Question

What is the total voltage gain of a high frequency response of differential amplifier if input of first stage is 50V and the output of the second stage is 100V?

(a) 20

(b) 0.2

(c) 2.5

(d) 2

This question was posed to me in a national level competition.

Query is from High Frequency Response of the Differential Amplifiers in division Frequency Response of Electronic Devices & Circuits

Answer 1

Right choice is (d) 2

To explain I would say: The total gain of a high frequency response of differential amplifier is the ratio of the output of second stage amplifier to the input of first stage amplifier. Where, Voutput = 100V and Vinput = 50V.

AV = Voutput / Vinput = 100V / 50V = 2.