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## Q. 6.RQ.6

Define phase margin, $PM.$

## Verified Solution

The phase margin $PM$ is a measure of how far in phase the Nyquist plot is from instability. In the typical case, if the phase of the system at gain crossover is $\phi ,$ then the phase margin is $180^◦ + \phi.$ For example, if $\phi = −150^◦,$ then the phase margin is $30^◦.$