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How is the voltage gain measured in a high frequency response of multistage amplifier?

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How is the voltage gain measured in a high frequency response of multistage amplifier?

(a) Volts

(b) Ampere

(c) Decibels

(d) Dimensionless

The question was posed to me by my college director while I was bunking the class.

Origin of the question is High Frequency Response of Multistage Amplifiers topic in portion Frequency Response of Electronic Devices & Circuits

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Right choice 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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