Question

What is the total voltage gain of a differential amplifier with active load if the gain of first stage is 4.8 and the gain of the second stage is 1.2?

(a) 6.75

(b) 6.55

(c) 5.76

(d) 5.65

I have been asked this question in final exam.

My question is taken from Differential Amplifier with Active Load topic in chapter Differential and Multistage Amplifiers of Electronic Devices & Circuits

Answer 1

Correct answer is (c) 5.76

To elaborate: The total gain of a differential amplifier with active load can be calculated by the formula given below. Where, AV = overall gain, AV1 = voltage gain of first stage and AV2 = voltage gain of second stage.

AV = AV1 × AV2 = 4.8 × 1.2 = 5.76