Discussion
An amplifier's open-loop distortion is \( 5 \) per cent. With a loop gain of \( 49 \) the closed-loop figure is about
Answer: C
Internal distortion is divided by one plus the loop gain:
\[ \frac{5\%}{50} = 0.1\% \]
giving about 0.1 per cent. A loop gain of forty-nine has turned an unusable amplifier into a respectable one, using nothing but gain that was surplus to requirements. That is the trade in its most persuasive form, and it is why open-loop gain is designed to be as large as stability allows.
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