xianweng wrote on Sep 1st, 2013, 9:16am:Hi ,everybody
If PM of an amp below 0,it will oscillate nearby Vref or from 0 to VDD or something else?
best regards
When the PM is negative, there will be a lower frequency fo that exhibits a PM=0 deg.
This is the frequency where oscillations
might occur. However, it depends on the loop gain magnitude at this frequency if you can observe oscillations or some other kind of instability.