标签: bypass

Abstract:Thisarticleanswersmostofthecommonquestionsregardingdataconverters.PresentedinaclassicFAQformat,itaddressestopicsincluding:defininganADCandDAC,andunderstandingtheirprincipalfunctions;theNyquist,effectsofchargeinjection;techniquesfordigitalfiltering;interfacingtoaserialport,I²Cinterface,andSPI™interface;bitbanging;MICROWIREinterface;PCB(PC-board)layouttipsandguidelines;groundingtips;bypasscapacitor(s)'effectonperformance;debuggingADCaccuracy;anddebuggingnoisymeasurements.Maxim>AppNotes>A/DandD/AConversion/SamplingCircuitsKeywords:ADC,DAC,analogtodigital,digitaltoanalog,convertor,converter,dataconverter,dataconvertor,Sep24,2009glossary,FAQ,nyquist,chargeinjection,digitalfiltering,serialport,I2C,SPI,bitbanging,microwire,PCboardlayout,groundingtips,bypassAPPLICATIONNOTE801FrequentlyAskedQuestionsaboutDataConvertersAbstract:Thisarticleanswersmostofthecommonquestionsregardingdataconverters.PresentedinaclassicFAQformat,itaddressestopicsincluding:defininganADCandDAC,andunderstandingtheirprincipalfunctions;theNyquist,effectsofchargeinjection;techniquesfordigitalfiltering;interfacingtoaserialport,ICinterface,andSPIinterface;bitbanging;MICROWIRE……

thebypasscapacitorinhigh-speedenvironmentsTheBypassCapacitorinHigh-SpeedEnvironmentsSCBA007ANovember19961IMPORTANTNOTICETexasInstruments(TI)reservestherighttomakechangestoitsproductsortodiscontinueanysemiconductorproductorservicewithoutnotice,andadvisesitscustomerstoobtainthelatestversionofrelevantinformationtoverify,beforeplacingorders,thattheinformationbeingreliedoniscurrent.TIwarrantsperformanceofitssemiconductorproductsandrelatedsoftwaretothespecificationsapplicableatthetimeofsaleinaccordancewithTI’sstandardwarranty.TestingandotherqualitycontroltechniquesareutilizedtotheextentTIdeemsnecessarytosupportthiswarranty.Specifictestingofallparametersofeachdeviceisnotnecessarilyperformed,exceptthosemandatedbygovern……

capacitors_in_bypass……

ParasiticinductanceofabypasscapacitorsignalintegrityByHowardJohnson,PhDParasiticinductanceofabypasscapacitorYoucanestimatetheparasiticseriesinductanceofabypasscapacitorinamultilayerboardwithsolidpowerandgroundplanes.UseanapproximationfortheinductanceL1duetothechiplayout(Figure1,greenshadedregion).Then,assumingthatyouhaveconnectedand-groundbouncethatyourchipexperiencesbutnotthenoisecoupledontothepowerandgroundplanes.Thechippower-supplycurrentsflowingthroughtheimpedancesofL2andL1generatemostofthehigh-frequencypower-andground-planenoiseemanatingfromthestructureinFigure1.Power-andground-planenoiseinthefrequencyregionthatthebypasscapacitorscontrolisthereforeproportionaltoL2L1.TocomputeL2(blueregion),assum……

TheBypassCapacitorinhighspeedenvironmentTheBypassCapacitorinHigh-SpeedEnvironmentsSCBA007ANovember19961IMPORTANTNOTICETexasInstruments(TI)reservestherighttomakechangestoitsproductsortodiscontinueanysemiconductorproductorservicewithoutnotice,andadvisesitscustomerstoobtainthelatestversionofrelevantinformationtoverify,beforeplacingorders,thattheinformationbeingreliedoniscurrent.TIwarrantsperformanceofitssemiconductorproductsandrelatedsoftwaretothespecificationsapplicableatthetimeofsaleinaccordancewithTI’sstandardwarranty.TestingandotherqualitycontroltechniquesareutilizedtotheextentTIdeemsnecessarytosupportthiswarranty.Specifictestingofallparametersofeachdeviceisnotnecessarilyperformed,exceptthosemandatedbygovern……

