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Gain and phase margin (Read 2754 times)
raja.cedt
Senior Fellow
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Posts: 1516
Germany
Re: Gain and phase margin
Reply #15 -
Jan 23
rd
, 2012, 5:46am
hello,
you don't even have 57 Phase Margin, In-fact here Phase margin won't give good picture due to lack of monotonicity
ALWAYS USE MONOTONIC BODE PLOT.
OTHERWISE GO FOR NYQUiST.
Thanks,
raj.
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buddypoor
Community Fellow
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Posts: 529
Bremen, Germany
Re: Gain and phase margin
Reply #16 -
Jan 23
rd
, 2012, 6:34am
sapna wrote
on Jan 23
rd
, 2012, 4:48am:
this is the gain and phase plot i am looking at
According to your gain/phase plot the phase margin is only approx. 20 deg. and the gain margin is approx. 25 dB
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LvW (buddypoor: In memory of the great late Buddy Rich)
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SoliS
Junior Member
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Posts: 14
Re: Gain and phase margin
Reply #17 -
Feb 2
nd
, 2012, 7:19am
Your gain drops to 0 dB at about 5x10^6 Hz. If we look at the same frequency on the phase plot, we see that the phase is about 20 degrees there. Thus, your phase margin is 20 degrees.
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