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EMC for Product Designers, 4th Edition by Tim Williams

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Chapter 11 Layout and grounding

Designing for good EMC starts from the principle of controlling the flow of interference into and out of the equipment. You must assume that interference will occur to and will be generated by any product which includes active electronic devices. To improve the electromagnetic compatibility of the product you place barriers and route currents such that incoming interference is diverted or absorbed before it enters the circuit, and outgoing interference is diverted or absorbed before it leaves the circuit. A good analogy is to think of the circuit as a town, and the EMC control measures as bypasses or ring roads. The interference (traffic) is routed around the town rather than being forced to flow through it; the ...

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