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phase margin measurement from transient plot

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vndjn

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phase margin measurement

Hi,
Is there any function in icfb to meaure phase margin from transient plot.

Thanks,
 

u must do in ac to see phase margin.
 

vndjn said:
Hi,
Is there any function in icfb to meaure phase margin from transient plot.

Thanks,
Click to expand...


this cant be done, you can judge the phase marge from the transient plot of step response
 

for a 2-pole system, you can use this idea.
And I think Step response is more important than PM for reality use.
for example when system has one dominant pole and 2 conjugate poles, or has zeros, PM may be good, but step response is very bad.
 

Thanks,
from step response we know the overshoot and settling time, so i want to know can we get PM value by overshoot/settling.
 

Very easy get PM from: calculator =>ac >function PhaseMargin

Added after 5 minutes:
Alan_Nesta said:
for a 2-pole system, you can use this idea.
And I think Step response is more important than PM for reality use.
for example when system has one dominant pole and 2 conjugate poles, or has zeros, PM may be good, but step response is very bad.
Click to expand...

more precise, LARGE step response. Because transistor may leave saturation region
 

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