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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 determinedI 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

Answer»

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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