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1、RadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsinPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)Dr.ZoricaPantic-TannerDirector,SchoolofEngineeringDirector,CenterforAppliedElectrom。
2、agneticsSanFranciscoStateUniversityzpt@sfsu.eduFranzGisinManager,ElectromagneticCompatibilityNortelNetworksfgisin@nortelnetworks.comSCHOOLOFENGINEERINGMotivationProblemdefinitionProblemsetupPhysicsofPCBpropagationmodesPhysicsofPCBedgeeffectsMinimizingradiationfromPCBedgesRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsRadiationfromEdgeEffectsinPrintedCircuitBoards(PCBs)in。
3、PrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)inPrintedCircuitBoards(PCBs)MotivationMotivationMotivationMotivationMotivationMotivationMotivationMotivationAscompetitiveforcesdriveproductcostsdown,itbecomesincreasinglyimportanttoincorporategoodEMCdesignpracticesintotheproduct-especiallyonesthatprovidesuperiorsuppressionatminimumcost.BecausePCBlayoutpatterns(howtracesandground/p。
4、owerplanesarestackedandrouted)donotaddtoproductioncosts,thereisatremendousinterestinoptimizingthesestructurestoprovidemaximumEMCsuppression.ThematerialpresentedtonighthighlightssomeoftheongoingresearchinthisareathattheSFSUCenterforAppliedElectromagneticsiscurrentlyworkingoninconjunctionwithitsIndustryPartnershipProgram.MotivationMotivationMotivationMotivationMotivationMotivationMotivationMotivationIEEEEMCSocietyComputationalElectromagneticsTC-9identifiededgeemissionsasasignificantEMCriskphenom。
5、enon,andincludeditasoneofitsfourchallengingEMCmodelingproblems.Findtheedgeemissionsfromthefollowingstructure…..MotivationMotivationMotivationMotivationMotivationMotivationMotivationMotivationSolution(fromamodelingperspective)–Findabigfastcomputerwithenoughmemorytoholdtheentiremodel.–Takealongcoffeebreak….–ResultstobepresentedattheIEEE2000EMCSymposiumSolution(fromamodelingperspective–Findabigfastcomputerwithenoughmemorytoholdtheentiremodel.–Takealongcoffeebreak….Modelingentirestructureonacomp。
6、uterdoesnotprovideinsightintowhat’sgoingon.Ifwe“unbundle”theproblemintoitscomponentpieces,lookatthephysicsofeachcomponent,wecanusetheinsightgainedfromthisprocesstofigureoutwhatisgoingon.–Howbadisit?–Doesthe20Hrule(pullingbackpowerplanes)work?–Doesfencing(groundingviasaroundperipheryofPCB)work?–Arethesetheonlytwotechniquesatourdisposal?MotivationMotivationMotivationMotivationMotivationMotivationMotivationMotivationTraces[striplines(1),microstrips(2),andvias(3)]anddielectric(4)areusedtoroutetime。
7、-varyingcurrents(digitalsignals,etc.)aroundonPCBs.ProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinition(1)(2)(3)(4)Traces[striplines(1),microstrips(2),andvias(3)]anddielectric(4)areusedtoroutetime-varyingcurrents(digitalsignals,etc.)aroundonPCBs.Eveniftracesarenotroutedalongtheedge(5),radiationstilloccurs(6).ProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionPro。
8、blemDefinitionProblemDefinition(6)(1)(2)(3)(4)(5)Traces[striplines(1),microstrips(2),andvias(3)]anddielectric(4)areusedtoroutetime-varyingcurrents(digitalsignals,etc.)aroundonPCBs.Eveniftracesarenotroutedalongtheedge(5),radiationstilloccurs(6).Weconcludecurrentsinthetracescreateelectromagneticfieldsthatpropagatethroughthedielectrictowardstheedge(7).ProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinition(6)(7)(1)(。
9、2)(3)(4)(5)Traces[striplines(1),microstrips(2),andvias(3)]anddielectric(4)areusedtoroutetime-varyingcurrents(digitalsignals,etc.)aroundonPCBs.Eveniftracesarenotroutedalongtheedge(5),radiationstilloccurs(6).Weconcludecurrentsinthetracescreateelectromagneticfieldsthatpropagatethroughthedielectrictowardstheedge(7).Ifweunderstandhowthesefieldsarecreated,howtheypropagatetotheedge,andhowtheyradiateintothesurroundingspaceoncetheygetthere,wecandevelopeffectiveEMCguidelinestominimizeradiation.Problem。
10、DefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinitionProblemDefinition(6)(7)(1)(2)(3)(4)(5)Stationary(Electrostatic)Fields–i=dq/dt=0=chargeatrest–OnlyproducestaticE-fields–Example:ChargedcapacitorVelocity(Magnetostatic)Fields–i=dq/dt=constant(DCcurrent)–OnlyproducestaticH-fields–Example:SolenoidconnectedtoabatteryAcceleratingFields–di/dt=d2q/dt2≠≠≠≠0–Producetime-varyingradiatingelectromagneticfields[1],[2]**–Example:Anytimevaryingcurre。
本文标题:PCB电磁干扰算法
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