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What is the total voltage gain of a difference amplifier if the gain of first stage is 10dB, gain of the second stage is 20dB and gain of third stage is 30dB?

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What is the total voltage gain of a difference amplifier if the gain of first stage is 10dB, gain of the second stage is 20dB and gain of third stage is 30dB?

(a) 60.32dB

(b) 50dB

(c) 60dB

(d) 50.32dB

I have been asked this question in an internship interview.

I want to ask this question from Transistor Difference Amplifiers in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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The correct option is (c) 60dB

Explanation: The total gain of a difference amplifier is the sum of the multiple stages when the gain is calculated is decibels. Given, AV1 = 10dB, AV2 = 20dB and AV3 = 30dB

AV = AV1 + AV2 + AV3 = 10dB + 20dB + 30dB = 60dB

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