电子科学与技术外文翻译VIP免费

电子科学与技术外文翻译班级：学号：姓名：指导教师：时间：第2页共36页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第2页共36页Designofintegrated1.6GHz,2WtunedRFpoweramplifierAbstract：ThispaperdescribesthedesignofanintegratedtunedpoweramplifierspecifiedtooperateatInmarsatsatelliteuplinkfrequenciesfrom1626.5to1660.5MHz.ThebasictopologyoftheamplifierliesontheparalleltunedinverseclassEamplifierthatismodifiedbyplacingtheDC-blockingcapacitorintoanewpositionandbyadjustingthesizeofthecapacitortoimprovestabilitybelowthedesiredband.Further,thenewpositioningreduceslossesbetweendrainandload.Thehighcurrentsflowinginthecircuitmadeitnecessarytousewideinductorwidthandhigh-Qfingercapacitorsintheon-chipresonator.TheamplifierwasimplementedasaGalliumArsenide(GaAs)integratedcircuit(IC)thatdelivered2Wofoutputpowerwhilethedrainefficiencywasca.56%.Measurementsincludedsourceandloadpullstofurtherimprovetheperformanceoftheamplifierandtoinvestigatethestabilityatsmallinputdrivelevels.Keywords:InverseclassE•Poweramplifier.Self-oscillation•Biasnetwork1IntroductionTheusabilityoftraditionallinearamplifiersintoday’shighpowercommunicationssystemsislimitedduetotheirlowefficiency.ThisfacthasdriventheinterestofresearchtowardsmoreefficientamplifierssuchasclassE[1–3]andinverseclassE[4].Also,thedemandofhigheroutputpowermeanshigherpeakcurrentsandvoltagesinthedrainorcollectorcircuits.Thiscreateshighrequirementsforbothmaximumbreakdownvaluesofthetransistorandtothepassivecircuitryofthemonolithicmicrowaveintegratedcircuit(MMIC).TheeffectoflimitedconductivityandlimitedcapabilitytocopewithheatcanbeminimizedthroughcarefuldesignofMMIC.Further,emergingtransistortechnologiesseemtowithstandlargercurrentdensitiesandpeakvoltages[5],andtherefore,thechoiceoftechnologyisincreasinglyimportantwhendesigninghighpowerdevices.Theaimofthispaperistoshowexperiencesrelatedtothedesignofswitchinghighpowerradiofrequency(RF)amplifiers(PA)withintegratedoutputpulseshaping.InthesecondchaptertheintroductiontoclassEandinverseclassEoperationisrevisitedandthedifferencesbetweenthetwotopologiesarereviewed.Thethirdchapterdescribesthedesignoftheinputandoutputcircuitry,stabilizingcircuitsandprovidessometipstominimizetimingdifferencesattheinputofamulti-fingertransistor.Thefourthchaptershowsthefinalschematicandaphotooftheimplementedchip.Themeasuredperformanceisreportedinchapterfivebyusingbothbasicsingletonemeasurementequipmentandamodernloadpullsystemusingmulti-purposetuners(MPT).Thelastsectionprovidesasummaryofthearticleanddiscussionoftheissuesrelatedtostabilizingcircuits.2ClassEandinverseclassEamplifiersClassEandinverseclassEareregardedasswitchingamplifiers.Ideally,inbothofthemthetransistorisdriveneitheronoroffandthisswitchingoperationproducesa第3页共36页第2页共36页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第3页共36页seriesofvoltageandcurrentpulsestotheoutput.Thesepulsesarephaseshiftedandthereforedonotoverlapwitheachother.Idealnon-overlapcausesthetransistortooperatewithdrainefficiencyof100%.ClassicalclassEdrainwaveforms,normalizedtoDCvaluesofsupplycurrentandvoltage,areshowninFig.1.Thesolidlineisnormalizeddraincurrentwaveformandthedashedlineisnormalizeddrainvoltage.TherequirementforoptimaloperationinclassEiszerovoltageswitching(ZVS),wherethedrainvoltageanditsderivativegoestozerojustbeforethetransistorstartstoconduct.Inin...