Determine the new dominant pole frequencynbspnbspand phase

Question

A feedback amplifier with a compensation capacitor has a low-frequency loop gain of T (0) = 100 dB and poles at   = 10 Hz,  = 5 MHz, and  = 10 MHz.

(a) Find the frequency at which |T ( f )| = 1, and determine the phase margin.

(b) If the frequency   is due to a compensation capacitor C_F = 20 pF, determine the new dominant pole frequency  and phase margin if the compensation capacitor is increased to C_F = 75 pF.