Anachip
Member level 2
Hi,
I have some question here regarding phase margin calculation in feedback loop. Before this in my circuit design, i always see that my phase start either at 180 or 0 degree, so that at loop gain at unity i always get phase margin from 60 to 100 degree. But for this time, one of my circuit in feedback showing the phase start at -180 degree and at loop gain at unity the phase margin showing 304 degree. So, in this case what is the phase margin actually? can the phase start at -180 degree? Please explain.
Thanks,
Anachip.
I have some question here regarding phase margin calculation in feedback loop. Before this in my circuit design, i always see that my phase start either at 180 or 0 degree, so that at loop gain at unity i always get phase margin from 60 to 100 degree. But for this time, one of my circuit in feedback showing the phase start at -180 degree and at loop gain at unity the phase margin showing 304 degree. So, in this case what is the phase margin actually? can the phase start at -180 degree? Please explain.
Thanks,
Anachip.