标签: impedance

ΔΣ模数转换器(ADC)具有高精度、高噪声抑制性能，是直接测量多种传感器的最佳选择。然而，输入采样电流能带来对源阻抗高或小带宽、微功耗信号调制电路的影响。LTC2484ΔΣ模数转换器通过平衡输入电流克服了这一难题，简化或消除了信号调理电路。advertisementEasyDriveADCsSimplifyMeasurementofHighImpedanceSensors……

全差分放大器常用以将单端信号转换为差分信号，这种转换需要有三点考虑：单端的源阻抗必须与差分放大器的单端阻抗匹配；放大器的输入必须限制于共模输入电压范围内；输入信号必须偏压在输出共模信号电压上。本文就单端至差分放大器中的常见的输入阻抗匹配和直流差分放大器的设计进行了探讨。Single-EndedtoDifferentialAmplierDesignTips……

本应用笔记说明使用多层PCB如何改善分立元件的功耗。它侧重于讲解使用较大的覆铜来提高应用的热性能的影响。AN11076Thermalbehaviorofsmall-signaldiscretesonmultilayerPCBsRev.1―11July2011ApplicationnoteDocumentinformationInfoContentKeywordsLowVCEsat,BISS,thermalresistance(Rth),thermalimpedance(Zth),totalpowerdissipation(Ptot)AbstractThisapplicationnoteillustrateshowtoimprovethepowerdissipationofdiscretecomponentsbyusingmultilayerPCBs.Itfocusesontheimpactofusinglargercopperareastoimprovethethermalbehaviorofapplications.NXPSemiconductorsAN11076……

8HintsForSuccessfulImpedanceMeasurement(AN346-4)……

Inhigh-speedtransmission-lineapplications,itisimportanttomatchtheoutputimpedanceofalinedrivertotheline.Whilethisisachievedusuallywitharesistor,anactiveimpedancesynthesishasadvantages.Thisapplicationnotedescribeshowtousepositivefeedbackaroundanopamptocreatethedesiredoutputimpedance.Equationsandcircuitexamplesaregivenforlow-noiseaudio,andvideoopampsdriving50-to600-ohmloads.……

Abstract:Analog-to-digitalconverter(ADC)datasheetsandapplicationtypicallyrecommenddrivingtheirinputswithalowsourceimpedance.ThisapplicationnoteexplainsthepossibleeffectssuchasincreasedgainerroranddistortionwhenusinghighimpedancetodriveanADCwithoutabuffer.Maxim>AppNotes>A/DandD/ACONVERSION/SAMPLINGCIRCUITSKeywords:ADC,analogtodigitalconverter,voltagedivider,distortion,gainerror,highimpedance,lowMar25,2003impedance,samplingcapacitor,timeconstant,a/dconvertersAPPLICATIONNOTE1948AnalysisofADCSystemDistortionCausedbySourceResistanceAbstract:Analog-to-digitalconverter(ADC)datasheetsandapplicationtypicallyrecommenddrivingtheirinputswithalowsourceimpedance.ThisapplicationnoteexplainsthepossibleeffectssuchasincreasedgainerroranddistortionwhenusinghighimpedancetodriveanADCwithoutabuffer.Analog-to-digitalconverter(ADC)usershavebeeninstructedbyendlessdatasheetsandapplicationnotestodrivetheirADCswithalowsourceimpedance.However,thesei……

Abstract:Humansareunusualcreaturesbecausesometimespartialknowledge,ego,andmisplacedconfidencearemoredangerousthannoknowledgeofasubject.Withelectronicdesign,misinterpretationsandmisunderstandingscanleadtocircuitsthatfailtofunctionasexpected.Toaninexperienceddesigner,somecircuitslookliketheyshouldwork.Meanwhile,theexperiencedengineercringes,wonderinghowsomeonecangetthemselvesinsuchafix.Thisapplicationnotepresentsthreecasestudiesthatillustratehowsomesimpleanalysisandaproperunderstandingofthelawsofphysicscaneducatedesignerstoavoidsimilarissuesinfuturedesigns.Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>A/DandD/AConversion/SamplingCircuits>APP4605Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>AmplifierandComparatorCircuits>APP4605Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>CircuitProtection>APP4605Keywords:noise,inexperienced,cleanpower,groundplanes,impedanceDC,levelmatching,powersupply,decouplingcapacitors,analogtodigitalconverters,ADC,DAC,signalprocessing,boardlayout,bounce,radioresonance,antenna,wavelength,partsmisuseMar09,2011APPLICATIONNOTE4605AvoidDesignMisinterpretationsthatPut……

