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Which of the following is a combination of inverting and non-inverting amplifier?

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Which of the following is a combination of inverting and non-inverting amplifier?

(a) Differential amplifier with one op-amp

(b) Differential amplifier with two op-amps

(c) Differential amplifier with three op-amps

(d) Differential amplifier with four op-amps

This question was posed to me by my college professor while I was bunking the class.

My question comes from Differential Amplifiers with Multiple Op-Amp topic in division Operational Amplifier Characteristics of Linear Integrated Circuits

1 Answer

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A combination of inverting and non-inverting amplifier is the differential amplifier. The correct answer is (b) Differential amplifier with two op-amps. The differential amplifier configuration uses two op-amps: one configured as an inverting amplifier and another as a non-inverting amplifier. The two stages work together to amplify the difference between two input signals while rejecting common-mode signals. This configuration provides high input impedance and excellent common-mode rejection ratio (CMRR).

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