Bode Plot Question(Phase and Gain Margin)by JohnielWhite Tags: bode, gain, margin, plot, questionphase 

#1
May211, 02:54 PM

P: 47

I have been drawing a few bode diagram by hand and i am ask to find the phase and gain margin of the plot. Can someone please explain what are phase and gain margin, including how to determine it from the bode plot?




#2
May211, 05:40 PM

Mentor
P: 39,648

These are related to the stability of the system producing the Bode plot. Remember that you have an oscillation condition if your gain is >=1 and you have 180 degrees of phase shift in your negative feedback leg. Gain and Phase margin are two measures of how stable your system is. 



#3
May211, 08:52 PM

P: 47

I now have a better understanding of the significance of the bode plot to a control system. Thanks for your post.



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