基于APD的微弱光脉冲接收前端电路设计
Design of a Front-End Circuit for Weak Optical Pulse Reception Based on APD
于洪皓1
作者信息
- 1. 北京邮电大学信息与通信工程学院，北京 100876
- 折叠
摘要
本文针对微弱光脉冲接收中前端电路对高带宽、低噪声和稳定输出的要求，设计了一种基于雪崩光电二极管（APD）的接收前端放大电路。该电路包括APD的高压偏置电路、跨阻放大电路和后级电压放大电路。本文先分析了前端带宽和输出能力的设计要求，再讨论输入总电容、反馈网络和级联增益分配对带宽、噪声和稳定性的影响。在此基础上，本文完成了器件选择、电路参数设计、仿真和实现。实验结果表明，该前端电路的-3dB带宽约为620MHz。该电路在百兆赫兹量级调制输入下能够稳定输出。该电路的电噪声均方根值为16.602mV。结果说明，该前端电路能够在较高频率响应条件下保持较低本底噪声和稳定输出，可以为微弱光脉冲接收前端提供参考。
Abstract
This paper designs an avalanche photodiode (APD)-based receiver front-end amplifier circuit to meet the requirements of high bandwidth, low noise, and stable output in weak optical pulse reception. The circuit consists of a high-voltage bias circuit for the APD, a transimpedance amplifier circuit, and a post-stage voltage amplifier circuit. The design requirements for the bandwidth and output capability of the front end are first analyzed, and then the effects of total input capacitance, the feedback network, and cascaded gain distribution on bandwidth, noise, and stability are discussed. On this basis, device selection, circuit parameter design, simulation, and implementation are completed. Experimental results show that the -3dB bandwidth of the front-end circuit is approximately 620 MHz. The circuit can provide stable output under modulated inputs at the hundreds-of-megahertz level. The root-mean-square value of the electrical noise is 16.602 mV. The results indicate that the proposed front-end circuit can maintain low background noise and stable output under high-frequency response conditions, and can provide a reference for the front-end design of weak optical pulse reception.关键词
微弱光脉冲接收/雪崩光电二极管/信号处理电路/跨阻放大Key words
weak optical pulse reception/avalanche photodiode/signal conditioning circuit/transimpedance amplification引用本文复制引用
于洪皓.基于APD的微弱光脉冲接收前端电路设计[EB/OL].(2026-04-27)[2026-04-28].http://www.paper.edu.cn/releasepaper/content/202604-204.学科分类
光电子技术/电子电路
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