基于常规计数型TDC设计思想,通过FPGA芯片的内部PLL延迟相位技术和内部资源构建延迟链改进常规计数型TDC,时间间隔测量精度可达200 ps.该方法对激光测距、三维激光扫描仪、绝对重力仪等仪器中精密时间测量系统的研究具有实际意义.%Design TDC based on the conventional counting TDC method,through use the FPGA chip's internal PLL phase delay and inner resource build delay chain technology improved TDC by counting method,can get a time interval measurement precision of 200 ps.The method has practical significance in the study of precision time measuring system for laser ranging,3D laser scanner,and absolute gravimeter instruments.
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