用离散元件代替20-H规则的印刷电路板边缘端接的有效性分析

M. Montrose, Liu Enxiao, E. Li
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引用次数: 5

摘要

随着对更高工作频率的需求不断增加,工程师在设计周期中面临着许多障碍,特别是印刷电路板(PCB)的布局。问题包括时域和频域分析。对于时域分析,SPICE是最受欢迎的选择,而对于频域,根据应用情况使用各种场求解器。有一个设计问题不能单独使用SPICE或现场求解器来模拟——20-H规则。单个仿真工具不能使用的原因是由于使用传输线理论(时域)终止射频传播场(频域)。元器件在PCB板上的放置及其与电路板边缘的物理距离可能会导致产生不希望的射频传播场。本文分析了作为传输线的一对电源和返回平面之间的传播电磁场。通过适当的分析,可以使用离散元件将射频场的最佳传输线终端结合起来,而不是盲目地实施20-H规则(提供相同的好处)。对于特殊应用,可能需要20-H规则,但仅在PCB的某些位置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis on the effectiveness of printed circuit board edge termination using discrete components instead of implementing the 20-H rule
With increasing demand for higher operating frequencies, engineers are faced with numerous obstacles during the design cycle, especially the layout of a printed circuit board (PCB). Concerns include both time and frequency domain analysis. For time domain analysis, SPICE is a favorite choice, while for the frequency domain, various field solvers are used, depending on application. There is one design concern that cannot be simulated using either SPICE or field solvers exclusively - the 20-H rule. The reason why a single simulation tool cannot be used is due to termination of an RF propagating field (frequency domain.) using transmission line theory (time domain). The placement of components on a PCB and their physical distance to the edge of the board may cause an undesired RF propagating field to be created. The paper analyzes propagating electromagnetic fields between a pair of power and return planes behaving as a transmission line. With proper analysis, one can incorporate optimal transmission line termination for RF fields using discrete components instead of blindly implementing the 20-H rule (provides the same benefit). For unique applications, the 20-H rule may be required, but only in certain locations of the PCB.
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