| 摘要 |
An auto gain control circuit comprises a first peak detector, a variable gain amplifier, a second peak detector, a multiplexer and a controller. The first peak detector detects peaks of an input signal to generate a first peak signal. The variable gain amplifier amplifies the input signal to generate an output signal according to a control signal. The second peak detector detects peaks of the output signal to generate a second peak signal. The multiplexer selectively outputs the first peak signal or the second peak signal according to a first control signal. The controller generates the control signal according to the second peak signal and the first peak signal or according to the second peak signal and the reference voltage.
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