Abstract:Transimpedanceamplifiers(TIAs)arewidelyusedtotranslatethecurrentoutputofsensorslikephotodiode-to-voltagesignals,sincemanycircuitsandinstrumentscanonlyacceptvoltageinput.AnoperationalamplifierwithafeedbackresistorfromoutputtotheinvertinginputisthemoststraightforwardimplementationofsuchaTIA.However,eventhissimpleTIAcircuitrequirescarefultrade-offsamongnoisegain,offsetvoltage,bandwidth,andstability.ClearlystabilityinaTIAisessentialforgood,reliableperformance.Thisapplicationnoteexplainstheempiricalcalculationsforassessingstabilityandthenshowshowtofine-tunetheselectionofthefeedbackphase-compensationcapacitor.Maxim>DesignSupport>TechnicalDocuments>Tutorials>AmplifierandComparatorCircuits>APP5129Maxim>DesignSupport>TechnicalDocuments>Tutorials>Sensors>APP5129Keywords:TIA,transimpedanceamplifier,transimpedanceamp,photodiode,medicalinstrumentation,industrialcontrol,piezo-sensorinterface,TIAstability,feedbackcapacitance,phasecompensation,bodeplotFeb03,2012TUTORIAL5129StabilizeYourTransimpedanceAmplifierBy:AkshayBhat,SeniorStrategicApplicationsEngineerFeb03,2012Abstract:Transimpedanceamplifiers(TIAs)arewidelyusedtotranslatethecurrentoutputofsensorslikephotodiode-to-voltagesignals,sincema……

Abstract:Railroadshavehadrail-to-railcomponentsforyearsthatwere,infact,nearlyrailtorail.Opampsemploythesamenearlyrail-to-railtradition.Thisapplicationnotediscussesrail-to-railopamps,andexplainswhysomeinputsandoutputscanbelessthan,nearly,orslightlymorethanthepowerrails.Maxim>AppNotes>AmplifierandComparatorCircuitsKeywords:railtorail,opamps,input,output,signalswings,beyondtherails,MOS,bi-polar,CMOS,Pinputpair,Ncommon-mode,supplySep28,2009bias,currentchanges,signmagnitude,crossover,distortion,NPN,PNP,impedance,matchphase,reversal,latchup,overdriveAPPLICATIONNOTE4428Rail-to-Rail:RailroadingandtheElectronicsofOpAmpsBy:BillLaumeister,StrategicApplicationsEngineerAbstract:Railroadshavehadrail-to-railcomponentsforyearsthatwere,infact,nearlyrailtorail.Opampsemploythesamenearlyrail-to-railtradition.Thisapplicationnotediscussesrail-to-railopamps,andexplainswhysomeinputsandoutputscanbelessthan,nearly,orslightlymorethanthepowerrails.IntroductionF……

摘要：铁路已经有多年了，其实，近轨到轨的轨到轨组件。运算放大器采用相同的近轨到轨的传统。本应用笔记讨论了轨至轨运算放大器，并解释了为什么一些输入和输出可以是小于，接近或略高于电源轨。Maxim>AppNotes>AmplifierandComparatorCircuitsKeywords:railtorail,opamps,input,output,signalswings,beyondtherails,MOS,bi-polar,CMOS,Pinputpair,Ncommon-mode,supplySep28,2009bias,currentchanges,signmagnitude,crossover,distortion,NPN,PNP,impedance,matchphase,reversal,latchup,overdriveAPPLICATIONNOTE4428Rail-to-Rail:RailroadingandtheElectronicsofOpAmpsBy:BillLaumeister,StrategicApplicationsEngineerAbstract:Railroadshavehadrail-to-railcomponentsforyearsthatwere,infact,nearlyrailtorail.Opampsemploythesamenearlyrail-to-railtradition.Thisapplicationnotediscussesrail-to-railopamps,andexplainswhysomeinputsandoutputscanbelessthan,nearly,orslightlymorethanthepowerrails.IntroductionF……

摘要：铁路轨到轨组件多年了，事实上，近轻轨铁路。运算放大器雇用近轨轨一样的传统。本应用指南讨论轨到轨运算放大器，并解释了为什么一些输入和输出可以是少于、近，或略超过电源导轨。Maxim>AppNotes>AmplifierandComparatorCircuitsKeywords:railtorail,opamps,input,output,signalswings,beyondtherails,MOS,bi-polar,CMOS,Pinputpair,Ncommon-mode,supplySep28,2009bias,currentchanges,signmagnitude,crossover,distortion,NPN,PNP,impedance,matchphase,reversal,latchup,overdriveAPPLICATIONNOTE4428Rail-to-Rail:RailroadingandtheElectronicsofOpAmpsBy:BillLaumeister,StrategicApplicationsEngineerAbstract:Railroadshavehadrail-to-railcomponentsforyearsthatwere,infact,nearlyrailtorail.Opampsemploythesamenearlyrail-to-railtradition.Thisapplicationnotediscussesrail-to-railopamps,andexplainswhysomeinputsandoutputscanbelessthan,nearly,orslightlymorethanthepowerrails.IntroductionF……

