用于激光雷达的大动态范围时间-幅度转换器  

Wide-Range Time-to-Amplitude Converter for Lidar

作　　者：彭永梁 刘帅 谭荣清 PENG Yong-liang;LIU Shuai;TAN Rong-qing(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100194,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100194 [2]中国科学院大学,北京100049

出　　处：《光学与光电技术》2024年第4期21-27,共7页Optics & Optoelectronic Technology

摘　　要：为了适配激光雷达测距系统,设计了一种量程和精度可调的大动态范围时间-幅度转换器(Time-to-Amplitude Converter,TAC)。该TAC ASIC采用计数器与模拟电压斜坡进行配合,显著拓展了量程。采用180 nm CMOS工艺对电路进行了设计,单个TAC通道面积为400μm×260μm。整体电路的转换周期和采样周期通过外部信号控制,量程和分辨率可以调节以适应复杂场景下的应用。仿真结果表明在20 MHz工作时钟下TAC的量程为6.4μs,测量分辨率为50 ps,微分非线性优于±0.05 LSB,积分非线性优于±0.8 LSB。该TAC具有良好的性能,适用于大动态范围的激光雷达测距系统。In order to suit the lidar ranging system,a wide-range time-to-amplitude converter(TAC)with adjustable range and resolution is designed.The TAC ASIC employs a counter in combination with an analog voltage ramp,which significantly expands the range.The circuit is designed in a 180 nm CMOS technology,with a single TAC channel area of 400 μm×260 μm.The conversion period and sampling period of the overall circuit are controlled by external signals,and the range and resolution can be adjusted to suit applications in complex environments.Simulation results show that the TAC has a range of 6.4 μs at 20 MHz operating clock,a measurement resolution of 50 ps,a differential nonlinearity of ±0.05 LSB,and an integral nonlinearity of ±0.8 LSB.The TAC has good performance and is suitable for wide-range lidar ranging system.

关 键 词：激光雷达 飞行时间 时间间隔测量 时间-幅度转换器 专用集成电路 

分 类 号：TN958.98[电子电信—信号与信息处理]