上海航天（中英文）2025，Vol.42Issue(3)：175-184,10.DOI:10.19328/j.cnki.2096-8655.2025.03.020
激光测距系统中基于FPGA的时间域ADC实现与应用
Implementation and Application of Time-domain ADC based on FPGA in Laser Ranging System
摘要
Abstract
In response to the design challenges engendered by the necessity to balance power consumption,volume,and cost in the system design of photoelectric sensors such as lidar and laser ranging,a time-to-digital conversion(TDC)circuit is constructed through the employment of a low-cost Xilinx Spartan 6 FPGA,and a time-domain single-slope-type analog-to-digital converter(ADC)with a sampling rate of 1.25×108/s and an 8-bit resolution is attained.The actual measurement demonstrates that this time-domain ADC exhibits good linearity after calibration:differential nonlinearity(DNL)[-0.49,0.62]LSB,integral nonlinearity Least Significant Bit(INL)[-0.98,0.74]LSB.The highest effective bit reaches 6.2 bits,and the measurement range is[0.47,2.7]V.It is ascertained that only 13%of the FPGA SLICE is occupied.This time-domain ADC exploits the high-precision clock source CDCM61004(125 MHz,RMS Jitter<1 ps)as the system clock.The actual measurement manifests that when sampling a high-frequency signal of 50 MHz,the effective bit could reach 5.8 bits.When tested and applied in the laser ranging sensor,the time-domain ADC is capable of collecting the echo signals of the laser pulses and simultaneously obtaining the amplitude and time information of the echo signals,achieving a flexible and compact system design.关键词
时间域ADC/时间数字转换器(TDC)/非线性测试/直流特性/交流特性/激光脉冲回波信号采集Key words
time domain analog-to-digital converter(ADC)/time-to-digital converter(TDC)/nonlinear test/direct current measurement/alternating current measurement/echo signal measurement from laser pulses分类
信息技术与安全科学引用本文复制引用
周永亮,毛臻,唐俊..激光测距系统中基于FPGA的时间域ADC实现与应用[J].上海航天（中英文）,2025,42(3):175-184,10.基金项目
国家重大科技专项资助项目(2023HZ023008) （2023HZ023008）
