Effective Channel Budget Technique for High-Speed Channels due to Differential P/N Skew

Abstract

It is understood very well that at 20Gbps and beyond, P/N skew from fiber weave effect in printed circuit board (PCB) has to be taken into account. Several studies have been done to measure and quantify the effect of glass weave but very few have offered techniques to budget for P/N skew. System companies need an effective way to capture glass weave skew and budget for it in channel designs. Using transmission line theory, we analytically calculate differential loss due to P/N skew, study the effect of P/N skew on eye performance for SerDes IP and explore dependency of P/N skew on PCB materials. This paper studies effect on S-parameters, SerDes eye performance due to skew that can help SI engineer to effectively budget for P/N skew as part of channel link budget.

Meeting Name

2017 IEEE International Symposium on Electromagnetic Compatibility & Signal/Power Integrity, EMCSI (2017: Aug. 7-11, Washington, DC)

Department(s)

Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory

Keywords and Phrases

glass weave; high-speed digital signal; PCB material; skew

International Standard Book Number (ISBN)

978-1-5386-2229-2

International Standard Serial Number (ISSN)

2158-1118

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2017 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Aug 2017

Link to Full Text

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