling phase?

Any suggestion on literature sample?

Title: Re: SC-CMFB: Which Phase CM voltage is important
Post by Berti on Feb 18^th, 2009, 11:24pm

I am not sure whether I understand your question correctly.
But I think that the CM voltage is regulated in both phases anyway.

Cheers

Title: Re: SC-CMFB: Which Phase CM voltage is important
Post by Sarig on Mar 10^th, 2009, 1:28pm

Hi,
It doen't improtent as long as your Amp keep the CM in place. and it should do so in both phases because your final results depands on both phases.
Erez

Title: Re: SC-CMFB: Which Phase CM voltage is important
Post by vamshikrishna on Apr 25^th, 2009, 4:47am

Hi Neoflash,

I think this is what your doubt is about..

The SC CMFB corrects the output CM voltage in sampling phase, in the integration phase the inputs are applied and the output commonmode gets slightly corrupted, which again is taken care of in the succeeding sampling phase.

Thanks
vamshi