刘涛^{1, 2, 4},
陈国超^{1, 2, 4},
陈法喜^{1, 2, 3,,},
赵侃^{1, 2},
董瑞芳^{1, 2, 4},
张首刚^{1, 2, 4}
1.中国科学院国家授时中心 西安 710600
2.中国科学院时间频率基准重点实验室 西安 710600
3.西安电子科技大学 西安 710071
4.中国科学院大学 北京 100049
基金项目:中国科学院战略性先导科技专项(B类)(XDB21030200)，广东省重点领域研发计划项目(2018B030325001)

详细信息

作者简介:刘涛：男，1976年生，研究员，研究方向为高精度光纤时间频率传递、窄线宽激光器研制
陈国超：男，1993年生，硕士生，研究方向为高精度光纤时间同步、精密时间频率测量技术
陈法喜：男，1985年生，副研究员，研究方向为精密时间测量与时间同步
赵侃：男，1986年生，助理研究员，研究方向为精密时间间隔测量、光纤时间间隔测量传递设备
董瑞芳：女，1977年生，研究员，研究方向为量子时间同步、高精度时间频率传递、基于双飞秒光梳的高精度测距
张首刚：男，1966年生，研究员，研究方向为铯原子喷泉钟、锶原子光钟、新型星载原子钟、时间频率光纤及量子传递、物理常数精密测量

通讯作者:陈法喜　cfx2006xd@163.com

中图分类号:TM935

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被引次数:0

出版历程

收稿日期:2020-10-28
修回日期:2021-02-22
网络出版日期:2021-03-30
刊出日期:2021-09-16

Research on Dead-time Free Frequency Measurement Technology Based on TDC

Tao LIU^{1, 2, 4},
Guochao CHEN^{1, 2, 4},
Faxi CHEN^{1, 2, 3,,},
Kan ZHAO^{1, 2},
Ruifang DONG^{1, 2, 4},
Shougang ZHANG^{1, 2, 4}
1. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China
2. Key Laboratory of Time and Frequency Standards, Chinese Academy of Sciences, Xi’an 710600, China
3. Xidian University, Xi’an 710071, China
4. University of Chinese Academy of Sciences, Beijing 100049, China
Funds:The Strategic Priority Research Program of the Chinese Academy of Sciences (XDB21030200), The Research and Development Program in Key Areas of Guangdong Province (2018B030325001)


摘要
摘要:在精密时频测控领域中，高分辨率、无死区的时间间隔和频率测量非常关键，而时间数字转换器(Time to Digital Converter, TDC)是时间频率测量的常用手段。该文研制了基于ACAM公司生产的时间数字转换芯片TDC-GP21和Altera公司FPGA芯片EP4CE6E22C8N的时间频率测量设备，实现了高分辨率的时间间隔测量，测量分辨率达到13ps 。同时采用时间间隔测量模块两两组合的方式实现了无死区频率测量，创新性地采用每组3个TDC芯片，共4组搭建了时间频率测量系统，并对组内3个TDC芯片测量结果采用平均值滤波法，使频率测量稳定度达到$ 1.1 $×$ {10}^{-11} $@1 s, $ 5.6\times {10}^{-15} $@10000 s，与商用K+K FXE频率计数器指标相当。本设备具有体积小、无需校准、成本低等优点，能够广泛应用到高精度时间间隔和精密频率测量领域中。
关键词:频率测量/
时间间隔测量/
时间数字转换器(TDC)/
高精度/
无死区
Abstract:In the fields requiring precise time and frequency measurement and control, high-precision, dead-time free time interval and frequency measurements are highly demanded. TDC (Time to Digital Converter) is commonly adopted in time and frequency measurement. In this paper, a self-developed multi-module time-interval measurement system is built based on the time digital conversion chip TDC-GP21 from ACAM company and the Cyclone IV FPGA chip EP4CE6E22C8N from Altera Company. For each time-interval measurement module, a time-interval measurement resolution as small as 13 ps is achieved. By further duplex operating two such time-interval measurement modules, a dead-time free frequency measurement is realized, the time and frequency measurement system involves three groups, each of which has 3 TDC chips. By averaging the measurement results of three TDC chips in each group, a frequency instability reaches $ 1.1\times {10}^{-11} $@ 1s and $ 5.6\times {10}^{-15} $@10000 s. This result shows that this self-developed apparatus approaches the performance of the commercial K+K FXE frequency counter. Due to its advantages of small size, no calibration and low cost, this apparatus can be widely used in applications that require high-precision time interval and precise frequency measurements.
Key words:Frequency measurement/
Time interval measurement/
Time-to-Digital Converter (TDC)/
High precision/
Dead-time free



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