An opamp has its first pole at 3 kHz and has high-frequency poles at 130 MHz, 160 MHz, and 180 MHz. Find the frequency where the phase shift is and, therefore, find the equivalent time constant that...

An opamp has its first pole at 3 kHz and has high-frequency poles at 130 MHz, 160 MHz, and 180 MHz. Find the frequency where the phase shift is and, therefore, find the equivalent time constant that models the highfrequency poles. How does this compare to the estimate given by equation (5.50)?