Question

What is the total voltage gain of a cascading transistor configuration if the gain of first stage is 48 and the gain of the second stage is 12?

(a) 6.75

(b) 6.55

(c) 5.76

(d) 5.65

I have been asked this question during an internship interview.

My question comes from The Cascode Transistor Configuration in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer 1

Correct option is (c) 5.76

Explanation: The total gain of a cascading transistor configuration 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.