标签: op-amp

   ApplyingtheOP06OpAmpAsaHighPrecisionComparator……

Variablegainamplifiersoftenuseamechanicalpotentiometertosetthegain.Anexampleisavolumecontroldial.However,whentheanalogsignalpathisdigitallycontrolled,adigitalpotentiometermightbeusedtocontrolgain.Thisarticlediscussestheuseofthedigitalpotentiometertoformdigitallycontrolledgainorfilterblocks.Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSDIGITALPOTENTIOMETERSKeywords:EPOTApplications:GainAdjustmentinOp-AmpCircuitsNov28,2001APPLICATIONNOTE864EPOTApplications:GainAdjustmentinOp-AmpCircuitsVariablegainamplifiersoftenuseamechanicalpotentiometertosetthegain.Anexampleisavolumecontroldial.However,whentheanalogsignalpathisdigitallycontrolled,adigitalpotentiometermightbeusedtocontrolgain.Thisarticlediscussestheuseofthedigitalpotentiometertoformdigitallycontrolledgainorfilterblocks.GeneralThroughoutthisdiscussionofdigitalpotentiometers,thetermEPOTisusedratherthandigitalpot,EEPOTorEPOT.ThetermEPOTdescribestheMaximseriesofvola……

电电压级别调整电压边距作为需要和，这种电路介绍运算放大器(MAX5481)和数字电位器来控制的反馈电压稳压器(MAX4245)。Maxim>Designsupport>Appnotes>AmplifierandComparatorCircuits>APP4564Maxim>Designsupport>Appnotes>BatteryManagement>APP4564Maxim>Designsupport>Appnotes>DigitalPotentiometers>APP4564Keywords:digitalpotentiometer,analog-voltagecontrol,op-ampbuffersJan20,2011APPLICATIONNOTE4564AddPreciseOutputAdjustmenttoLow-VoltageSuppliesAbstract:Totweaksupply-voltagelevelsandadjustvoltagemarginsasrequired,thiscircuitintroducesanopamp(MAX5481)anddigitalpotentiometer(MAX4245)tocontrolthefeedbackvoltagetothevoltageregulator.AsimilarversionofthisarticleappearedintheDecember20,2006issueo……

摘要：该电路显示了如何使用一个MAX406CMOS运算放大器非常高的输入阻抗非常高的输出阻抗缓冲pH值探头。所具备的优势，是一个标准的低成本电缆代替高成本的聚四氟乙烯介质同轴电缆的使用。该电路可连续数千小时的单节锂电池供电，电池的消耗是如此之低。驾驶一台液晶显示器显示的MAX130A集成ADC的使用。Maxim>AppNotes>AmplifierandComparatorCircuitsSensorsKeywords:op-amp,lowpower,buffer,pHprobe,integratingADC,analogtodigitalconverter,opamps,opampNov21,2000APPLICATIONNOTE34Low-PowerOp-AmpReducesCableCostsforpHProbeAbstract:Thecircuitshowshowtousetheveryhigh-inputimpedanceofaMAX406CMOSopamptobuffertheextremelyhigh-outputimpedanceofapHprobe.Theadvantagegainedistheuseofastandardlow-costcableinsteadofahigh-costTeflondielectriccoaxcable.Batterydrainissolowthatthecircuitcanbecontinuouslypoweredforthousandsofhoursonasinglelithiumcell.UseofaMAX130AintegratingADCisshownfordrivingaLCDdisplay.TheextremelyhighsourceimpedanceofapHprobe(1012Ω)oftenmandatest……

摘要：调整电源电压水平和调整所需的电压余量，这条赛道介绍运算放大器（MAX5481）和数字电位器（MAX4245）控制的反馈电压稳压器。Maxim>Designsupport>Appnotes>AmplifierandComparatorCircuits>APP4564Maxim>Designsupport>Appnotes>BatteryManagement>APP4564Maxim>Designsupport>Appnotes>DigitalPotentiometers>APP4564Keywords:digitalpotentiometer,analog-voltagecontrol,op-ampbuffersJan20,2011APPLICATIONNOTE4564AddPreciseOutputAdjustmenttoLow-VoltageSuppliesAbstract:Totweaksupply-voltagelevelsandadjustvoltagemarginsasrequired,thiscircuitintroducesanopamp(MAX5481)anddigitalpotentiometer(MAX4245)tocontrolthefeedbackvoltagetothevoltageregulator.AsimilarversionofthisarticleappearedintheDecember20,2006issueo……

