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How is the voltage gain measured in a differential amplifier with active load?

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How is the voltage gain measured in a differential amplifier with active load?

(a) Volts

(b) Ampere

(c) Decibels

(d) Dimensionless

This question was addressed to me at a job interview.

My enquiry is from Differential Amplifier with Active Load in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Correct answer is (c) Decibels

To elaborate: The voltage gain is measured in terms of decibels. The total voltage gain is calculated as the product of individual stages or as a sum of all the stages if the gain calculated at each intermediate stage was measured in decibels as well.

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