基于光电二极管反偏的光电检测电路的噪声分析

噪声性能是限制光电检测电路探测能力的重要因素,针对这个问题,设计了基于光电二极管反偏的光电检测电路并分析其电路噪声,分析噪声时,创新性地从光电检测电路结构出发,将整个电路等效为光电二极管、晶体三极管、运算放大器三个级联模块,详尽分析了每个模块的噪声来源及其相关因素,计算每个模块的输出噪声,最终得出整个电路的输出噪声电压模型。根据输出噪声电压模型,确定了电路的各项参数,预估电路的输出噪声电压,最后,搭建实际电路,测量电路的噪声性能,验证了输出噪声电压模型的准确性,实现低噪声光电检测电路的设计。

Noise analysis of photoelectric detection circuit based on photodiode reverse bias

The noise figure is an very important factor which can limit the detection capability of the photoelectric detection circuit. To solve the problem, a photoelectric detection circuit was designed in the condition of the photodiode reverse bias, and then the circuit noise was analyzed indetail. When analyzing the noise, the structure of the photoelectric detection circuit was focused on. The whole circuit could be equivalent to three cascade module which were the photodiode module, the triode module and the operational amplifier module. Then, the noise source and the associated factors of each module were analyzed, and the output noise voltage of each module was calculated. Finally, the output noise voltage model of the whole circuit could be obtained. At last, the parameters of the whole circuit were determined according to the module, the circuit was built, the noise of circuit was measured, the accuracy of the output voltage model was verified. It realizes the design of photoelectric detection circuit.