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1、22IEEETRANSACTIONSONCIRCUITSANDSYSTEMSI:REGULARPAPERS,VOL.58,NO.1,JANUARY2011LinearizationTechniquesforCMOSLowNoiseAmpli?ers:ATutorialHengZhang,StudentMember,IEEE,andEdgarSánchez-Sinencio,LifeFellow,IEEE(InvitedPaper)Abstract—ThistutorialcataloguesandanalyzespreviouslydigitalTVtune
2、rshaspropelledinterestinbroadbandLNAde-reportedCMOSlownoiseampli?er(LNA)linearizationtech-sign.Radiosinthesameplatforminterferewitheachother,andniques.Thesetechniquescompriseeightcategories:a)feedback;multiplechannelsappliedsimultaneouslytoanLNAwithoutb)harmonictermination;c)optimu
3、mbiasing;d)feedforward;e)derivativesuperposition(DS);f)IM2injection;g)noise/distortion?lteringactasin-bandinterferences.Consequently,broadbandcancellation;andh)post-distortion.ThispaperalsoaddressesLNAsmustmaintainsuf?cientlinearityoverawidefrequencybroadband-LNA-linearizationissue
4、sforemergingrecon?gurablerange.Emphasisonhighlylineartransceivershassparkedrecentmultiband/multistandardandwidebandtransceivers.Further-interestinlinearizingLNAs[2].Eventhoughmostpreviouslymore,wehighlighttheimpactofCMOStechnologyscalingonlinearityandoutlinehowtodesignalinearLNAina
5、deepreportedtechniquestargetnarrowbandapplicationsandprin-submicrometerprocess.Finally,generaldesignguidelinesforcipallyimproveonlythethird-orderinterceptpoint(IIP3),wehigh-linearityLNAsareprovided.demonstratewhybroadbandsystemsrequirehighsecond-orderIndexTerms—Broadband,CMOStechno
6、logyscaling,derivativeinterceptpoint(IIP2)and1dBcompressionpointassuperposition,designguidelines,distortioncanceling,feedback,well.BecauseabroadbandLNAisexposedtoawidefrequencyfeedforward,harmonictermination,IIP2,IIP3,IM2injection,range,weinvestigatethedependenceofIIP2/IIP3ontwo-to
7、nelinearity,linearization,lownoiseampli?er(LNA),,multiband,(center)frequencyandfrequencyspacing.multistandard,noisecanceling,1dBcompressionpoint,optimumSinceLNAstypicallyhavelow-amplitude,highfrequencyin-biasing,post-distortion,tutorial.puts,theampli?eroperatesasaweaklynonlinearsys
8、temwithfewrelevantharmonic
