差分线对的pcb设计要点.doc

------------------------------------------------------------------------------------------------ ——————————————————————————————————————差分线对的 PCB 设计要点 2010 年第 06 期,第 43卷通信技术 , ,2010 总第 222 munications Technology ,Totally 邱剑(中国电子科技集团公司第 30 研究所,四川成都 610041 ) 【摘要】信号完整性是高速数字系统中要解决的一个首要问题之一,如何在高速 PCB 设计过程中充分考虑信号完整性因素, 并采取有效的控制措施, 已经成为当今系统设计能否成功的关键。在这方面, 差分线对具有很多优势,比如更高的比特率, 更低的功耗, 更好的噪声性能和更稳定的可靠性等。目前, 差分线对在高速数字电路设计中的应用越来越广泛,电路中最关键的信号往往都要采用差分线对设计。介绍了差分线对在 PCB 设计中的一些要点, 并给出具体设计方案。【关键词】差分线对; PCB 设计;信号完整性【中图分类号】 TN91 【文献标识码】 A 【文章编号】 1002-0802(2010)06-0221-03 Essentials of Differential Pairs in PCB Design QIU Jian ( Institute of CETC, Chengdu Sichuan 610041, China) 【 Abstract 】 Signal integrity is one of the principal pro blems to be ------------------------------------------------------------------------------------------------ —————————————————————————————————————— solved in the high-speed digital system. How to fully consider SI and take effective measures has been a key factor for the system design. In this point, differential pairs have many superiorities, including such as high |speed, low power dissipation, improved noise margin and reliable stability. At present, differential pairs have been more and more widely applied in high-speed digital design. The most critical signals in circuits are usually designed with differential pairs technique. In this paper,