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SC-CMFB: Which Phase CM voltage is important (Read 3505 times)

neoflash Community Fellow Offline Mixed-Signal Designer Posts: 397	SC-CMFB: Which Phase CM voltage is important 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?
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Berti Community Fellow Offline Posts: 356	Re: SC-CMFB: Which Phase CM voltage is important Reply #1 - 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
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Sarig Junior Member Offline Posts: 31	Re: SC-CMFB: Which Phase CM voltage is important Reply #2 - 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
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yvkrishna Senior Member Offline Posts: 117	Re: SC-CMFB: Which Phase CM voltage is important Reply #3 - 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
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