文档介绍：221 2010 年第06 期,第43 卷通信技术 ,,2010 总第222 munications Technology ,Totally ·其他· 差分线对的PCB 设计要点邱剑 (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 Di fferential Pairs in PCB Design QIU Jian ( Institute of CETC, Chengdu Sichuan 610041, China) 【Abstract】 Signal integrity is one of the principal problems 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 h igh |speed, low power dissipation, improved noise margin and reliable stability. At present, differential pairs h ave been more and more widely applied in high-speed digital design. The most critical signals in circuits are usual ly designed with differential pairs technique. In this paper, the essentials of differential pairs in PCB desi gn are described, and some specific design schemes are also given. 【Keywords】differential pairs;PCB design;signal integrity 0 引言差分线对是指一对存在耦合的传