标签: opamps

ActiveCompensationofOpamps

Abstract:Thisapplicationbriefdescribeshowtocontrolanalogphaseshiftdigitallyusingacombinationofdigitalpotentiometersandstandardoperationalamplifiers(opamps).Itisintendedtoserveasadesignexampleforengineersneedingtoimplementdigitalphaseshiftinacircuitrywithnospecificapplication.Itpresentscommonopampphaseshiftconfigurationsandhowtoimplementthemusingadigitalpotentiometerinplaceofmechanicalpotentiometersorfixedresistors.Formulasforcalculatingphaseshiftareincludedintheapplicationnote.ApplicationNote184Digitally-ControlledPhaseShiftUsingtheDS1669www.maxim-ic.comCONTROLLINGPHASESHIFTDIGITALLYAlteringthephaseresponseofasignalwithoutchangingitsamplitudecharacteristicsiscommonlyperformedusinganallpassfilter,asinFigure1.TheresponseofthiscircuitisgivenbyAsimplephaseshiftcircuitcanbeimplementedusinganallpassfilter.Figure1AsthesignalfrequencyvariesfromDCtoinfinity,thephaseshiftwillvaryfrom0to+180degrees.YoucanalsoseethatbyvaryingR1,thephaseshiftatagivenfrequ……

Abstract:Insomeelectronicsystems,aDCoffsetvoltageattheinputswillcontributeasignificanterrortotheoutput.Thisisespeciallytrueinhighgainconfigurations.Anoffsetadjustmentcircuitcanbeaddedto"null"outtheoffsetvoltage,makinghighgainstagespracticalevenwithsignificantinputoffsetvoltagesfoundinopampcircuits.Maxim>AppNotes>AmplifierandComparatorCircuitsDigitalPotentiometersKeywords:offsetadjust,offsetadjustment,opamp,nullingcircuits,nullingopamps,DCoffsetvoltage,Sep17,2001opampsAPPLICATIONNOTE803EPOTApplications:OffsetAdjustmentinOp-AmpCircuitsAbstract:Insomeelectronicsystems,aDCoffsetvoltageattheinputswillcontributeasignificanterrortotheoutput.Thisisespeciallytrueinhighgainconfigurations.Anoffsetadjustmentcircuitcanbeaddedto"null"outtheoffsetvoltage,makinghighgainstagespracticalevenwithsignificantinputoffsetvoltagesfoundinopampcircuits.ElectronicPotentiometers(EPOTS)offerdesignerstheopportunitytocontrolaresistanceviaadigitalinterfaceandcanbeusedinplaceofmechanical……

摘要：“Deboo”集成简化了使用单一供应地面参考输入和输出。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSMEASUREMENTCIRCUITSKeywords:deboo,Howlandcurrentsource,integrator,opamp,single-supply,opamps,singlesupply,Jul29,2002APPLICATIONNOTE1155Considerthe"Deboo"Single-SupplyIntegratorAbstract:The"Deboo"Integratorsimplifiestheuseofsingle-suppliesbyground-referencingboththeinputandtheoutput.Thedesignofstandardinvertingintegratorsissimplewhenbipolarsuppliesareavailable,butit'scumbersomewithaunipolarsupply.Toallowadequateheadroomfortheoutput,thecircuitmustbebiasedawayfromground,oftenathalfthesupplyvoltage.Becauseneitherinputnoroutputisreferencedtoground,thedesignisawkwardandoftenimpractical.OnesolutionisaHowlandcurrentsource……

摘要：为了减少功耗，单电源运算放大器驱动以地为参考的负载，连接一个上拉电阻，输出和正电源电压之间的负载电阻值等于。这除了使运算放大器工作在更高的环境温度和驱动低电阻负载，仅由输出电压和电流（而不是封装的功耗），其最大额定值的限制。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSKeywords:singlesupply,opamp,opamp,applicationcircuit,appnote,appnote,opamps,opamps,tutorial,Feb07,2003tutorialsAPPLICATIONNOTE1877OneResistorTakesHeatfromSingle-SupplyOpAmpsAbstract:Tominimizethepowerdissipationinasingle-supplyopamp,drivingaground-referencedload,connectapullupresistor,withvalueequaltotheloadresistorbetweentheoutputandthepositivesupplyvoltage.Thisadditionenablestheopamptooperateathigherambienttemperaturesanddrivelower-resistanceloads,limitedonlybyitsmaximumratingsforoutputvoltageandcurrent(ratherthanthepackagepowerdissipation).Tomaximizesignalswing,theoutputofasingle-supplyopampisusuallybiasedathalfthe……

