I want to observe a gain margin with variable gain. How to plot variable to gain margin, where gain of transfer function is varying in step size?

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chirag rohit 2022-2-25

评论： Sam Chak 2022-2-26

clc

clear all

m = -2:0.1:5;

c = 25;

x = 10;

% x = 0:0.01:20;

% y = m.*x+c;

s = tf('s')

H = tf([1 m],[1 x c])

bode(H);

[Gm,Pm,Wcg,Wcp] = margin(H)

plot(m,Gm)

Sam Chak 2022-2-26

Since

and

are constants, have you checked manually if the gain margins are finite or infinite in the desired operating range

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