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Electronic Devices & Circuits Feedback Amplifiers

The sensitivity of closed-loop gain to variations in open-loop gain is reduced by approximately which factor in a negative-feedback amplifier?

A1+A beta
BA-beta
C1-A beta
DA/beta only

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Correct Answer: A. 1+A beta

Explanation: Negative feedback desensitizes the gain; fractional gain variation is reduced approximately by the desensitivity factor 1+Aβ.

Reference: Standard analog electronics: feedback desensitivity

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