摘要：建立运算放大器引入了一个新的基本组成部分，标志着模拟设计师的思维变化。因为它是如此广泛的应用，几乎任何运放电路，工程师需要实现已经被设计工程师可以只是裁缝的元件值。这种方法虽然快速，并不总是意味着设计师电路的操作理论的一个基本的了解。本应用笔记介绍如何可以通过简单的节点分析过程中所产生的大多数运放电路的传递函数。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSKeywords:nodalanalysis,opampcircuits,circuitanalysis,opamps,transferfunctionofanopamp,opamps,Mar20,2003opampAPPLICATIONNOTE1939NodalAnalysisofOpAmpCircuitsAbstract:Thecreationoftheopampintroducedanewfundamentalcomponentandmarkedachangeinthinkingforanalogdesigners.Sinceitissowidelyused,prettymuchanyopampcircuitthatanengineerneedstoimplementhasalreadybeendesignedandtheengineercanmerelytailorthecomponentvalues.Thisapproach,althoughquick,doesnotalwaysmeanthedesignerhasafundamentalunderstandingofthetheoryofthecircuitoperation.Thisapplicationnoteexplainshowthetransferfunctionofmostopampcircuitscanbederivedbyasimplepro……

数值分析电路并不意味着你要购买昂贵的模拟器。使用Microsoft®Excel的功能，通常可用的工程师的计算机上，很容易你可以很多常见的电路计算。虽然这不会取代你最喜欢的口味，它可以是香料的一个强大的工具，以解决专门的问题，或获得的直觉。Maxim>AppNotes>AmplifierandComparatorCircuitsKeywords:PSPICEmodelingopamps,opampSPICEmodels,non-idealopampsimulation,circuitanalysis,Mar25,2003opamps,opampAPPLICATIONNOTE1947ExactCircuitAnalysiswithMicrosoftExcelAbstract:Analyzingcircuitsnumericallydoesn'tmeanyouhavetobuyanexpensivesimulator.WiththecapabilitiesofMicrosoftExcel,commonlyavailableonengineers'computers,youcaneasilydomanycommoncircuitcalculations.Whilethiswon'treplaceyourfavoriteflavorofSPICE,itcanbeapowerfultooltosolveadedicatedproblemorgainintuition.SettingupaSimulationThefirstthingyouneedtoknowishowtouseExcel'sCOMPLEXfunction.Thecomplexfunctionfamilyallowsyoutoworkdirectlywiththecomplexnumbersth……

摘要：单位增益运放缓冲而不需要为偏置电阻，电容传感器和其他高阻抗信号源。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSKeywords:railtorailopamp,wideinputcommonmoderange,opampsAug27,2001APPLICATIONNOTE781AC-CoupledAmplifierRequiresNoDCBiasAbstract:Unitygainopampbufferscapacitivetransducerandotherhigh-impedancesignalsourceswithouttheneedforbiasresistors.Capacitivetransducersandotherhigh-impedancesignalsourcesusuallyrequireACcouplingandabufferamplifiertoconditionthesignal.Bufferstakemanyforms,butmostofthemcompromisesignalqualitythroughexternalresistorswhichprovideaDCpathfortheinputbiascurrent.Fortunately,recentimprovementsinopamptechnologyallowAC-coupledinputswithouttheneedforbiasresistors.Thesenewopampshaveinpu……

摘要：在一些电子系统，将有助于在输入电压直流偏置输出一个重要的错误。在高增益配置，这是特别真实。偏移调整电路，可添加到“空”出来的偏移电压，高增益的阶段，甚至与实际运放电路中重要的输入失调电压。Maxim>AppNotes>AmplifierandComparatorCircuitsDigitalPotentiometersKeywords:offsetadjust,offsetadjustment,opamp,nullingcircuits,nullingopamps,DCoffsetvoltage,Sep17,2001opampsAPPLICATIONNOTE803EPOTApplications:OffsetAdjustmentinOp-AmpCircuitsAbstract:Insomeelectronicsystems,aDCoffsetvoltageattheinputswillcontributeasignificanterrortotheoutput.Thisisespeciallytrueinhighgainconfigurations.Anoffsetadjustmentcircuitcanbeaddedto"null"outtheoffsetvoltage,makinghighgainstagespracticalevenwithsignificantinputoffsetvoltagesfoundinopampcircuits.ElectronicPotentiometers(EPOTS)offerdesignerstheopportunitytocontrolaresistanceviaadigitalinterfaceandcanbeusedinplaceofmechanical……

