SAWless零中频接收机之考虑与剖析

1、 Whydoweneedexternalfilte # #nmostwirelessradiosahatcanbesignificantlysransmitsmaximfphone1andphone2areeceivercircuitwillsufferweakdesiredsignalcanbearonger1.Forexample,aswer,i.e.33dBm.Letsassoth50%(i.e.3dBlos).Confrom0dBminterferer. # We=50%n=50%GSMTx=33dBmBlocker=0dBm ckersandrasticaldegradetherec

2、eiverpeitsgainandhenceincreasingitsnoisere,asIdBCPidealblockerlevelactualblockerlevelIdealsmall-signalactualsmall-signalgain20logAin4k20logAoutGaindBndBnbe,strongertheer,more11111Blockerat1,88GHzDesiredat1,96GHz inenoise # #161.82222AFrequency,GHz # #ngeneral,lessthekeSKY74092-1tedbythe0in,higherthe

3、noisefiexample,itockermentioneda # #nZero-IF(ZIF)iteereceiver,ndDCetisonenonlineareffeesreceiver,theDCetdueeceive #BlockerSelfMixing=Blocker-Blocker naddition,iftheblockerhashighphasenoise,verallnoisefllevel2.JammerSignalenRFDCLOLOSignalwithPhasenoiseenJammerJammerwithLOPhasenoiseASignal #nFrequency

4、-DivisionDuplexing(FDD)eakage2nicationenceDuplexer #ilarly,eventhoughblockerasenoise,i.e.adjacentchanneeoverallnoisefloorlevel8senio(ACRFICTXLeakageLargeBlockerRXDesiredDuplexeroto # fcourse,ifRxLOhasfinitephasenoiseteciproalmixingatthemixeroutwexleakagealsocausesgainreductionandeceiverisninearenCth

5、eblockerisneasignal,whichandation(IM3)andcross-modulation(XMD)inearity.Both3andXMDareneasigegradation # esides,iftheerisneignalinspe,whichiikeDCet,andwiSignal0Hz0HzTxblockerSignalSignalIMD2-JJJFTxblocker ,theblockeeakageCriterionffectthentionee,ealreadykneeffeertheTxleeaner,erthenmp一NHstTEUGehnB-u.即

6、阱-DN莎BE虫098765432101WCDMATmandWCDMARANDIIWCDMftTxand-160MHzIL0BlockerPowerdBm-10Criterion ecially,ifthemobileationiseedgeisongblockerpresence,duetotheowerweriskeptclosetoismaximumlevelmaintAndhemobilestationrecceivesextremelyweaksiTowerWeakRxCDMATower；7StrongTxCriterion incethedesireignaliseenoisefi

7、gureemelyweak,theLNachieveacceptableMAX2645NoiseFigurevs.Frequency(HP-fl?n.丄SON,higherthegain,worsethelinearityandwoertheTxleakageandblocker,higherthentissay,thisisthese.Criterion Henceinmoandards,definedvariouckeker.orinstance,insensitivitybeacandoseasonly80ereceivermustsatisffrequenciesandlevels,e

8、GSMstandard,aesaniedbyanout-of-banotheedgeofheCriterion #Criterion #Out-of-bandFIGURE$BackingProfitforVCS190ft.DesiredMeeinieineeninibeenCriterion desiredsignalNqyuistFilter,asshownbelow,basebandLow-pastionprsetothedownconBlockerIMDproductDCOffsetduetononlinearity,self-mixEng,andIMD2BBLPFDCCriterion

9、 #Criterion neBBAmpdistortioneessary,especiallyinnicationsysteCriterionntermsofon-chipfiltering,apassivemixerdrivonuilt-inhigh-Qband-pailter(Bnstion,21.Asmentionedearlier,teblerreventrationheinptdeuil-inhigh-QBPFisplacedinfron.Thimuatedgainowhenthebuilt-inBihePFishereisl-ofelnexternaWfilter6.Criteri

10、onCriterion8P.EEOCriterion Criterion #eionelee,reesih3025201510mp)ajn6izacnoNCriterion #Criterion #1k10k100k1M10MFrequency(Hz)Criterion #Criterion ernoiseisevennthenconverteCriterion Criterion #enelineeceivent-enndiseisesseninhiineenenceineenennell-inns,eenCriterion highLOpowerisneenoisefigure25.eve

