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hi
r1=r3,r2=r4. RL and CL is the load of your circuit. CMFB must work.
do OP analysis and the difference between VON and VOP ( VON - VOP)is the offset of total ckt. then , r1/(r1+r2)*(VON-VOP) will be the offset of the amp.
B.R.
Analysis of Switched-Capacitor Common-Mode
Feedback Circuit
Ojas Choksi, Member, IEEE, and L. Richard Carley, Fellow, IEEE
it says "CM loop should be comparable to that of the differential loop to avoid output signal distortion resulting from clipping due to slow settling of the output CM...
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