【摘要】 介绍了基于FPGA(Field-Programmable Gate Array)实现高精度时间间隔测量的系统结构及关键技术.采用锁相环对时钟源进行倍频、相移产生多路相关联的参考时钟,对短时间间隔进行双边沿采样测量,从而等效提高时钟频率,减小量化误差,提高了时间间隔测量的分辨率.最大分辨率可达625ps,测量范围优于20s,为更高精度的时间间隔测量提供更小的测量范围,从而为精细测量专注于更高的分辨率和测量精度打下基础.更多还原

【Abstract】 Introduced the system architecture and key technologies of high precision time interval measurement based on Field Programmable Gate Array(FPGA),which produce associated multiple reference clock by frequency,phase shift used PLL.For short intervals along the sampling measurement by both edges,which is equivalent to increase clock frequency,reduce the quantization error,increase the time interval measurement resolution with 625 ps optimization has been achieved in the measurement range more than 20s,which provides narrow range for ultra precise time interval measurement,thus the new precise measurement is more useful for focusing on the higher resolution and accuracy.更多还原