| 陈星燎,高恩辉,刘通.一种测量误码率谱构建眼图的方法[J].电子测量与仪器学报,2024,38(3):219-229 |
| 一种测量误码率谱构建眼图的方法 |
| Measuring BER based method of building an eye-diagramChen XingliaoGao EnhuiLiu Tong |
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| DOI： |
| 中文关键词: 动态测试 误码率插值 眼图测量 Q尺度因子 |
| 英文关键词:dynamic measurement BER interpolation eye-diagram measurement Q-scale |
| 基金项目:天津市自然科学基金(21JCYBJC00670)项目资助 |
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| 中文摘要: |
| 当前生产线上自动化测试设备对高速串行电路接口只能进行通、断、短路传统静态测试，对眼图时域特征动态测试则难以在有限的生产节拍时间内完成。为了在生产线上低成本、快速地完成动态测试，开发了一个多相位、多判决电平的二维误码率统计电路，通过等误码率插值的方法来构建时域眼图。首先分析抖动的不同来源特征，根据双狄拉克模型得到抖动和误码率的关系，Q尺度因子和误码率P的关系，推导出Q-P曲线的切线斜率收敛到随机抖动均方根值σ的倒数。然后通过测量切线斜率求解σ，得到高斯随机抖动的模型。最后根据高斯模型对所有判决电平处的误码率曲线插值，求出二维误码率图谱上的等误码率点，连接这些点绘制眼图的内轮廓线。对高斯函数和眼图仿真数据以及实验测量的误码率数据进行计算分析表明，Q-P曲线斜率插值法在误码率小于10-4以下区域内能够恢复出眼图内轮廓线，可定量地评估眼高、眼宽、幅度、上升下降时间等基本眼图时域参数，相关数据精度误差在10%左右。 |
| 英文摘要: |
| At present, the automatic test equipment on the production line can only perform the traditional static test of on, off, and short circuit of the high-speed serial interface, and it is difficult to complete the dynamic test of the time domain characteristics of the eye diagram in a limited production cycle time. In order to complete the dynamic test at low cost and quickly on the production line, a two-dimensional bit error rate statistical circuit with multiple phases and multiple decision levels was developed, and the time domain eye diagram was constructed by the method of equal bit error rate interpolation. Firstly, the different source characteristics of jitter are analyzed, and the relationship between jitter and BER, the relationship between Q Scale and BER P is obtained according to the Dual-Dirac model, and the tangent slope of the Q-P curve converges to the reciprocal of the random jitter variance σ. Then, by measuring the tangent slope to solve the σ, the model of Gaussian random jitter is obtained. Finally, according to the Gaussian model the BER curves at all decision levels are interpolated at a giver BER, the equal points on the two-dimensional BER map are found, and these points are connected to obtain the inner contour line of the eye diagram. The calculation and analysis of Gaussian function, eye diagram simulation data and experimental data show that the Q-P curve slope interpolation method can rebuild the inner contour line of the eye diagram in the area below the BER less than 10-4, and can quantitatively evaluate the basic eye diagram time domain parameters such as eye height, eye width, amplitude, rise and fall time, and the accuracy error of the relevant data is about 10%. |
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