Hi all,
I am trying to perform a stability analysis on a fully-differential op-amp; as suggested here and there, I am using the STB analysis with the "cmdmprobe" (analogLib) as probe element inside the differential loop.
The circuit is shown below and is very simple: the op-amp cell includes a continous-time CMFB.
The Bode diagram obtained by means of Result->Direct Plot->Main Form is shown below:
I tried different arrangement and options but the result is the same: as far as I can see the Bode plot is absolutely without sense.
Actually I used STB with cmcdprobe with many different circuits but such analysis seldom returns reliable results.
Do you have suggestion? Do I make a mistake in the setup?
Many thanks in advance, bye!
Cri