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What is the total voltage gain of a cascading transistor configuration 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 cascading transistor configuration 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

This question was posed to me in an online interview.

The query is from The Cascode Transistor Configuration in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Correct choice is (c) 60dB

Explanation: The total gain of a cascading transistor configuration 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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