Discussion
With that loop gain, an open-loop distortion of \( 2 \) per cent becomes about
Answer: C
Internal distortion is divided by one plus the loop gain:
\[ \frac{2\%}{51} \approx 0.04\% \]
giving about 0.04 per cent, a fiftyfold improvement obtained from gain that was surplus to requirements. This calculation is why audio power amplifiers with unremarkable output stages can meet demanding distortion specifications, and why open-loop gain is designed to be as large as stability permits.
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