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常用的差动型双通道光电系统对两路光电信号的处理在电路上要求有很好的一致性,否则会影响其精度和灵敏度,据此设计了一种能满足这种光电系统要求的检测电路。它由双对数放大器ADL5310完成光电流到电压信号的变换,输出两路独立的与光电流呈对数关系的电压信号;再由仪表放大器AD620对这两路电压信号进行求差,最终完成检测。经实验测试表明,所设计的电路是正确、可行的。该检测电路可接收3nA～3mA的大动态范围的光电流输入,带宽为120dB,在缓变光信息检测方面具有一定的普适性。
Commonly used differential dual-channel optoelectronic systems on the two optoelectronic signal processing circuit requires a very good consistency, otherwise it will affect the accuracy and sensitivity, thus designing a test to meet the requirements of this optoelectronic system Circuit. It consists of double logarithmic amplifier ADL5310 to complete the photocurrent to the voltage signal conversion, the output of two independent and photocurrent logarithmic voltage signal; and then by the instrumentation amplifier AD620 voltage difference between the two signals, and ultimately completed the test . The experimental test shows that the circuit designed is correct and feasible. The detection circuit can receive 3nA ~ 3mA large dynamic range of photocurrent input, the bandwidth of 120dB, in the detection of slowly changing optical information has a certain degree of universality.