Electronics and Communication Engineering - Automatic Control Systems - Discussion

19. 

If phase angle of open loop transfer function becomes - 180° at frequency ω1, then gain margin is equal to

[A]. |G(jω1)|
[B].
[C]. 1 + |G(jω1)|
[D].

Answer: Option B

Explanation:

If gain is a, gain margin is . In this case gain is |G(jω1)|.


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