Discussion
An amplifier has \( 60 \ \mathrm{dB} \) of loop gain at \( 1 \ \mathrm{kHz} \) and a dominant pole at \( 10 \ \mathrm{Hz} \). Its loop gain at \( 10 \ \mathrm{kHz} \) is about
Answer: A
Above the dominant pole the gain falls twenty decibels per decade:
\[ 60 - 20 = 40 \ \mathrm{dB} \]
giving about 40 dB, so the distortion correction has fallen by a factor of ten over one decade of frequency. That is why distortion measurements are quoted at several frequencies rather than one, and why a figure at a kilohertz says little about behaviour at twenty.
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