基于DSP时钟抖动测量系统的研究与实现

Research and Implementation of Clock Jitter Measurement System Based on DSP

介绍了一种基于DSP技术高精度抖动测量系统的实现方法,以DSP系统作为抖动测量系统的信号处理和控制的核心,该系统利用多相位数据转换跟踪环的方法可以对抖动进行高精度测量。系统设计方法是基于一种系统级电路,通过DSP算法模型和抖动误差的推导完成对系统的定制。利用Matlab可以进行仿真和验证。在采样周期相同的情况下,此种方法的测试精度相对于传统的模拟测量方法和单相位测量方法的测试精度提高很多(均方根误差最大时,只是传统方法的方根误差的1/6)。而且测量精度非常稳定,操作也很简单。

An approach for the realization of high precision jitter measurement system based on DSP technology is described.It takes DSP system as a core of signal processing and control for jitter measurement system.Through multi-phase data conversion tracking loop,this system can realize the measurement of jitter with high accuracy.This design is based on a system-level circuit.By deriving the error of DSP algorithm model and jitter,it completes system customization.The simulation and verification can be done taking use of Matlab.In the case of the same sampling period,the test accuracy of this method is improved compared to traditional analog measurement methods and single-phase measurement ones（RMS error is about one sixth of the conventional method）.In addition,Measurement accuracy is very stable the operation is simple.