基于APD的远程激光测距系统光电匹配研究.pdfVIP

第 38 卷第 1 期 光电工程 Vol.38, No.1 2011 年 1 月 Opto-Electronic Engineering Jan, 2011 文章编号：1003-501X(2011)01-0001-05 基于 APD 的远程激光测距系统光电匹配研究 胡建人 ( 杭州电子科技大学 理学院，杭州 310037 ) 摘要：针对主动式红外弱光检测，本文研究如何提高和稳定雪崩光电二极管 APD 电路增益，及其光电匹配参数。 该方法根据 APD 增益或噪声与反向偏压分别呈指数或线性关系，采用温度补偿电路稳定 APD 偏压，通过调整串 联稳压管获得接近 APD 的温度系数，使器件工作点接近其击穿电压，获得超 100 倍的增益。采用交流耦合的本级 负反馈低电压低噪声NPN 晶体管电路，提高频响和晶体管截止频率f T 。在保持电路稳定性的前提下，电压增益可 提高到原来的 2∼3 倍，光电系统灵敏度提高 23 dB 以上。功率激光二极管 LD 的 PN 结温度变化导致波长漂移， 难与极窄带宽匹配。抑制背景辐射的干涉滤光片带宽介于 10∼15 nm 为宜。 关键词：雪崩光电二极管/APD ；低噪声放大电路；温度补偿电路；窄带宽干涉滤光；红外背景辐射 中图分类号：TN2；TN312.7 文献标志码：A doi：10.3969/j.issn.1003-501X.2011.01.001 Research of Opto-electronic Match in Long-distance Laser Ranging System Based on APD HU Jian-ren ( Science School, Hangzhou Dianzi University, Hangzhou 310037, China ) Abstract : Aimed at active weak IR detection, how to get the stable high gain from Avalanche Photodiode (APD) circuits and its opto-electronic matching characters are researched. The methods are relation with APD exponent gain and linear noise with its reverse bias voltage. It gets closed to temperature coefficient by serial Zener diodes and always-stable bias voltage to APD near break voltage at real PN junction temperature, and is over 100 times gain with temperature complement circuits. Transistor cut-off frequency and its response are increased by NPN type transistor with an improved a.c. couple low noise and low voltage supplier negative feedback circuits. The s