一种增益自适应光电信号放大器

A Gain-adaptive Photoelectric Signal Amplifier

该文设计了一种针对光电信号的可自动调控增益的微弱电流信号放大器,该放大器使用电压比较电路与数字逻辑电路结合。电压比较电路对将输入的电压信号与设定的三个基准电压进行比较,再使用数字逻辑电路对比较结果进行处理得到增益选择信号,实现了电路根据输入信号的幅值自动选择放大增益。实验表明,该放大器可以将不同幅值的电流信号按照电路选择的增益放大到适合AD采集的幅值范围。

In this paper,a weak current signal amplifier with automatic gain adjustment is designed for photoelectric signals.The amplifier uses voltage comparison circuitry combined with digital logic.The voltage comparison circuit compares the input voltage signal with the set three reference voltages,and then uses the digital logic circuit to process the comparison results to obtain a gain selection signal,which realizes the circuit to automatically select the amplification gain according to the amplitude of the input signal.Experiments show that the amplifier can amplify current signals of different amplitudes to a range of amplitudes suitable for AD acquisition according to the gain selected by the circuit.