基于盖革APD阵列的单通道激光雷达信号读出电路设计

Single-channel LiDAR signal readout circuit design based on Geiger APD array

摘要:

随着测量技术的发展,激光雷达技术成为研究的热点,选取工作在盖革模式下的集成APD阵列雪崩二极管作为激光雷达的光电探测器,在探测距离为100-200m范围内,选择上升沿为5ns的激光脉冲,则接收带宽在70MHz~88MHz范围内,在此范围内APD探测器将接收到的回波信号转化为电信号,用TIA跨阻放大器反向放大模式将电流信号转化为电压信号,并将信号有效放大,输入至时刻鉴别电路,时刻鉴别电路用电压比较器来实现,最终可输出COMS逻辑电平信号；用TINA仿真软件进行仿真,仿真结果表明在接收带宽范围内TIA放大器的增益动态范围达到了54dB,总体电路延迟约为10ns。

Abstract:

With the development of measurement technology, lidar technology has become a research hotspot The integrated APD array avalanche diode working in Geiger mode is selected as the photodetector of lidar, and the laser pulse with rising edge of 5ns is selected in the range of detection distance of 100-200m, then the receiving bandwidth is in the range of 70MHz~88MHz, in which the APD detector converts the received echo signal into electrical signal, and the TIA transimpedance amplifier is used to reverse amplify The current signal is converted into a voltage signal by the TIA transimpedance amplifier, and the signal is effectively amplified and input to the moment identification circuit, which is implemented with a voltage comparator, and finally the COMS logic level signal can be output. The simulation results show that the gain dynamic range of the TIA amplifier reaches 54 dB within the receiving bandwidth, and the overall circuit delay is about 10 ns.