Hello guys,
I have a dual stage fully differential amplifier (first stage telescopic, second stage common source) with common mode feedback (CMFB) and it has been biased properly so that all transistors are operating in the "saturation" region.
Below is the response of my Differential Mode gain and phase:
At some point the phase on CM goes beyond 180 as it can be seen from the picture. I am wondering whether you can suggest a couple of things I could do to improve my phase margin? Right now is negative based on the graph.
Thanks