Noise can start from inside or outside an RF/microwave circuit or system, but it’s controllable when adding filters and shields that target electromagnetic interference (EMI) and radio-frequency interference (RFI). Both types of components provide reasonable noise suppression and, with proper planning, add little to the size and cost to a design. But why use one noise-suppressing component rather than another—what’s the difference? Some suppliers offer EMI/RFI filters as
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