高速PCB设计的经验法则  

High-speed rules of thumb

作　　者：Barry OLNEY 无 Barry OLNEY;无(不详;ECIO Editorial Team)

机构地区：[1]不详 [2]“电子首席情报官”编辑组

出　　处：《印制电路信息》2025年第3期66-70,共5页Printed Circuit Information

摘　　要：探讨“经验法则”(rules of thumb)在高速印制电路板PCB设计中的应用,强调这些基于实践而非理论且易于记忆、大致准确的指南或原则,在缺乏昂贵分析工具时的重要作用。详细介绍在传输线、叠层、返回电流路径、串扰、信号完整性等方面的经验法则,包括阻抗匹配、走线布局、电流密度、电磁场影响等关键因素。同时,指出经验法则具有局限性,即“规则是用来打破的”,每个PCB设计都可能需要打破至少一条法则,以适应特定情况。This paper explores the application of"rules of thumb"in high-speed PCB design,emphasizing the importance of these practical,easy-to-remember,and generally accurate guidelines or principles in situations where expensive analysis tools are unavailable.The article provides a detailed discussion on the rules of thumb related to transmission lines,layer stack-up,return current paths,crosstalk,and signal integrity,including key factors such as impedance matching,routing layout,current density,and electromagnetic field effects.It also highlights the limitations of these rules,noting that"rules are made to be broken,"as each PCB design may require breaking at least one rule to accommodate specific conditions.

关 键 词：高速PCB设计 经验法则 传输线 叠层 

分 类 号：TN41[电子电信—微电子学与固体电子学]