标签: traces

差分线经典解析,DIFFERENTIALTRACES[1]……

TheeffectsofviasonPCBtracesUltraCADDesign,Inc.DESIGNNOTETHEEFFECTSOFVIASONPCBTRACESBackground:Throughtheyearswehaveworkedwithmanyengineerswhohavehadstrongfeelingsaboutthepresenceofviasoncriticaltraces(suchasfastrisetimeclocklines).Thesefeelingshaverangedfrom(a)theeffectsofviasaresonegligiblethattheymaybeusedfreely,to(b)theireffectsaresosignificantthatviasmaynotbeusedatall.Dependingonyourview,thesetwoextremesplacequitedifferentconstraintsonPCBdesigns!Itisclearfromthehistoryofalltheboardsthathaveeverbeendesignedinthepastthatviashavelittleimpactatlowerfrequenciesandrisetimes.Itisonlyrecently,asdevicerisetimesandtimingissuescausedbyfasterclockspeedshavebecomecriticalPCBdesignissue……