一种新的短时间间隔测量方法

Novel short time interval measurement method

提出了一种基于延迟线技术的短时间间隔测量新方法.利用延迟链产生均匀延迟的多路参考频率信号,在由短时间间隔形成的闸门下对其计数,以计数值的平均数作为参考频率计数值,降低测量误差1-2个数量级.理论分析表明新方法的短时间间隔测量误差取决于延迟单元延时.实际测量数据表明,在参考频率为200 MHz,延迟单元延时为500 ps时测量误差小于500 ps,同等条件下测量精度比脉冲填充法高10倍.相比模拟内差法、时间-电压变换法和游标法等,新方法实现简单、成本低廉,具有良好的实用性.

A new method for short time interval measurement based on the delay line principle is presented. By utilizing a group of delay lines to generate multi-path reference frequency signals delayed uniformly in a reference frequency period, then counting them under the same gate generated by the short time interval, with the average as the count of the reference frequency, the measurement error can be reduced by 1-2 orders of magnitude. Error analysis shows that its accuracy is determined by the delay time of the delay unit. Actual measurement data show that when the reference frequency is 200MHz, the delay time of the delay unit is 500ps, its accuracy is better than 500ps and improved by 10 times compared with the pulse-filling measurement method under the same condition. Compared with the analog interpolating, time-to-voltage conversion and time vernier method, the proposed new method has the characteristic of easy implementation, low cost and high feasibility.