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Analog Electronic Circuits

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Operational Amplifier

Question
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What is the differential gain of a differential amplifier? What is common-mode gain of a differential amplifier?

When the two input signals are applied to the two terminals of a differential amplifier, the difference between the two input signals is amplified and the gain of amplifier is known as the differential gain of the differential amplifier.
When two terminals of a differential amplifier are connected to the same input signal, the gain of a differential amplifier is called common-mode gain.