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微弱光信号探测APD处理电路设计

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雪崩光电二极管（APD）具备微弱光信号探测性能，其相关处理电路的设计直接关乎APD探测能力的大小。分析了APD光电探测器工作原理、自身特性及外界影响因素，研究了APD工作电路的组成与最佳工作电路的设计问题。后期信号处理阶段，设计了APD信号放大处理电路，满足了低噪声、带宽匹配，微弱信号放大的要求。在APD微弱光信号探测领域具有一定的意义。

Avalanche photodiode （APD） has the characteristic of detecting weak light signals. The detection characteristic of APD is directly depended on the design of relevant processing circuits. The operation principle and characteristics of APD electro-optic detectors and external influence factors are analyzed. The composition of opera-tion circuit and the best design of APD are researched. During signal post processing, the signal amplification pro-cessing circuit of APD is designed. And the requirements of low noise, bandwidth matching and weak signal amplifi-cation are met, which has an important significance in the field of weak light signal detection of APD.