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PCB回流路径AnalysisofReturnCurrentPathforChip-Package-PCBCo-Design(kamdong@ieee.org)KAIST(http://tera.kaist.ac.kr)2005.10.5TerahertzInterconnectionandPackageLaboratoryTERATerahertzInterconnectionandPackageLaboratoryWhatisReturnCurrent?9Electromagneticfieldsinparallelplates(TEMmode)yxzrJS,upperrrn×H=JS)×(xJS,upper=(yVVojkze)=oejkzzηdηdEyrHrJS,lowerJS,lower=Vojkz=JS,upperezηd9Currentinterpretation(1D)offieldpropagation(3D)SignalCurrent1.Foreverysignalcurrenttheremustbeanequalandoppositereturncurrent.2.Subsequently,thereturncurrentisequallyasimportantasthesignalcurrentforsignalintegrityandEMCanalysis.3.Averycommonmistakeistofocusonprov……