subgold
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i doubt if it is a good idea.
provided ur targeted common mode voltage is fixed and not changed at every cycle, then the problem you mentioned is more like a startup issue. once it settles to the desired common mode level, the SC CMFB will hold it and will not change any more, because theoritically there will be no more charge/discharge happening in the lossy integrator formed by the SC CMFB.
from a practical point of view, how do you obtain the 4x clock? it could be very costly. if you already have such a clock available, then why not use it to enhance the performance of the SC integrator itself?
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