Discussion
Assertion (A): Assertion: Negative feedback improves an amplifier's signal-to-noise ratio.
Reason (R): Reason: Feedback divides internal errors by one plus the loop gain.
Select the correct answer from the options below.
Answer: A
The reason is true but the assertion is false in general: noise entering at the input is amplified with the signal and the ratio is unchanged, and only noise generated inside the loop is reduced. Since the input stage's own noise usually dominates, feedback typically does nothing for the noise figure. Where an imperfection enters decides whether the loop can act on it, and the input is precisely where it cannot.
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