一种低检测阈值的高速主被动混合淬火电路设计

A high-speed mixed active-passive quenching circuit design with low detection threshold

基于标准CMOS工艺,设计了一种用于单光子探测器的高速、低功耗主被动混合淬火电路。采用电流镜结构,设计一种低阈值快速比较器,将雪崩电流与阈值电流进行比较,以实现雪崩电流检测;比较器输出信号控制雪崩光电二极管的阳极电压,从而实现淬灭与恢复。采用Cadence软件,根据SPAD的SPICE模型,完成电路设计与仿真。结果表明,该淬火电路的淬灭时间为0.5 ns,恢复时间为1.34 ns,整体的死区时间为13.4 ns,检测阈值为1.3μA,功耗小于0.046 mW。

A high-speed,low-power mixed active-passive quenching circuit for single-photon detectors based on a standard CMOS process was designed. Used the current mirror structure,a low-threshold fast comparator was designed. The avalanche current was detected by comparing the avalanche current with the threshold current. The output signal of comparator controlled the anode voltage of the avalanche photodiode to achieve quenching and reset. On the basis of the SPICE model of SPAD,the circuit was designed and simulated by Cadence simulation software. The results of the quenching circuit indicated that the quenching time was 0.5 ns,the reset time was 1.34 ns,the dead time was 13.4 ns,the detection threshold was 1.3 μA,and the power consumption was less than 0.046 mW.