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电磁干扰和无线电干扰PCB设计EMI/RFIBoardDesignEMI/RFIBoardDesignNationalSemiconductorApplicationNote643JoeCocovichApril2001INTRODUCTIONThecontrolandminimizationofElectro-MagneticInterference(EMI)isatechnologythatis,outofnecessity,growingrapidly.EMIwillbedefinedshortlybut,fornow,youmightbemorefamiliarwiththetermsRadioNoise,ElectricalNoise,orRadioFrequencyInterference(RFI).Thetechnology’sexplorationsincludeawidefrequencyspectrum,fromdcto40GHz.ItalsodealswithsusceptibilitytoEMIaswellastheemissionsofEMIbyequipmentorcomponents.EmissioncorrespondstothatpotentialEMIwhichcomesoutofapieceofequipmentorcomponent.Susceptibility,ontheotherhand,isthatwhichcouplesfromtheoutsidetotheinside.InHPCdesignstodat……