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What is the voltage gain of a differential amplifier is all amplifier values are equal?

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What is the voltage gain of a differential amplifier is all amplifier values are equal?

(a) 1

(b) 0

(c) ∞

(d) Cannot be determined

I had been asked this question during an interview.

My question comes from 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) 1

Best explanation: If all the resistor values are of the equal value, then the circuit will have a voltage gain equal to exactly one or unity. Hence it is also called as a Unity Gain Differential Amplifier. The output voltage expression would be the difference between the two voltages.

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