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Understanding&OptimizingEMCinSMPSUnderstandingandOptimizingElectromagneticCompatibilityinSwitchmodePowerSuppliesBobMammanoandBruceCarstenABSTRACTElectromagneticnoiseissueshavelongbeenaconcernwithswitchingpowersupplies,astheirhighfrequencyswitchingofvoltageandcurrentgeneratehigherorderharmonicsthathavethepotentialtocauseinterferencewithsystemoperation.Whileinternationalspecificationsandstandardizedtestingprocedureshaveatleastprovidedagreaterunderstandingoftheproblems,optimumsolutionsmuststillcomefromtechniquesthatareappliedduringthedesignprocess.ThistopicattemptstodescribethemoresignificantcausesofEMIinpowersuppliesandofferdesigntechniquestominimizetheirimpact.I.INTRODUCTIONWhileswitchmodepowersuppliesarewellknown……