Quote:What do you mean when you say that high common-mode bandwidth comes at the price of reduced differential-mode bandwidth with an SC-CMFB? Could you elaborate please?
Vivek,
The bandwidth of a SC-CMFB depends on the size of the two capacitors connected between the outputs and the controlling node. Larger capacitors will give larger common-mode bandwidth but increases the loading of the amplifier, therefore decreasing the differential-mode bandwidth.
The following paper is worth reading:
Ojas Choksi and L. Richard Carley , Analysis of Switched-Capacitor Common-Mode Feedback Circuit ; IEEE Transactions on Circuits and Systems II ; 2003 .
Regards