Measurements made on the internally compensated amplifiers

Question

Measurements made on the internally compensated amplifiers listed below provide the dc gain and the frequency at which the gain has dropped by 20 dB. For each, what are the 3 dB and unity-gain frequencies?

(a) 2 × 10_­z V/V and 5 × 102 Hz

(b) 20 × 105 V/V and 10 Hz

(c) 1800 V/V and 0.1 MHz

(d) 100 V/V and 0.1 GHz

(e) 25 V/mV and 250 kHz