APD传感器在多重噪声因素作用下最优倍增因子的确定方式  

Determination Method of Optimum Gain for APD Sensor Under the Action of Multiple Noises

作　　者：苏震[1] 梁小龙[1] 毕善鹏[1] 

机构地区：[1]中国传媒大学信息工程学院,北京100024

出　　处：《中国传媒大学学报（自然科学版）》2012年第4期36-40,26,共6页Journal of Communication University of China：Science and Technology

摘　　要：首先介绍了APD传感器的传感原理,接着对APD传感器工作时产生的几种噪声情况进行了详细的分析。基于对APD传感器的信噪比和等效噪声功率的分析和计算,给出了APD传感器在多重噪声因素作用下的最优倍增因子确定方式及其相对应的噪声等效功率的求算方法。讨论分析了APD传感器的雪崩增益与光电变换信噪比的关联特征,归纳了在入射光功率和噪声因素变化时,最优倍增因子的变化规律。参照结论,可以方便地确定APD倍增因子的最佳数值,并得到相应的噪声等效功率水平。这对于确定和控制APD传感器的光电信息变换特性,以及进行后续低噪声接口电路设计,具有理论引导意义和实际应用价值。The article first introduced the sensing principle of APD sensor.Then several kinds of noises which produced by APD sensor while working are analyzed in detail.Determination method of optimum avalanche multiplication rate（gain） and its computing method of noise equivalent power（NEP） under the action of multiple noise are proposed basing on the analysis and computing of APD sensor＇s signal-to-noise ratio（SNR） and NEP.At the same time,the associated feature of APD sensor avalanche gain and photoelectric conversion SNR was discussed and analyzed.The variation of optimum gain is summarized at the change of the incident optical power and noise factors.According to conclusion,we can easily get the optimum gain of APD sensor and the NEP.It has great theoretical significance and use value for determining and controlling APD sensor＇s characteristic of photoelectric transforming and so as to the design of low-noise interface circuit.

关 键 词：APD传感器 微光检测 信噪比 散粒噪声 雪崩超量噪声 倍增因子 噪声等效功率 

分 类 号：TN364[电子电信—物理电子学]