babun123
Newbie level 5
I have an amplifier with autozero implemented. The overall amplifier is implemented as a switched capacitor amplifier. In the amplification phase, if I break the loop (put 'diffstbprobe' or 'cmdmprobe') and run tran-stb analysis, due to the introduction of 'gmin' from each node to ground by Spectre, there comes a zero at dc and a pole depending on the value of gmin and autozero cap. So, how do I get a proper estimate for the actual loop gain of the amplifier in this situation. Because of these zero-pole pairs (due to 'gmin' problem), the phase response and phase margin also deviates from the actual. So, how to get around this problem and get the proper loop gain and phase plot in Spectre?