基于等效电路模型的APD特性分析

Analysis of APD Characteristics Based on Equivalent Circuit Model

为探究雪崩光电探测器(APD)的特性,采用APD等效电路模型模拟雪崩光电探测器的特性;通过对APD载流子速率方程、暗电流、噪声电流以及各寄生参量等方面的研究,得到了APD的等效电路模型,基于该电路模型在PSpice软件中分析了APD的光电流和暗电流与反向偏压的关系、脉冲响应特性、频率响应特性、噪声电流特性、不同入射光功率下的光电特性以及光电流与接受光强度的关系。

In order to explore the characteristics of the avalanche photodetector （APD）, the paper uses the equivalent circuit model of APD to simulate the characteristics of avalanche photodiode detector. Through the study of carrier rate equation, dark current, noise current and parasitic parameters etc. The paper obtained the equivalent circuit model of the APD, and carried on some analyzes using this model and the PSpice software to the relationship of light and dark current with reverse voltage, the impulse response characteristics and the frequency response characteristics, the noise current characteristics, the Electro-op- tical characteristics with different incident light power, and the relationship between photocurrent and the intensity of the received light.