Before revision: In electronic amplifiers, the phase margin (PM) is the difference between the phase lag (< 0) and -180°, for an amplifier's output signal (relative to its input) at zero dB gain or output is same as of - i.e.
After revision: In electronic amplifiers, the phase margin (PM) is the difference between the phase lag (< 0) and -180°, for an amplifier's output signal (relative to its input) at zero dB gain - i.e.