- #1
varunag
- 25
- 0
Hi
I was plotting the bode plot for [tex] \frac{1}{s^2 + 1} [/tex].
I found the following bode plot,
http://home.iitk.ac.in/~varunag/prob2q1-uncomp.jpg"
Here we can see two gain crossover frequencies. Thus two phase margins.
On googling, I found this paragraph in a book:
Which of the phase margins should be considered? and why?
TIA,
varunag
I was plotting the bode plot for [tex] \frac{1}{s^2 + 1} [/tex].
I found the following bode plot,
http://home.iitk.ac.in/~varunag/prob2q1-uncomp.jpg"
Here we can see two gain crossover frequencies. Thus two phase margins.
On googling, I found this paragraph in a book:
If there is more than one gain crossover frequency, there is more than one phase margin. For a stable system, the smallest candidate phase margin should be chosen
Which of the phase margins should be considered? and why?
TIA,
varunag
Last edited by a moderator: