Duncandu, I think your post is full of flaws:
Quote:No relationship for continuous-time filter, ....
Often the CMFB has some parts in common with the main Opamp. Hence, there is typically a relationship between CM and DM bandwidth.
Quote:For switched filter, the settling of CMFB is also a concern, but settling time for CMFB is not directly related to its bandwidth.
What determines the settling time if not the bandwidth ????
Cheers