嵌入式应用系统中高速PCB设计技术的研究及实现

Design of High-speed PCB Technology in Embedded Application System

摘要:

为了能够消除高速PCB技术中信号完整性的问题,需要在高速PCB设计过程中解决时序、噪声、电磁干扰等关键问题；通过对嵌入式RTU的高速PCB设计过程中出现的串扰、电磁干扰、振铃和电源完整性等信号问题的研究,提出削弱或消除以上噪声的方法；用Altium Designer、PADS软件绘制电路原理图和PCB,借助Hyper Lynx和ADS仿真软件进行前端和后端可靠性验证,根据仿真结果确定元器件和接插件的布局以及走线规则,最后通过对完成布线的PCB进行信号完整性验证；设计的嵌入式RTU电路板通过电磁兼容测试,表明该方法能够有效抑制噪声,增强高速数字电路设计的稳定性,提高产品设计的成功率,对从事相关工作的人员有很重要的参考价值,在智能设备的升级替换和推进物联网的建设方面有重要的借鉴作用。

Abstract:

In order to eliminate the incompleteness of signals in high-speed PCB technology, there are some key issues should be solved, including timing, noise, electromagnetic and so on, in the design process of the high-speed PCB technology. In the process of high-speed PCB of embedded RTU, this paper studies the problems like crosstalk, electromagnetic interference, ringing effect and power integrity and so on, and proposes the ways to weaken or eliminate those noises. Circuit schematics and PCB are drawn by using Altium Designer, PADS software and the reliability of the front and rear parts is verified by means of Hyper Lynx and ADS simulation software. At the same time, the layout of components and connectors and wiring rules are determined based on the simulation results. Finally, this paper verifies the completeness of signal through the wiring of the PCB. The electromagnetic compatibility test shows that this method can suppress noise effectively, enhance the reliability of high-speed digital circuit design, and increase the success rate of product design, having a great reference value for the personnel engaged in related work. And there are important references in the replacement and upgrade of smart devices and promotion of networking building. 