wafi_zuhdi
Newbie level 6
Hi, i'm a little bit confused about phase margin in close loop
so let say i design an amplifier in an open loop has a phase margin of 70.
in close-loop, i break the loop and insert the feedback value that i want to inspect at the input, making the the circuit looking like a open loop again.
So the phase margin will go from 180 degree (because of negative feedback) to 0 degree. So the phase margin of a closed loop = 0 - (phase at gain = 0)?
is this correct?
thanks
so let say i design an amplifier in an open loop has a phase margin of 70.
in close-loop, i break the loop and insert the feedback value that i want to inspect at the input, making the the circuit looking like a open loop again.
So the phase margin will go from 180 degree (because of negative feedback) to 0 degree. So the phase margin of a closed loop = 0 - (phase at gain = 0)?
is this correct?
thanks