The amplifier described in given Problem is to be stabilized by moving the first pole by using Miller compensation. Assuming that f_P2 and f_P3 remain fixed, determine the frequency to which f_P1 must be moved such that the phase margin is 60 degrees.

Problem
A feedback amplifier has a low-frequency open-loop gain of 4000 and three poles at f_P1 = 400 kHz, f_P2 = 4 MHz, and f_P3 = 40 MHz. A dominant pole is to be inserted such that the phase margin is 60 degrees. Assuming the original poles remain fixed, determine the dominant pole frequency.