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 CF = 20 pF, determine the new dominant pole frequency
and phase margin if the compensation capacitor is increased to CF = 75 pF.