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1、6-6MeasurementsofDigitalSignalDelayVariationDuetoDynamicPowerSupplyNoiseMitsuyaFukazawaandMakotoNagataDepartmentofComputerandSystemsEngineering,KobeUniversity1-1Rokkodai-cho,Nada-ku,Kobe657-8501,Japan{fukazawa,nagata}@cs26.scitec.kobe-u.ac.jpAbstractOn-chip100-ps/100-μVw
2、aveformaccuratemea-surementsonsignaltransitioninalarge-scaledigitalcircuitsclearlydemonstratethecorrelationofdynamicdelayvariationwithpowersupplynoisewaveforms.AnapproximatelylineardependenceofdelayincreasewithdropheightholdsundertheexistenceofstaticIRdrop,however,thecoe
3、f?cientofdelayincreaseisstronglyin?uencedbyadynamicpowersupplynoisewaveform.Anothercauseofdelayvariationisfoundasadistortionofsignalwaveformsduringlogictransitionbydynamicpowersupplynoise,wheretheprocessissensitivenotonlytoanoisewaveformbutalsotoarelativetimedifferenceam
4、ongvictimandaggressorpairs,whichcanbegenerallyfoundinadesignwithmultipleclockdomains.Fig.1.Signaldelayvariationduetopowersupplynoise,(a)resultingfromchangeineffectivedrain-to-sourcevoltageduetoastaticdrop,(b)resultingfromdistortionoflogicsignalwaveformduetoadynamicdrop.I
5、.INTRODUCTIONSignalintegrityisofcontinuousconcernamongsub-100-nmCMOSdesignswhereitwillbemorestronglycorrelatedtimedifferencebetweeninputandoutputsignalsatthemid-withpowersupplyintegrity.Delayvariationisonerealityofpointofthesignalwaveforms,thedelaycanvarywhenathesignalin
6、tegrity,andnumerouspublicationshaveaddressedvictimsignalisdynamicallyshapedduetoadynamicsupplydelaychangeintermsofsignalcrosstalkthatresultsfromdropcausedbyanaggressorswitchingoperation.Here,wecancapacitiveand/orinductivecouplingsbetweenmetallicsignal?ndananalogywiththec
7、rosstalkdelay,althoughthedrivingwirings,whichisoftencalledcrosstalkdelay.Measurementsstrengthofavictimlogicelementisalsoaffectedbypowerofcrosstalkdelaywithrespecttoaggressorandvictimtimingsupplynoiseatthesametime.differencehavebeenreported[1][3],whicharequitehelpfulThisp
8、apertriestounderstandthedelayvariationduetotovalidatemodelingandsimulationtechniques.adynamicpowersuppl
