Question

What is the total voltage gain of a difference amplifier 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

This question was posed to me by my school teacher while I was bunking the class.

This is a very interesting question from Transistor Difference Amplifiers in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer 1

Right answer is (c) 5.76

Easy explanation: The total gain of a difference amplifier 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