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DC25_PAPER_TRACK07_IntrapairSkewElectricalDelayCompensation_Zhang_V2.pdf

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1、 Information Classification:General Intra-pair Skew Electrical Delay Compensation for PCIe 6.0 Xinjun Zhang,Intel Corporation Wenwu Wang,Intel Corporation Kai Xiao,Intel Corporation Chenghai Yan,Intel Corporation Information Classification:General Weizhe Li,Intel Corporation Jingbo Li,Intel Corporat

2、ion Mo Liu,Ph.D Xiaoning Ye,Intel Corporation Information Classification:General Abstract This paper explores how to do electrical delay compensation for PCB intra-pair skew for PCIe 6.0.It introduces a Compensation Coefficient(CC)to correlate electrical delay with physical length.Through Design of

3、Experiment and Response Surface Method analysis,it is found that the CC remains nearly constant when specific values are set for PCB core thickness and saw-tooth structure height.Additionally,the CC is shown to be insensitive to variations in PCB material,trace geometry,and layer stackup.Two look-up

4、 tables are provided to assist layout engineers in performing electrical delay compensation in the main routing region and the pin-field breakout region,respectively.Author(s)Biography Xinjun Zhang is technical lead in Intel,he received the Ph.D.degree in electrical engineering from Xidian Universit

5、y,Xian China,in 2000.From 2000 to 2004,he served as a Post-doctoral Fellow at Shanghai Jiaotong University and Nanyang Technological University.Since joining Intel Corporation in 2004,he has worked as a Signal Integrity Engineer.His primary research interests include signal integrity,power integrity

6、,EMC modeling,and computational electromagnetics.Wenwu Wang is a signal integrity engineer in Intel Corporation,he received the M.S.degree from Xidian University in 2020 and B.S.degree from the Changchun University of Science and Technology in 2017.His current research interests focus on signal inte

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1. **电气延迟补偿必要性**:PCIe 6.0中,电气延迟补偿比物理长度补偿提升眼高约0.8 mV(占眼罩要求的12%),显著改善信号完整性。 2. **补偿系数(CC)**:引入CC(源结构EPM与锯齿结构EPM之比),在PCB核心厚度和锯齿高度固定时,CC值稳定(如主路由区1.47,引出区3.25/2.92),且不受材料、几何形状影响。 3. **应用规则**: - 主路由区:50 mil源 skew 需73.5 mil锯齿补偿(CC=1.47)。 - 引出区:via fanout 9.57 mil源 skew 需27.9 mil锯齿补偿(CC=2.92,2.5S高度)。 4. **设计简化**:提供查找表(表6、9),指导工程师快速补偿,适用于112G/224G等高速接口。
**PCIe 6.0为何需电气延迟补偿?** **如何补偿PCB对内差分对延迟?** **锯齿结构如何优化信号完整性?**
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