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What is the purpose of using a difference amplifier?

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What is the purpose of using a difference amplifier?

(a) Increase voltage gain

(b) Decrease voltage gain

(c) Increase current gain

(d) Decrease current gain

The question was asked in a national level competition.

Origin of the question is Transistor Difference Amplifiers topic in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

1 Answer

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Correct answer is (a) Increase voltage gain

The explanation: A circuit having a single transistor configuration does not provide suitable bandwidth or gain. The purpose of a difference amplifier is to provide an increase in the voltage gain. The total gain of a difference amplifier is the product of the voltage gains of the discrete stages.

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