Gain control circuit and gain control method
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United States of America Patent
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May 8, 2018
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app pub date -
Nov 30, 2016
filing date -
Dec 3, 2015
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Abstract
A gain control circuit, having an attenuator including first to n-th (n>2) attenuator parts that attenuate an input signal respectively in accordance with first to n-th attenuation control signals to thereby generate an attenuated input signal, a signal amplifier configured to amplify the attenuated input signal, a detector circuit configured to conduct an envelope detection on the amplified attenuated input signal to thereby obtain an amplitude value, a comparator circuit configured to compare the amplitude value with a reference threshold value to thereby generate a comparison result signal, and an attenuator control circuit configured to generate the first to n-th attenuation control signals using the comparison result signal. The attenuation control signals indicate first to n-th attenuation amounts by which the first to n-th attenuator parts respectively attenuate the input signal, and first to n-th time periods during which the first to n-th attenuator parts respectively operate.
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