摘要
全数字双混频鉴相技术(DDMTD)是一种高精度的相位检测技术,在White Rabbit中主要负责完成两路同周期信号的高精度相位差检测。在全数字双混频鉴相技术中,可以根据实际功能进行功能模块划分,信号采样放大模块中通常使用D触发器将输入信号的周期进行采样放大,但会存在明显的亚稳态问题。本文主要通过改进DDMTD中信号采样放大模块的设计方案来降低亚稳态对鉴相结果的影响,减小DDMTD相位差检测误差。实验采用40 MHz信号进行测试实验,经过原方案与改进方案的结果比对可以得出改进方案对于信号边沿毛刺问题的改善有着明显效果。
Digital dual mixer time difference(DDMTD)is a high-precision phase detection technology.In White Rabbit,it is mainly responsible for the high-precision phase difference detection of two same-cycle signals.In the DDMTD,function modules can be divided according to the actual functions.The signal sampling amplifier module usually uses a D flip-flop to sample and amplify the period of the input signal,but there will be obvious metastable problems.This paper mainly improves the design scheme of the signal sampling and amplifying module in DDMTD to reduce the effect of metastable state on the phase discrimination result and reduce the detection error of DDMTD phase difference.Our experiment uses a 40 MHz signal for the test experiment.By comparing the results of the original scheme and the improved scheme,we conclude that the improved scheme has a significant effect on the improvement of the signal edge glitch.
作者
崔广利
向渝
华宇
CUI Guang-li;XIANG Yu;HUA Yu(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;Key Laboratory of Precise Positioning and Timing Technology,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Electronics and Communication Engineering,University of Chinese Academy of Sciences,Beijing 101048,China)
出处
《时间频率学报》
CSCD
2021年第1期10-16,共7页
Journal of Time and Frequency
基金
中国科学院国家授时中心“青年创新人才”资助项目(国授发字〔2017〕48号)。
