Download PCB Design for Real-World EMI Control by Bruce R. Archambeault (auth.) PDF

By Bruce R. Archambeault (auth.)

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Traditionally, engineers would try different values of capacitor, ferrite. etc. until the emissions were low enough to pass the requirements. Often, while trying various combinations of components, they would observe the signal of interest reduced, but another frequency signal unexpectedly raised above the limits! Unknowingly, they were simply tuning the resonances of the various parasitic elements with their added circuit elements until they were lucky enough to arrive at a combination that allowed the resonances to add or subtract in their favor.

Sometimes "ground" is used to mean power return/reference. Sometimes "ground" is used to mean chassis reference, and still other times "ground" means the safety connection to the building metal and ultimately connected to the earth. All of these double meanings are valid connections, but by labeling them all with the same name ("ground") and a multitude of symbols the specific function in the design is totally confused and often misused. A more descriptive name should be used so to eliminate any confusion during design discussions, and to help the designer think more clearly about the function intended.

Noise energy escapes these openings and causes RF 22 I PCB Design For Real-World EMI Control current on the outside of the enclosure, cables, etc. in a complex pattern. ) will radiate more or less efficiently. The radiation does not necessarily leave the opening, seam, or air vent and radiate directly to the receive antenna. This is why emissions often seem to come from a comer of the enclosure where there is no opening, or even from a metal side panel with no seams. The radiation direction is determined by the entire external system, not the point of leakage.

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