| 摘要 |
A signal gain control circuit. A gain stage receives and amplifies an analog signal by a first gain factor adjusted by a gain adjusting signal in a periodic manner with a first period, and outputs an amplified signal. An analog to digital converter converts the amplified signal to a first digital signal comprising a stream of samples. An amplifying device adjusts a second gain factor in a periodic manner with a second period in accordance with a characteristic metric of the distribution of the first digital signal and multiplying the first digital signal by the second gain factor to generate a second digital signal. A first gain adjusting device detects a strength of the second digital signal and generates the gain adjusting signal according to the signal strength of the second digital signal in a periodic manner with the first period.
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