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ID:7888708
大小:1.03 MB
页数:14页
时间:2018-03-01
《sonnet signal integrity in multilayer boards外语英文电子书》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、SignalIntegrityinMultilayerBoardsSimulationofaModelImportedfromCadenceAllegro®Dr.JamesR.WillhiteImportModelsfromCadenceAllegro®Multilayerdigitalboardsarecomplexstructurestolayoutoftenhaving100’sor1000’sofnets.Astheclockrateshaveincreasedthevarioussignallinesnowmustbedesignedtoincludecouplin
2、gandothermicrowave-likeeffectswhichwerepreviouslyignored.MicrowaveStudiocanimportmodelsfromCadenceAllegroandthesignallinesanalyzedforeffectsinfluencingsignalintegrityto20GHzandbeyond.Thesehigherfrequenciesarerequiredforthenewerapplications.22LayerBoard(Multi-channel10GXFP)ImportedfromCadenc
3、eAllegrobyJimAntonellisofSandburstCorporationandshownwiththeirpermission.2SonnetSoftware,Inc.(315)453-3096mwssupport@sonnetsoftware.comImportBoards,Nets,orRegionsCompleteboarddesignscanbequitelargemodelsandoftenyouneedtostudySIeffectsinonlyalimitednumberofthenets.UsingtheAllegrointerfacetoM
4、WSyoucanchosetobringintheentiredesign,onlycertainregions,oronlycertainnets.Ifyouchosetoimportaregionoftheboardthiscanbetheareainsideageneralpolygon.Ifyouimportselectednets,youcanbringinstructureswithinasetradius.ForthisstudydonewithSandburst,onlyselectednetswereexportedfromtheentireboarddes
5、ign:two,balancedlinepairswithviastoalowerlayerintheboard.Thegoalisastudyofsignalintegrityforthesedifferentiallinepairsinanunpopulatedboard.3SonnetSoftware,Inc.(315)453-3096mwssupport@sonnetsoftware.comViaDownA22-LayerBoardThelinesforeachdifferentialpairpassdownintoalowerlevelintheboardthrou
6、ghvias.ThevariousdielectricandmetallayerscameintoMWSinastraightforwardmannerfromAllegro.Inthesectionedviewshowntotheleftthedielectricsarehidden.Themetalforthesignalpathisshowninyellow,thatofgroundandsignallayersisgrey,andthepowerplanesareorange.Youcanseethattheviasarecomplexstructureswithpa
7、dsandantipadsateachlayerandwithashortstubattheend.Allofthesefeaturescouldscattersignalanddegradethesignalintegrity.4SonnetSoftware,Inc.(315)453-3096mwssupport@sonnetsoftware.comCurrentOnAViaInA22-LayerBoardThisfigureshowstheinstantaneouscurrentat10GHzont
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