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some design aspects on rf cmos lnas and mixers

some design aspects on rf cmos lnas and mixers

ID：17577615

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页数：124页

时间：2018-09-03

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1、SomeDesignAspectsonRFCMOSLNAsandMixersAnna-KarinStenmanDepartmentofElectroscienceLundUniversityP.O.Box118,S-22100LUNDSWEDEN©2001Anna-KarinStenmanNo.26ISSN1402-8662PrintedinSwedenKFSABLund,December2001ToMarkusAbstractThisthesisdealwithtwopartsofaradioreceiver.Thelownoiseamplifier(LNA)andthemi

2、xer.AtunedRFfront-endamplifierinCMOSwithanoperatingfrequencyaround1.8to2GHzhasbeeninvestigated.Asymmetricdesignhasbeenusedtoimprovelinearitywithpre-servedpowerconsumption.Inthiscaseithasbeenaparallelconnectionofcomplementarydevices.Thesymmetricsolutionallowstheuseofinductorpairsintransformerc

3、onfigura-tiontoimprovethegainofthecircuit.Theinputimpedancehasbeencontrolledbyaninductiveseriesfeedbackofatransconduct-ance.Anextendedinvestigationhasbeenmadetodeterminetheeffectofthecapacitiveshuntfeedback,traditionallyignored,aswellastheeffectsofotherinternalparasitics.Sim-ulationresultssh

4、owsthatforarequiredinputresistanceandoperatingfrequencyamaxi-mumtransconductanceofthetransistorcanbefound.Anewapproximationoftheinputresistancewherefound,validforlowfrequenciesandforsmalltransconductances.Themostimportantpartoftheamplifieristhefirststage(theinverter)asitwillaffectbothinputimpe

5、danceandnoise.Analysisoftheoptimumnoisefigurebothwiththecapacitiveshuntfeedbackexcludedandincludedaremadetoshowthatitispossibletorepeatthecal-culationsinthesamemannerbothtimesandtherebybeingabletocomparetheresults.Themajorconclusionofthispaperisthattheshuntfeedbackcannotbeignoredandthatgoodd

6、esignmethodsthereforerequireamoreextendedanalysis.Imbalancesinquadraturedemodulators,basedonapassiveCMOSmixerwithcapacitiveload,hasbeenstudiedwithrespecttoprocessspread.Amathematicalmodelofthemixerhasbeenpresentedwhichexplainsthestatisticalspreadinthemixer.Themixertransferfunctionhasbeendivi

7、dedintoamultiplier,anamplifierandatime-variantfilter,wherethestatisticalspreadwillaffectthefilteringpartofthemix-er.Thefilteristime-invariantifthetimeconstantislargeenoughcomparedwiththelocalos-cillatorfrequency.Afirstapproximationofthemixerfilteristher

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