要：人类是不寻常的生物，因为有时局部知识、自我和放错了位置的信心都没有一个主题的知识比更危险。电子设计，曲解和误解可能会导致无法按预期工作的电路。到一个没有经验的设计师，部分电路看起来他们应该工作。卑躬与此同时，经验丰富的工程师屈膝，不知道怎么有人让自己修理了。此应用程序注礼物三个案例研究，说明了一些简单的分析和正确认识的物理定律如何教育设计师以避免类似问题在未来设计。Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>A/DandD/AConversion/SamplingCircuits>APP4605Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>AmplifierandComparatorCircuits>APP4605Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>CircuitProtection>APP4605Keywords:noise,inexperienced,cleanpower,groundplanes,impedanceDC,levelmatching,powersupply,decouplingcapacitors,analogtodigitalconverters,ADC,DAC,signalprocessing,boardlayout,bounce,radioresonance,antenna,wavelength,partsmisuseMar09,2011APPLICATIONNOTE4605AvoidDesignMisinterpretationsthatPut……

摘要：互阻放大器（TIA）被广泛用于转换电流输出的传感器，如光电二极管的电压信号，因为许多电路和仪器只能接受电压输入。与一个反馈电阻从输出到反相输入的运算放大器是最简单的实现这样一个TIA。然而，即使这样简单的TIA电路之间的噪声增益，失调电压，带宽和稳定性需要仔细权衡。显然，在TIA的稳定是必不可少的好，性能可靠。本应用笔记介绍了评估稳定的经验计算，然后显示如何微调反馈相位补偿电容的选择。Maxim>DesignSupport>TechnicalDocuments>Tutorials>AmplifierandComparatorCircuits>APP5129Maxim>DesignSupport>TechnicalDocuments>Tutorials>Sensors>APP5129Keywords:TIA,transimpedanceamplifier,transimpedanceamp,photodiode,medicalinstrumentation,industrialcontrol,piezo-sensorinterface,TIAstability,feedbackcapacitance,phasecompensation,bodeplotFeb03,2012TUTORIAL5129StabilizeYourTransimpedanceAmplifierBy:AkshayBhat,SeniorStrategicApplicationsEngineerFeb03,2012Abstract:Transimpedanceamplifiers(TIAs)arewidelyusedtotranslatethecurrentoutputofsensorslikephotodiode-to-voltagesignals,sincema……

摘要：低输入电容运算放大器的应用，如烟雾探测器，光电二极管放大器，医疗仪器，工业控制系统，压电式传感器接口。最大限度地降低输入电容也可以增加一杆在反馈路径的频率，直到它有一个电路的影响可以忽略。测量运算放大器的输入电容是不平凡的，尤其是如果该值是只有几个皮法。如此低的价值也提出在生产过程中测试的筛选运算放大器的困难。这一设计思想，介绍了如何准确地确定任何运算放大器的输入电容。Maxim>Designsupport>Appnotes>AmplifierandComparatorCircuits>APP5086Keywords:opamp,operationalamp,inputcapacitance,transimpedanceamp,photodiodetransimpedanceamp,medicalinstrumentation,industrialcontrol,piezo-sensorinterface,bodeplot,RCfilter,opampinputimpedance,opampstability,photodiodecapacitanceJul01,2011APPLICATIONNOTE5086MeasuretheInputCapacitanceofanOpAmpBy:AkshayBhat,SeniorStrategicApplicationsEngineerAbstract:Opampswithlowinputcapacitancearerequiredinapplicationssuchassmokedetectors,photodiodetransimpedanceamplifiers,medicalinstrumentation,industrialcontrolsystems,andth……

摘要：常用的音频系统使用模拟开关切换低级别的输入或调整音频过滤器的特点。选择合适的模拟开关，可以帮助优化系统的总谐波失真（THD），在设计师的成本预算。Maxim>AppNotes>AUDIOCIRCUITSSWITCHESANDMULTIPLEXERSKeywords:analogswitches,THD,audiofilter,on-resistancedistortion,flatness,linearityimpedanceFeb23,2001APPLICATIONNOTE730MinimizingTotalHarmonicDistortionContributedbyAnalogSwitchesinAudioSystemsAbstract:Analogswitchesarecommonlyusedinaudiosystemstoswitchlow-levelinputsoradjustaudiofiltercharacteristics.Selectingtheproperanalogswitchcanhelpoptimizethetotalharmonicdistortion(THD)ofasystemwithinthedesigner'scostbudget.Analogswitchesarecommonlyusedinaudiosystemstoswitchlow-levelinputsoradjustaudiofiltercharacteristics.Selectingtheproperanalogswitchcanhelpoptimizethetotalharmonicdistortion(THD)ofasystemwithinthedesigner's……

