Question: The gain-phase plot of a linear control system is shown below. What are gain margin (GM) and phase margin ( (mathrm{PM}) ) of the system?

The gain-phase plot of a linear control system is shown below.

gain (dB) +20 0 - 20 - 270 3 8 - 90

What are gain margin (GM) and phase margin ( \(\mathrm{PM}\) ) of the system?
(a) \(\mathrm{GM}>0 \mathrm{~dB}\) and \(\mathrm{PM}>0\) degree
(b) \(\mathrm{GM}(c) \(\mathrm{GM}>0 \mathrm{~dB}\) and \(\mathrm{PM}(d) \(\mathrm{GM}0\) degree

gain (dB) +20 0 - 20 - 270 3 8 - 90 - 180 Phase (degrees)

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