摘要
针对高速电路系统的传输线信号完整性问题,通过对高速电路PCB上传输线等效电路的分析,给出了信号传输时产生反射现象的原因;介绍了常用的消除反射的方法,即选择均匀传输线、采用合适的拓扑结构布线和阻抗匹配法,指出阻抗匹配法可解决信号传输的反射现象;阐述了源端阻抗匹配法和负载端阻抗匹配法消除反射的原理和适用条件。针对时钟电路中的反射问题,采用PADS/Hyperlynx软件对阻抗匹配法进行仿真,结果表明,阻抗匹配法能够改善信号传输的反射现象。
In view of problem of signal integrity of transmission line in high-speed circuit system, the paper gave reasons of reflection phenomenon produced in signal transmission through analysis for equivalent circuit of transmission line on PCB of high-speed circuit. It introduced common methods of eliminating the reflection, namely selecting uniform transmission line, using proper topology of wiring and impedance matching method, and indicated that the impedance matching method can solve the reflection phenomenon in signal transmission, and expounded principles of eliminating the reflection and applicable condition of impedance matching method of source-end and impedance matching method of load-end. In view of reflection problem in clock circuit, the paper used PADS/Hyperlynx software to make simulation for the impedance matching method, the result shows that the impedance matching method can improve the reflection phenomenon in signal transmission.
出处
《工矿自动化》
北大核心
2014年第3期49-52,共4页
Journal Of Mine Automation
基金
国家自然基金资助项目(U1261125)
关键词
传输线
信号完整性
反射
阻抗匹配
transmission line
signal integrity
reflection
impedance matching
