单光子雪崩二极管行为性仿真建模

Behavioral Simulation Modeling of Single Photon Avalanche Diode

提出了一种精确的单光子雪崩二极管(SPAD)行为性仿真模型。解决了SPAD模型仿真雪崩电流时难收敛的问题,建立了SPAD器件直流和交流特性基本功能的仿真模型。进行了模型功能的拓展,根据后脉冲与暗计数的产生机理,实现了对这两种最重要的统计效应的模拟。模型使用模拟硬件描述语言Verilog-A实现,具有很强的移植性和通用性。模型的基本功能仿真结果与实测结果达到90%以上的一致性,验证了该模型具有较高的仿真精度和很好的仿真收敛性,而暗计数和后脉冲的仿真功能增加进一步提高了模型的实用性。

An accurate behavioral simulation model for single photon avalanche photodiode(SPAD) was proposed.This presented model solved the convergence problem existed in SPAD avalanche current simulation,and achieved the basic static DC and dynamic AC behaviors modeling.The model functions were extended.Two important statistical effects of dark-counting and after-pulsing phenomena were included in this model according to their physical mechanisms.The model has been written in Verilog-A hardware description language,showing good characteristics of transplantation and universality.A good agreement with more than 90%accuracy is achieved between the model basic simulations and the experimental results,proving the high accuracy of model and good convergence during simulation.Meanwhile,the added simulation functions of dark-counting and after-pulsing further improves the model practicability.