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How is the voltage gain measured in a difference amplifier?

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How is the voltage gain measured in a difference amplifier?

(a) Volts

(b) Ampere

(c) Decibels

(d) Dimensionless

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Question is from Transistor Difference Amplifiers in section Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Correct answer is (c) Decibels

The explanation is: 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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