elmolla said:There is something interesting that I noted, I used to look only at the phase margin result, but when I looked at the loop phase and gain I found weird cut like effect in the phase response of the loop, it is like having two LHP zeros, then the phase drops steeply then gets back on the rise, so I have a shape like the letter N in the phase , but this occurs at a gain or around -25dB!! Am I missing something?
elmolla said:Do you mean that even if the normal phase margin calculation gives a stable circuit, any phase discontinuity, like the N I've seen, means that the circuit is unstable?
elmolla said:.....followed by a PMOS switch
LvW said:elmolla said:.....followed by a PMOS switch
A switch ??? No linear control element ?
quaternion said:It seems to be like my problem.
elmolla said:I also have one loop which is stable as I said before.
LvW said:elmolla said:I also have one loop which is stable as I said before.
Now I am confused ! In an LDO circuit there is only one loop. And now you state it is stable ? What then is the problem ?
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