Signal processing circuit capable of selectively adjusting gain factor of sample-and-hold circuit and signal processing method thereof

摘要

A signal processing circuit including an amplifying circuit, a control circuit, and a sample-and-hold circuit is provided. The amplifying circuit receives an analog input signal and outputs a first analog signal by amplifying the analog input signal. The control circuit outputs a control signal according to the analog input signal. The sample-and-hold circuit is coupled to the amplifying circuit and the control circuit to selectively adjust a gain factor of the sample-and-hold circuit according to the control signal, thereby outputting a second analog signal according to the first analog signal and the gain factor.

主权项

1. A signal processing circuit, comprising:
an amplifying circuit, for receiving an analog input signal and outputting a first analog signal by amplifying the analog input signal; a control circuit, for outputting a control signal according to the analog input signal; a sample-and-hold circuit, coupled to the amplifying circuit and the control circuit, for selectively adjusting a gain factor of the sample-and-hold circuit according to the control signal to thereby output a second analog signal according to the first analog signal and the gain factor, and outputting a third analog signal according to the first analog signal and a reference gain factor, wherein the sample-and-hold circuit outputs the second analog signal by sampling the first analog signal with the gain factor, and outputs the third analog signal by sampling the first analog signal with the reference gain factor regardless of a strength of the first analog signal; and a processing circuit, coupled to the sample-and-hold circuit, the processing circuit arranged for receiving the second analog signal and the third analog signal to generate an output signal.