简介:1.IntroductionTheEMCdesignforthePrintedCircuitBoardhasbeenapopulartopic.Guidelinesandtipsforhigh-speedPCBdesignscouldbefoundfromnumerousresources.WheninvestigatingEMIissuesassociatedwithcircuitboards,manydetailssuchasclockfrequencies,switchingrates,rise/falltimes,signalharmonics,datatransferrates,impedances,traceloading,andtypesandvaluesofthevariouscircuitcomponents,shouldbetakenintoconsiderations.ThephysicallayoutofthePCboardanditsassociatedmetalliccomponentsareimportantconsiderations.Specialattentionshouldbegiventotheplacementandcharacteristicsofsignalsourcecomponents,vias,