Electromagnetic Field Basics
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Contributor: Contributed by Douglas G. Brooks, MS/PhD of UltraCAD Design Inc. Format: PDF Document PCB designers, and others who don’t have a lot of background in EMC issues, usually don’t have a good understanding of electromagnetic fields. So electromagnetic fields often get a bad rap. But in fact, they are neither good nor bad, per se. ANY (AC) signal traveling along a trace generates an electromagnetic field. It is the effect of this field that can be good or bad. This article looks at the basic concepts of EMI, EMC, crosstalk, inductance, ground bounce, and RF communications and shows how they are all interrelated. The article also shows why there only a relatively few PCB design rules we have available to us for controlling the signal integrity issues related to electromagnetic field radiation, but why those rules can be effective. |