针对工作在盖革模式下的硅基雪崩光电二极管(APD)进行了接收电路的设计, 通过主动淬灭加快恢复的方式, 对APD偏压进行调控, 利用单稳态触发器使淬灭信号和恢复信号独立控制APD阳极的电压, 从而同时控制淬灭时间和恢复时间, 将死时间缩短至100.5ns, 计数频率提升到10MHz, 有效减少了后脉冲效应。采用脉冲甄别技术和单片机, 对脉冲信号进行计数, 通过对可见盲光子计数和暗计数的甄别, 实现对微弱紫外信号的检测, 为盖革模式下APD紫外通信奠定了基础。

Designed is the receiving circuit for the Si-based avalanche photodiode (APD)?倓working in Geiger mode, for which, the bias voltage of APD can be controlled with the method of active quenching and accelerated recovery. By using the monostable trigger, the quenching and recovery signals can be independently controlled by the voltage of the APD anode. Thus the quenching and recovery time can be controlled simultaneously, the dead time is shortened to 100.5ns, the counting frequency is improved to 10MHz and the afterpulsing effect is reduced. The pulse discrimination technology and single-chip microcomputer were used for counting pulse signals, then the weak ultraviolet signals were detected by discriminating the photon counts or the dark counts, realizing detection for weak UV signals.?倓