Hi, I want to test the GBW of CMFB in this OTA, but don't know where to separate the circuit and give the input or test the output. Can anybody tell me please? Thanks a lot[/img]
NO, can't be that way, at least we should not break the feedback network composed of M5/Ra/M7/M4, besides vr2 is a reference voltage, maybe we should not replace it with input signal.
why not give the 1vac input at node 3 at the side of M7, after breaking at node 3?
It seems in this way, it can be a loop. Besides what if break at node 5 and give the input signal at gate of M7, measure GBW at drain of M3? Will that be equivalent to the way you mentioned above?