Coupling of the Ground BounceNoise to the Signal trace with Via

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1、CouplingoftheGroundBounceNoisetotheSignaltracewithViaTransitioninPartitionedPowerBusofPCBJiunn-NanHwangandTzong-LinWuEMClaboratoryDepartmentofElectricEngineeringNationalSunYat-senUniversity,Kaohsiung,Taiwan,R.0.C.E-mail:wtl@mail.ee.nsysu.edu.twFax:886-7-5254199Abstractc

2、ouplingtotheoutsidecircuits.OneofthemistopartitionThispaperinvestigatesbothintimeandfrequencydomainspowerbuswithslits(orcalledmoats).Insomecaseslikethepowerplanenoisecouplingtosignaltracewithviatheclockbuffercircuitsinhigh-speedmotherboard,transitioninmulti-layerPCB.Pow

3、erplanenoiseorgroundbridgesconnectingbetweentowsidesoftheslitsforbouncenoisewillcausepowerplaneresonance,anditalsosupplyingsignalretumcurrentpathisnecessaIyforthecouplenoisetosignaltracewithviatransitionthroughhigh-speedtracescrossingthemoat.Severalworkshavepowerplanes.

4、Separatingpowerplanewithslitsiseffectivestudiedthebridgeeffectontheswitchingnoisecouplingoninreducingnoisecouplingathighfrequencybutanewthepartitionedpowerorgroundplanes[2],buttheresonantmodewillbeexcitedatlowerfrequency.Currenttheoreticalinvestigationoftheimpactofthepa

5、rtitioneddistributionpattemofthisnewresonantmodebetweenpowerbuswithorwithoutbridgesonthenoisecouplingpowerplaneshelpsustounderstandthisphenomenonmorethroughviastothesignaltracesoutsidethemoatshavenotclearly.Inthiswork,thereisgoodagreementbetweenthebeenseen..numericalpre

6、dictionbyFDTDmethodandmeasurementInthiswork,several4-layerPCBtestboardswithresults.signaltracestransitionedfromtoplayertobottomlayerthroughviaaredesignedwithdifferentpowerpartitions.1.IntroductionBasedonaFDTDmodelingapproach,theeffectofthepowerbuspartitiononthegroundbou

7、ncenoisecouplingGroundbouncenoiseremainsaseriousprobleminthroughtransitionedviaisnumericallyinvestigated,wheredigitalcircuitwithincreasingworkingfrequencyandpossible,thecouplingmechanismwillbeexplainedbythelayoutdensity.Itwillcausepowerplaneresonanceandcurrentdistributi

8、ononthepowerbus[3].BesidestheresultinsignificantsignalintegrityandEM1problems[I].modeling,experimentalmeasurem