可变增益放大器通常使用机械电位器来设置增益。一个例子是一个音量控制旋钮。然而，当模拟信号路径数字控制，数字电位器可能被用来控制增益。本文讨论了数字电位器的使用，形成数字控制增益或过滤块。Maxim>AppNotes>AMPLIFIERANDCOMPARATORCIRCUITSDIGITALPOTENTIOMETERSKeywords:EPOTApplications:GainAdjustmentinOp-AmpCircuitsNov28,2001APPLICATIONNOTE864EPOTApplications:GainAdjustmentinOp-AmpCircuitsVariablegainamplifiersoftenuseamechanicalpotentiometertosetthegain.Anexampleisavolumecontroldial.However,whentheanalogsignalpathisdigitallycontrolled,adigitalpotentiometermightbeusedtocontrolgain.Thisarticlediscussestheuseofthedigitalpotentiometertoformdigitallycontrolledgainorfilterblocks.GeneralThroughoutthisdiscussionofdigitalpotentiometers,thetermEPOTisusedratherthandigitalpot,EEPOTorEPOT.ThetermEPOTdescribestheMaximseriesofvola……

摘要：调整供电电压水平和调整电压利润率为需要，这种电路介绍运算放大器(MAX5481)和数字电位器（MAX4245）来控制电压调节器的反馈电压。Maxim>Designsupport>Appnotes>AmplifierandComparatorCircuits>APP4564Maxim>Designsupport>Appnotes>BatteryManagement>APP4564Maxim>Designsupport>Appnotes>DigitalPotentiometers>APP4564Keywords:digitalpotentiometer,analog-voltagecontrol,op-ampbuffersJan20,2011APPLICATIONNOTE4564AddPreciseOutputAdjustmenttoLow-VoltageSuppliesAbstract:Totweaksupply-voltagelevelsandadjustvoltagemarginsasrequired,thiscircuitintroducesanopamp(MAX5481)anddigitalpotentiometer(MAX4245)tocontrolthefeedbackvoltagetothevoltageregulator.AsimilarversionofthisarticleappearedintheDecember20,2006issueo……

DOp-AMP基本D类放大器设计与分析表面看来，复杂的D类放大器要想得到广泛的应用还需要解决一系列实际问题。本文作者为设计和实现分立元件的D类放大器提出了一些自己的看法，从理性和未来工程标准的角度，作者选择了一些器件并分析了仿真工具的缺点与局限性。[引言]功率放大器广泛地应用于多种现代设备当中。通常放大器能将低功率的输入信号转换放大为几瓦或更高功率的信号输出，理想情况下，输入信号波形应该没有任何改变地被复制放大。市场上共存着多种类型功率放大器，并按照晶体管的导通时间分类。A类放大器(ClassAAmplifier)A类放大器晶体管总是处于导通状态，也就是说没有信号输入时，晶体管也有输出功率，因此晶体管会变得很热，大部分功率都浪费在了产生热量上。尽管其效率很低(约20%)，但精度非常高。图1.1：A类放大器B类放大器(ClassBAmplifier)B类放大器采用两只晶体管，每只晶体管工作半个周期，一只晶体管工作于输入信号的正半周，另一只晶体管则工作于输入信号的负半周。因此在理论上两只晶体管不会在同一时间内导通。在没有输入的情况下，两只晶体管均处于截止状态且无输出功率，故而其效率高于A类放大器。不过由于晶体管都需要一定的开通时间，因此在两只管子交替过程中输出端存在一个短暂的无输出功率状态。这个无功率区域称为交越区(crossoverregion)，如图1.2所示，这就造成了相对较大的信号失真。所以B类放大器虽然具有很好的效率，但同时精度也不高。图1.2：B类放大器的交越区AB类放大器(ClassABAmplifier)AB类放大器与B类放大器非常相似，但由于AB类放大器增加了两个消除交越区的二极管，可使两只晶体管在同一时刻导通，因而其性能有所改善。AB类放大器的效率(约……

Op-AmpStabilitybaker’sbestBybonniebaker,,S14012010080VOLTAGEGAIN60(dB)4020020Justusea100resistorothereIwas,anewhireforaleading-edgeanalog-electronicscompany.Asitwasmyfirstjob,Iwaswide-eyedandexcited―confrontingnewproblemsleftandright.OneproblemIranintoinvolvedthestabilityofanamplifiercircuit.Inthisapplication,abuffer-amplifiercircuit,withacapacitiveload,sanglikeabird.BecauseIhadahugecommunityofexpertsaroundme,Iranaroundandaskedforadvice.Thewordsofwisdomthatcamedowntomewere,“Oh,puta100Vloadresistorbetweentheamplifieroutputandtheloadcapacitor.”WhenIaskedwhy,theengineersaid,“Justdoit.Trustme;itwillwork.”So,Ibuiltanewcircuitassuggested,and,loandbehold,thecirc……

实际ic设计应用中必须知道的op-amp知识,Introductiontodesignofop-amp……

单电源运放图集……