The \(\mathrm{dB}\) magnitude-phase angle plot for a typical open loop transfer function is shown below. Gain margin and phase margin respectively are

(a) \(4 \mathrm{~dB}, 20^{\circ}\)
(b) \(-4 \mathrm{~dB},-20^{\circ}\)
(c) \(-4 \mathrm{~dB}, 20^{\circ}\)
(d) \(4 \mathrm{~dB},-20^{\circ}\)

Transcribed Image Text:

(0=3 @= 21 -200 -180 -160 Phase angle @=0.2 -16 dB magnitude 12 -8 0 -4 -8 -12 -14 @= 1.0