bypasscapacitor1BuriedCapacitanceTM:Aselectronicdevicesgetfaster,printedcircuitboardsneedtobedesignedwithhighspeedoperationinmind.Considerationmustbegiventosuchdesignissuesaspowerdistribution,impedance,crosstalkandEMI,loaddistributionandboardstructure(Seealso“Appnotes:EnteringTheHigh-SpeedDomain”).BuriedCapacitanceTMcanbeutilizedtoimprovepowerdistributionandreduceEMIemissionsinhighfrequencydigitalapplications.CapacitanceBasicsAcapacitorisformedwhentwoconductivelayersareseparatedbyaninsulative(dielectric)material.Byapplyingdifferentvoltagestotheconductivelayers,energyisstoredinthedielectricmaterialwhichcanbereleasedrapidlytosystemcomponents.Theamountofenergy(capacitance)isproportionalto……

BasicCircuitsBypassCapacitors1BasicCircuits-BypassCapacitorsThistimeinBasicCircuits,Iwouldliketodiscussbypasscapacitors.Thisarticlewillexplainthefunctionofabypasscapacitor,whenitsappropriatetousethem,andwhatvaluesyoushouldconsiderusing.TheFunctionThedefinitionofabypasscapacitorcanbefoundinthedictionaryofelectronics.Bypasscapacitor:Acapacitoremployedtoconductanalternatingcurrentaroundacomponentorgroupofcomponents.OftentheACisremovedfromanAC/DCmixture,theDCbeingfreetopassthroughthebypassedcomponent.Inpractice,mostdigitalcircuitssuchasmicrocontrollercircuitsaredesignedasdirectcurrent(DC)circuits.Itturnsoutthatvariationsinthevoltagesofthesecircuitscancauseproblems……

HowtoselectbypassCAPsUltraCADDesign,Inc.ESRandBypassCapacitorSelfResonantBehaviorHowtoSelectBypassCapsDouglasG.Brooks,MS/PhDIntroductionIt’snonewsthatthebandpassrequirementsforpowersystemsonPCB’sareincreasingandthatpowersupplyimpedancerequirementsaregettingtighter.Bypasscapacitorfabricationandassemblytechniquesareimprovingandpushinghigherthenormalself-resonantfrequencieswehavetodealwith.ESR’s(equivalentseriesresistance)aredecreasing,pushingfurtherdownthefloorofthepowersupplyimpedancecurve.Allthishascreatedincreaseddebateastohowtotakeadvantageofthishigherself-resonantrequencyandlowerESR.OneargumentisthatlowerESRisthoroughlybeneficial.Anotheristhat,whilelowerESRlowerstheimpedanceattheminimump……

TheBypassCapacitorinhigh-speedenviromentTheBypassCapacitorinHigh-SpeedEnvironmentsSCBA007ANovember19961IMPORTANTNOTICETexasInstruments(TI)reservestherighttomakechangestoitsproductsortodiscontinueanysemiconductorproductorservicewithoutnotice,andadvisesitscustomerstoobtainthelatestversionofrelevantinformationtoverify,beforeplacingorders,thattheinformationbeingreliedoniscurrent.TIwarrantsperformanceofitssemiconductorproductsandrelatedsoftwaretothespecificationsapplicableatthetimeofsaleinaccordancewithTI’sstandardwarranty.TestingandotherqualitycontroltechniquesareutilizedtotheextentTIdeemsnecessarytosupportthiswarranty.Specifictestingofallparametersofeachdeviceisnotnecessarilyperformed,exceptthosemandatedbygovern……

摘要：敏感的模拟系统，如果没有足够的旁路来消除噪声，在系统的性能退化意外从一个电源运行将导致。本应用笔记提供了合适的技术来克服这个路障的洞察力。Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>BatteryManagement>APP4713Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>High-SpeedInterconnect>APP4713Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>Power-SupplyCircuits>APP4713Keywords:analog,digital,noise,AC,60Hz,powersupplyrejectionratio,PSRR,VoIP,ethernet,audioamplifier,clock,noise,bypass,filtering,LPF,low-passfilter,RFsystem,CMOS,camera,sensorchipMay11,2012APPLICATIONNOTE4713EliminateNoiseThroughProperSupplyBypassFilteringBy:WalterChen,PrincipleMemberoftheTechnicalStaff,ApplicationsMay11,2012Abstract:I……