【应用笔记】在StratixIi器件中使用校正的片上串行终端(UsingCalibratedOn-ChipSeriesTerminationinStratixIIDevices)片上串行终端(RsOCT)由于最佳的的阻抗匹配，提升了信号完整性和I/O性能。片上串行终端消除了外部串行电阻的需要，简化了PCB设计。On-chipseriestermination(RSOCT)improvessignalintegrityandI/Operformanceduetooptimizedimpedancematching.On-chipseriesterminationeliminatestheneedforexternalseriesterminationresistorsandsimplifiesthedesignofaprintedcircuitboard(PCB).UsingCalibratedOn-ChipSeriesTerminationinStratixIIDevicesApril2005,ver.1.0ApplicationNote384IntroductionOn-chipseriestermination(RSOCT)improvessignalintegrityandI/Operformanceduetooptimizedimpedancematching.On-chipseriesterminationeliminatestheneedforexternalseriesterminationresistorsandsimplifiesthedesignofaprintedcircuitboard(PCB).RSOCTisimplementedthroughoutputdriverim……

摘要：人类是不寻常的动物，因为有时是局部的知识，自我，和错位的信心比任何一个主题的知识更危险。随着电子设计，曲解和误解可能会导致电路无法如预期般运作。一个没有经验的设计师，一些电路看起来像他们应该工作。同时，经验丰富的的工程师cringes，不知道怎么有人可以得到自己在这样的修复。本应用笔记介绍了三个案例研究，说明一些简单的分析和物理规律的正确认识如何能教育的设计师，以避免类似的问题在未来的设计。Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>A/DandD/AConversion/SamplingCircuits>APP4605Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>AmplifierandComparatorCircuits>APP4605Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>CircuitProtection>APP4605Keywords:noise,inexperienced,cleanpower,groundplanes,impedanceDC,levelmatching,powersupply,decouplingcapacitors,analogtodigitalconverters,ADC,DAC,signalprocessing,boardlayout,bounce,radioresonance,antenna,wavelength,partsmisuseMar09,2011APPLICATIONNOTE4605AvoidDesignMisinterpretationsthatPut……

摘要：人类是不寻常的动物，因为有时是局部的知识，自我，和错位的信心比任何一个主题的知识更危险。随着电子设计，曲解和误解可能会导致电路无法如预期般运作。一个没有经验的设计师，一些电路看起来像他们应该工作。同时，经验丰富的的工程师cringes，不知道怎么有人可以得到自己在这样的修复。本应用笔记介绍了三个案例研究，说明一些简单的分析和物理规律的正确认识如何能教育的设计师，以避免类似的问题在未来的设计。Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>A/DandD/AConversion/SamplingCircuits>APP4605Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>AmplifierandComparatorCircuits>APP4605Maxim>DesignSupport>TechnicalDocuments>ApplicationNotes>CircuitProtection>APP4605Keywords:noise,inexperienced,cleanpower,groundplanes,impedanceDC,levelmatching,powersupply,decouplingcapacitors,analogtodigitalconverters,ADC,DAC,signalprocessing,boardlayout,bounce,radioresonance,antenna,wavelength,partsmisuseMar09,2011APPLICATIONNOTE4605AvoidDesignMisinterpretationsthatPut……

CalculatingPCBTrackImpedanceFormulasCalculationofPCBTrackImpedancebyAndrewJBurkhardt,ChristopherSGreggandJAlanStaniforthTheuseofhigh-speedcircuitsrequiresPCBtrackstobedesignedwithcontrolled(characteristic,odd-mode,ordifferential)impedances.Wadell[1]isoneofthemostcomprehensivesourcesofequationsforevaluatingtheseimpedances.Thissourceincludesmanyconfigurationsincludingstripline,surfacemicrostripandtheircoplanarvariants.TheIPCpublication,IPC-2141[2],isanothersourceofequations,buthasasmallerrangeofconfigurations,similartothosepresentedinIPC-D-317A.However,forsomeconfigurationstherearedifferencesbetweentheequationsgiveninthesepublications.TheauthorsbelievethatitisnowopportunetoexaminetheoriginoftheequationsandtoFigu……

李缉熙讲座之Impedancematching,Impedancematching……