Question

How to calculate gain margin and phase margin in bode plot?

Answer 1

Explanation:

margin( sys ) plots the Bode response of sys on the screen and indicates the gain and phase margins on the plot. ... In other words, the gain margin is 1/g if g is the gain at the –180° phase frequency. Similarly, the phase margin is the difference between the phase of the response and –180° when the loop gain is 1.0.