PCB玻纤效应仿真研究

Simulation analysis on PCB glass fiber effect

印制电路板(Printed Circuit Board,PCB)的信号完整性随着传输速率提升变得日益重要,信号广泛使用差分线进行高速传输线设计,在56Gb/s及更高速率时,玻纤效应导致的差分skew对插入损耗的影响变得不可忽视,但限于PCB制作误差,测试误差和制作成本高等,无法完整地得出玻纤效应在不同差分走线环境的结果,所以本文使用仿真软件,建立简化玻纤布模型,对玻纤效应进行仿真,测试不同走线长度,不同介电常数覆铜板搭配不同玻纤布组合下不同传输线旋转角度对skew的影响,并给出建议方案。本文使用仿真软件进行快速仿真,从而达到缩短PCB研发时间,提升产品的信号完整性的目的。

For PCB,signal integrity becomes more and more important as transmission rates increase,differential pair lines are widely used for high-speed transmission line design,the skew caused by the glass cloth effect on the insertion loss become significant.However,due to the high PCB production tolerance,testing deviation and production costs,the results of the glass cloth effect in different layout environments cannot be systematically obtained.Therefore,establish a model of PCB glass cloth in software and make simulation,analyzes the influence of skew in different length,different glass cloth,different rotation angles in different dielectric constant of CCL,then make conclusion,Based on the quickly simulation in software,this paper provides shortens the time of PCB study and enhances signal integrity performance.