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What is the voltage gain of a differential amplifier with active load?

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What is the voltage gain of a differential amplifier with active load?

(a) 1

(b) 0

(c) ∞

(d) Cannot be determined

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Question is taken from Differential Amplifier with Active Load topic in chapter Differential and Multistage Amplifiers of Electronic Devices & Circuits

1 Answer

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Right answer is (a) 1

For 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 with active load. The output voltage expression would be the difference between the two voltages.

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