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为了精确模拟雪崩光电探测器(APD)的特性,提出了一种APD等效电路模型。文中首先从APD载流子速率方程出发,同时考虑芯片寄生参量和封装寄生参量的影响,得到了APD的等效电路模型,进而基于该电路模型在PSpice软件中分析了APD的光脉冲响应特性、频率响应特性、噪声特性和增益带宽特性。
In order to accurately simulate the characteristics of an avalanche photodetector (APD), an APD equivalent circuit model is proposed. In this paper, based on APD carrier rate equation, the equivalent circuit model of APD is obtained considering the effect of chip parasitics and package parasitics. Based on this circuit model, the APD optical pulse response characteristics are analyzed in PSpice software. Frequency response, noise characteristics and gain bandwidth characteristics.