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A Jitter Measurement Technique for Digital Ultra-High-Definition-Video Signals
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摘要: 针对数字超高清视频基带信号的抖动参数测量开展研究，设计了高速串行数字接口(SDI)信号的测量方法，采用改进后的双狄拉克模型来测量信号中的抖动，并解调SDI中的时钟信号作为测量时间基准。该方法可以准确地分析SDI信号中不同的抖动分量，采用时域测量方法，将信号抖动测量溯源到时域脉冲波形参数。通过实验验证了该方法的可行性，测量结果表明，该方法比直接频谱测量法具有更高的测量精度。Abstract: In this paper, jitter-parameter measurement of digital Ultra-High-Definition-Video (UHDV) baseband signals is studied. We design a high-speed Serial-Digital-Interface (SDI) signal measurement method which adopts an improved dual-Dirac model to measure the jitter in the signal. Also we have designed a relevant hardware circuit to demodulate the clock signal in the SDI, which is then used as the measurement time reference. The method can accurately analyze different jitter components in SDI signals and make signal jitter measurement traceable to time-domain pulse waveform parameters by using the time-domain measurement method. The feasibility of this method was verified by experiments. The measurement results showed that this method has higher measurement accuracy than a direct spectrum measurement method.
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图 3 抖动统计直方图和双狄拉克模型原理图
Figure 3. A statistical histogram of jitters witha schematic of the dual-Dirac model
图 4 叠加在双狄拉克模型上的TIE分布
Figure 4. Illustration of a distribution of TIE jitter values overlapped on the dual-Dirac jitter model
图 5 信号跳变时间三次内插计算示意图
Figure 5. Using an interpolation method to identify the arrival time of each edge
图 7 提取数据相关性抖动(
$ {DD}_{j} $ )直方图Figure 7. Extracting data-correlation jitters (
$ {{D}{D}}_{{j}}) $ 表 1 抖动测量数据
Table 1. Jitter measurement data
Tj Dj Rj 信号发生器输出 1.760 ns 360 ps 100 ps 双狄拉克模型频谱直接测量法 1.913 ns 347.5 ps 111.3 ps 改进的双狄拉克模型 1.699 ns 358.5 ps 95.3 ps 
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