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What is the total voltage gain of a high frequency response of differential 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 high frequency response of differential 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

The question was posed to me in quiz.

My question is based upon High Frequency Response of the Differential Amplifiers in portion Frequency Response of Electronic Devices & Circuits

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Correct option is (c) 60dB

The explanation: The total gain of a high frequency response of differential 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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