中文摘要：

提出了一种基于延迟链技术的频率测量新方法。利用被测频率产生计数闸门，利用延迟链产生均匀延迟的多路参考频率信号，在同一闸门下对其计数，以其平均数作为参考频率计数值，降低了±1计数误差，对其进行误差分析表明其频率测量精度决定于延迟单元延时及其误差。实际测量数据表明在参考频率为200MHz，对延迟单元延时标定为0．5ns时其频率测量精度同比多周期同步法提高8倍。相比模拟内差法、时间-电压变换法和游标法等，该方法实现简单、成本低廉，具有良好的实用性。

英文摘要：

A new method for frequency measurement based on delay chain principle is presented. By utilizing respectivily frequency under test and a delay chain to generate the count gate and multi-path reference frequency signals delayed uniformly which are counted using the same gate, with the average as the count value of the reference frequency, the ± 1 count error is reduced. Error analysis shows that the measurement accuracy is determined by the delay time of the delay unit and its error. Actual measurement data show that when reference frequency is 200 MHz and the delay time of the delay unit is 0.5 ns, the accuracy is improved by 8 times compared with synchronal multi-period measurement method un- der the same condition. Compared with analog interpolation, time-to-voltage conversion and time vernier methods, the proposed method features simple to implement, low cost and good practicability.