摘要：本应用笔记说明如何缓冲三缸背板驱动器输出的LCD驱动器MAX7231家庭增加电容的驱动能力等。这使得大屏幕液晶无鬼影和其他文物，由于背板波形失真驱动。Maxim>AppNotes>DISPLAYDRIVERSKeywords:LCDs,LCDdisplays,LCDdrivers,triplex,duplex,opamps,operationalamplifiers,opampsJul09,1998APPLICATIONNOTE415BufferingSchemeDrivesLargeLCDsAbstract:ThisapplicationnotesshowshowtobufferthetriplexbackplanedriveoutputsofaLCDdriversuchasMAX7231familytoincreasethecapacitivedrivecapability.ThisenablesalargeLCDtobedrivenwithoutghostingandotherartifactsduetobackplanewaveformdistortion.Toconservepins,manyLCDDriverstriplextheirdrivesignals―atechniquethatenablesACwaveformsontrhreecommonlinesandthreesegmentlinestoactivateanystandardcharacterofaseven-segmentdisplay.LargeLCDsof1"ormoreexhibitalargecapacitancebetweenthecommona……

摘要：通过钻研Sallen-Key滤波器的元件灵敏度更深入一点，我们发现在数学分析“甜蜜点”，使简单的，单一的运算放大器，过滤器，其性能的竞争对手，更复杂的过滤器，设计。在延长的Sallen-Key滤波器的效用，这种做法是有益的。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSAUDIOCIRCUITSFILTERCIRCUITS(ANALOG)Keywords:opampfilters,Sallen-Keyfilters,highpassfilter,opamps,singleopampMar21,2001APPLICATIONNOTE738MinimizingComponent-VariationSensitivityinSingleOpAmpFiltersAbstract:BydelvingalittlemoredeeplyintotheSallen-Keyfilter'scomponentsensitivities,wediscovera"sweetspot"inthemathematicalanalysisthatallowsthedesignofsimple,singleopampfilterswhoseperformancerivalsthatofmorecomplicatedfilters.ThisapproachhasbeenusefulinextendingtheutilityofSallen-Keyfilters.Dozensoffiltertopologieshavebeendevisedovertheyears,eachwithitsownadvantages.Yetengineersoftenrelyonasmallbutpopular……

摘要：MAX4450运算放大器在3杆，低通Sallen-Key滤波器配置提供了一个Butterworth响应-3dB带宽为5.25MHz。该电路可用于过滤复合（CVBS）或S-视频信号在标准清晰度数字电视（SDTV）应用的视频抗锯齿和重建。该电路设计驱动一个75Ω终接，共同在视频应用的总增益为1。Maxim>AppNotes>FILTERCIRCUITS(ANALOG)VIDEOCIRCUITSKeywords:3-pole,butterworth,activefilter,lowpassfilter,video,output,NTSC,PAL,reconstructionfiltering,Mar28,2002operationalamplifier,opamp,opampsAPPLICATIONNOTE1028SDTVReconstructionFilterwithAdjustableGroupDelayAbstract:TheMAX4450operationalamplifierconfiguredina3-pole,low-passSallen-KeyfilterprovidesaButterworthresponsewithabandwidthof-3dBat5.25MHz.Thiscircuitcanbeusedforvideoanti-aliasingandreconstructionfilteringforcomposite(CVBS)orS-VideosignalsinstandarddefinitiondigitalTV(SDTV)applications.Thecircuitisdesignedtodrivea75termination,commoninvideoapplications,withanoverallgainof1.Thisapplicationnotedescribesa5……

摘要：本应用简要介绍了如何控制模拟相移数字使用数字电位器和标准运算放大器（运放）的组合。它的目的是作为一个设计工程师需要实现电路的数字没有具体应用相转移例如。它提出了通用运算放大器相移的配置和如何使用数字电位器代替机械电位器或固定电阻加以实施。相移的计算公式中的应用笔记。ApplicationNote184Digitally-ControlledPhaseShiftUsingtheDS1669www.maxim-ic.comCONTROLLINGPHASESHIFTDIGITALLYAlteringthephaseresponseofasignalwithoutchangingitsamplitudecharacteristicsiscommonlyperformedusinganallpassfilter,asinFigure1.TheresponseofthiscircuitisgivenbyAsimplephaseshiftcircuitcanbeimplementedusinganallpassfilter.Figure1AsthesignalfrequencyvariesfromDCtoinfinity,thephaseshiftwillvaryfrom0to+180degrees.YoucanalsoseethatbyvaryingR1,thephaseshiftatagivenfrequ……