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1. Do you think it's possible to use switched CMFB (for continuous-time circuits? The most obvious continuous time circuit is filter. Would the following stages of filter out any common-mode bounce? How much common-mode bounce would get converted to differential? Would it just appear as a offset or gain error or distortion?
2. How do you use switched capacitor CMFB for a two-stage amplifier? You can just apply the CMFB to the second stage, but the first stage would need an additional CMFB. Would settling suffer? You can modify the swit-cap CMFB to be inverting, but then it's parasitics might affect the common-mode offset.
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