差分CMOS低噪声放大器的设计

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1、西南交通大学硕士学位论文差分CMOS低噪声放大器的设计姓名：陈璇申请学位级别：硕士专业：通信与信息系统指导教师：冯全源20080601西南交通大学硕士研究生学位论文第1I页AbstractDuetotherapiddevelopmentinscienceandtechnology,thewirelesscommunicationsystemhaspotentlyshortenedtheconnectivityamongpeople．ThedramaticprogressofCMOSprocesstechnologyhas

2、graduallyevidenceditsapplicationsinRFfront—endcircuits．CMOSprocesspossessestheadvantageoflowcostandhighlyintegration．AsthemainpartoftheRFfront—endreceiver，thefunctionofthelownoiseamplifier(LNA)isamplifyingthefaintsignalwhichinceptedfromairbytheantenna．Itcanreduce

3、thenoisejamming，SOastodemodulaterightinformationforthesystem．ThenoiseperformanceoftheLNAwillaffecttheperformanceofthewholesystemdirectly,andthendecidingthesensitivityanddynamicworkingscopeofthereceiver．Inrecentyears，therapiddevelopmentofwirelessradiosystemlcadsto

4、anincreasingdemandoflOWnoise．10wpower,lowlost，highperformanceandhighintegration．Inordertosatisfytherequirementwedesignedalownoiseamplifier(LNA)for2．5GHzRFfront．endreceiver．Basedon0。18／anCMOSprocessandBSIM3v3modelandadoptedaTow．InputandTow—Outputstructure．a2．5GHzC

5、MOSdifferentiallownoiseamplifierisdeignedforthewirelessreceiverapplication。Thisthesisfirstlyintroducestheprinciple，configurationandadvantageofthedifferentialLNA，andthenanalyzesthecurrent-reusetechnologyanddisadvantagesofthetraditionalstructure，andanimprovedcascod

6、eLNAispresented，whichadoptsacombinationofsource·degeneratedNMOSinvertertoimprovegainandnoisefigure．MeanwhileweproposedaparallelLCnetworkinsteadofthelargevaluegateinductorLg．Fromthedesignstandpoint，iteconomizesthepowerdissipation，reducesthenoisefigureandmakestheop

7、timizationandintegrationofthestageeasy．Fromtheaspectofbiascircuit，noiseoptimization，lineargain，impedancematch，andthedesignmethodologyforLNAisanalyzed，theeffectofthesourceinductive，inputmatchingcapacitanceandthecomponentmodeloftransistorsonLNAiSalsodiscussed．Resul

8、tsbyADSshowthatgainofabove15．053dB，1．41dBNF’theinputreflectionSlliS一50．68dB，thereversetransmittedcoefficientS12of-20．926dBandP1dBof·1．39dBmwithgoodstabilityare