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Gain and Phase Margins Explained!

Brian Douglas

Why people recommend it

Brian Douglas explains gain and phase margin and what they say about closed-loop stability; recommended to students of feedback and amplifier stability.

In their words

It changes asymptotic gain (of course), 3dB cut-off frequency, bandwidth, the damping ratio/quality factor, thus the phase margin or stability and so on.

Unknown123 on electronics.stackexchange.com, Mar 2021. CC BY-SA.

As far as I understood from here, phase margin means the amount of phase that needs to be added in order to coincide with 0 db gain and -180 degrees phase.

aadil095 on electronics.stackexchange.com, Mar 2018. CC BY-SA.

This gentleman does an excellent job explaining phase/gain margin and gets into nyquist plots and how they play an imporant role in stability.

klamb on electronics.stackexchange.com, Aug 2016. CC BY-SA.

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