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放大电路的幅频特性是衡量放大电路的重要指标,而带光电传感器放大电路的幅频特性一般无法直接测量,主要是因为没有标准的频率可变正弦波光源。提出了一种利用傅里叶变换光谱仪提供不同频率的标准正弦波光信号来测量带光电传感器放大电路幅频特性的方法,分析了探测器电容、运算放大器带宽和相位补偿对电流-电压放大电路带宽的限制,建立了电路模型,并对电路进行了仿真验证。采用高速A-D采集干涉信号,提出了一种便捷算法计算信号的幅度,实验结果证实了该方法的正确性和有效性,此方法也可用于其他带光电传感器放大电路。
The amplitude-frequency characteristic of the amplifying circuit is an important index to measure the amplifying circuit. However, the amplitude-frequency characteristic of the amplifying circuit with the photoelectric sensor generally can not be directly measured, mainly because there is no standard frequency variable sine wave light source. A method of measuring the amplitude-frequency characteristic of a photoelectric sensor amplifier circuit by using a standard sine wave optical signal with different frequencies by using a Fourier transform spectrometer is proposed. The effects of the detector capacitance, the operational amplifier bandwidth and the phase compensation on the bandwidth of the current-voltage amplifier circuit The circuit model is established and the circuit is verified by simulation. A high-speed A-D acquisition of interference signals, a convenient algorithm to calculate the amplitude of the signal, the experimental results confirm the correctness and effectiveness of this method can also be used for other optical amplifier with amplifier.