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What is the voltage gain of a high frequency response of differential amplifier?

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What is the voltage gain of a high frequency response of differential amplifier?

(a) 1

(b) 0

(c) ∞

(d) Cannot be determined

The question was posed to me in an internship interview.

My question is based upon High Frequency Response of the Differential Amplifiers topic in section Frequency Response of Electronic Devices & Circuits

1 Answer

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Correct option is (a) 1

To explain: 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 High frequency response of differential amplifier. The output voltage expression would be the difference between the two voltages.

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