Twisted-Overlap Differential-Pair Approach to Increase Available Layout Space and Reliability in PCB Design

Abstract:

Modern electronic products require many high-speed differential pairs which require more layout space in PCB design. We propose a twisted-overlap differential-pair (TODP) structure to obtain more routing space and achieve better signal integrity in this study. TODP reduces the layout space requirement by about 25% compared with that required by traditional differential pairs and the twisted differential lines (TDL) structure [2]. Based on an eye diagram performance the TODP design compared to the traditional and TDL designs can improve the peak-to-peak jitter by 26.5% and 12.2%, the overshoot by 14.3% and 2%, the undershoot by 18.8% and 5%, and the eye width by 2 and 1%, respectively. Our results indicate that TODP may be of great benefit in differential-pair PCB design.

• Periodical: Applied Mechanics and Materials (Volumes 284-287)
• Pages: 2531-2537
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.284-287.2531
• Online since: January 2013
• Authors: Chiu Ching Tuan, Sun Yen Tan, Wen Tzeng Huang, Hung Li Tseng
• Keywords: Eye Diagram, High-Speed Differential Pairs, Layout Space, Signal Integrity, Twisted-Overlap Differential-Pair

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