资源描述：
《wideband lna using active inductor with multiple feed-forward noise reduction paths》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、IEEETRANSACTIONSONMICROWAVETHEORYANDTECHNIQUES,VOL.60,NO.4,APRIL20121069WidebandLNAUsingActiveInductorWithMultipleFeed-ForwardNoiseReductionPathsMohsenMoezzi,Member,IEEE,andM.SharifBakhtiarAbstract—Inthispaper,anarea-efficientLNAwithon-chipinputmatchingcircuitutilizinganactiveinducto
2、rispresented.Theactiveinductorisimplementedbasedonthegyratorstructureanditsnoiseisimprovedbyemployingafeed-forwardpath(FFP).Theoveralllow-noiseperformanceoftheLNAisachievedbycan-cellingtheinductornoisethroughanadditionalFFP.ItisshownthattheproposedLNAcircuitiscapableofachievinglow-n
3、oiseperformancewithwidebandtuningattheinputinasmalldiearea.A0.32-to1-GHzLNAhasbeendesignedandfabricatedinastandard0.18-mCMOStechnology.TheLNAoccupiesadieareaoflessthan0.1mm.Themeasuredresultsshownoisefigureof2.2–2.7dB(2.2–2.4dBfortheUHFband),returnlossofbetterthan10dB(13dBfortheUHFba
4、nd),andvoltagegainofhigherthan18dBovertheentirefrequencyband.TheLNAdraws8.5mAfroma1.8-Vsupply.IndexTerms—Activeinductor,LNA,noise,on-chipinputimpedancematching,wideband,tunability.I.INTRODUCTIONHEFIRSTsignalprocessingblockinthereceivingchainTisanLNA,andtheirnoisefigureandvoltagegainh
5、avethemostsignificantimpactontheachievablesensitivitylevelofthereceiver.LinearityandpowerconsumptionaretwootherFig.1.ConventionalLNAtopologies.(a)Parallelresistanceinputmatching.characteristicsofLNAsthatneedtobeconsideredintheirde-(b)Resistivefeedback.(c)Commongate.(d)Inductivedegene
6、ration.sign.Inradioreceivers,theLNA,asthefirstinputblock,istobeviderealinputimpedancematching.Wheretheformeremploysmatchedwiththeantenna’scharacteristicimpedance(generallynoisecancellationtechniqueandinthelatter,astheinputsignal50).Fig.1(a)–(d)showssomeoftheconventionalstructuresisam
7、plifiedproportionaltothequalityfactoroftheseriestank,usedforarealinputimpedance.InFig.1(a),bytheresonancethenoisefigureisimproved.Theneedforpassiveinductors,ofinductorwiththeamplifierinputcapacitanceatthedesiredhowever,isthemaindrawbackofthetwostructures.RFfrequency,remainsastheinputim
8、pedance.Inspiteofth
