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1.25GbpsPECL输出限幅放大器.docx

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1.25GbpsPECL输出限幅放大器 Introduction: PECL(PositiveEmitterCoupledLogic)isatechnologycommonlyusedinhigh-speeddigitalcircuits.PECLcircuitsusedifferentialsignaling,whichprovidesexcellentsignalquality(lownoiseandjitter)andhigh-speedoperation.PECLoutputamplifiersarecommonlyusedincircuitswherehigh-speed,low-jittersignalsarerequired,suchasincommunicationssystems,signalprocessing,andtestandmeasurementapplications. Thepurposeofthispaperistoprovideanoverviewofthe1.25GbpsPECLoutputlimitingamplifier.ThispaperwillbeginwithabriefoverviewoftheoperatingprinciplesofPECL,followedbyanexplanationoftheneedforlimitingamplifiersinhigh-speedcircuits.Thepaperwillthendescribethedesignandoperationofatypical1.25GbpsPECLoutputlimitingamplifier,andconcludewithadiscussionoftheadvantagesanddisadvantagesofthistypeofcircuit. OperatingPrinciplesofPECL: PECLisadifferentialsignalingtechnologythatusesapositiveemitter-coupledtopology.InaPECLcircuit,theoutputvoltageswingisproportionaltothedifferencebetweenthevoltagesontwoinputlines.Thevoltageonthepositiveinputlineishigherthanthevoltageonthenegativeinputline,resultinginapositiveoutputvoltage.Conversely,ifthevoltageonthenegativeinputlineishigherthanthevoltageonthepositiveinputline,theoutputvoltagewillbenegative. Thisdifferentialsignalingapproachprovidesseveraladvantagesoversingle-endedsignalingcircuits,includingbettersignalquality,lowernoise,andhigherspeed.However,itdoesrequirethattheinputsignalsandoutputcircuitsbedifferentialaswell. NeedforLimitingAmplifiers: Inhigh-speedcircuits,itisoftennecessarytouselimitingamplifierstoimprovesignalquality.Limitingamplifiersareusedtoreducetheamplitudeofinputsignalsaboveacertainthreshold,effectively“clipping”thesignalandpreventingitfromdistortingasitpassesthroughsubsequentstagesinthecircuit. Limitingamplifierscanalsobeusedtoimprovethedynamicrangeofacircuit,byreducingtheamplitudeofverylargeinputsignalsthatmightotherwiseoverloaddownstreamcomponents. DesignandOperationofa1.25GbpsPECLOutputLimitingAmplifier: A1.25GbpsPECLoutputl