11、rtheless,inordeonversionlossnbelow,higheCriterion #Criterion #2U16Id3-20RFlQCKERERBm)PLO=-3伽-FLO-*3(JBrn-汕0=+6cBmFiF=-gOOMHE8LQLA=00MHzCriterion #Criterion ngLOpowestaticDClevelaggravdrainrent,evenwithnicheexcitaexcitationandlargeblexistinivemixer.TXleeinpointshiftexacerbapotentiayincreaseDCnon-idea

12、llayouts18.yresinsignificant2.Llegecausetingsensitivity.Besides,eromean,noieappearion.Ao,ifetker,iteemsossiblehenaerrgeRFplexem,hereisingtheemher.ffsets,uetimbalancedCriterion eendemonstteincreasingACchanneitheercangenerteconDCoffset.ThisisaignificantconcernforW-leceiverarchitees,with50%duty-eLmixer

13、devicesareeitheronoff.Howeverwithnocausehetotalnoisereferreheouincrease.ever,cored50%duty-cyle,lowerwit25%duty-ccleLO.Andthhe1/fnoisewoveranoiseaftertionfor%ty-noisealificationasebandandlargerignvefsresulinimpred1/fnoisendDCithlargekingsignalsasweCriterion Criterion 47esides,in50.550Gaiino1/fnoise5也

14、mpseo49548547.0.20.30.4DutyCyulE00.6(-).eneninCriterion us,inaZIFreceiverwherethepassiveIandQmixerduty-cycleLO,resultinginhigherreceivergainrelativetoaimplementation,a3dBimprovementingainbyusing25%dutabove18,.Besides,asmentionedearlier,I/Qimbalanceresuaggravatingsensitivity.Butwithe25%duty-cyclemixe

15、rdoblemiseliminated17,21.ntheotherhand,asmentioalmosthasisworstvaluefthebestIIP3insomecasadvantageofusingapassivemixerwith25%duty-cycleis*thaincreasedIMDdistortionwhenalargeblockerispresentatthereceiverP3peformanceisimprovedsignificantlcompared50%duty-cycle.hatistosay,withthe25intoapassivemixer,whic

16、hresultsin3dBadditionalgain;figure,IMDdistortionand1/fnoise.Ofcourse,withIIP2improvemore18Consequently,ifpassiveIandmixerareclockedwitha25erearesomeadvantages,assummariedbelowConstructabuil-inhigh-QBPFHighlinearityHighimmunitytostrongblockeLow1/fnoiseandDCoffsethigherreceivergainrelativetoa50%duty-c

17、ycle,3dBimLessimage(undesiredsideband)issueCriterion Criterion #exer,initionelectinighiritical.nbelow,weneeenhanceisolationfrx”RXANTJ丄/AggressorVictimCriterion #e,thereiromRxport.romthetwoCriterion #Criterion 5650!8mRx101Rx2TX3BottomViewANT2.3nM(ideal)l2nH(iideal)xX-Criterion xandANTe,andmakeetterma

18、keebeawayCriterion #Criterion #ANT(Tx/Rx)ANT(Tx/Rx)7Criterion #:CouplejCTXRXen:(j|DuplexerCouTXenCriterion #Criterion #Criterion Criterion #Consequently,this.nbelow,theectPCCriterion ReferenceCriterion #Criterion #nmC-BandSAW-LessReceiveCriterion #Criterion #CDMAZero-IFReceiverConsideration,Slidesha

19、reSensitivitrselectivity-HwdoeseLNAimpdeshareSystem(Bdlevel)oiseFigureanalysisanntheDirectConversionReceiver-ATutoriBlockerFilteringTechniqueforSAW-LessCriterion #Criterion #ABlocker-Tolerant,NWirelessApplicationsMulti-ModeMulti-BandALM-110function,AV0Performanceofspead1WirelessTechnologies2AnIntegratedGSM/D3InterferenceMitigationfoise-CancellingReceiverSuiRFTransceiversfWireoiseamplifierwithariabspectrstem:Circuit,Systems,andDECTReceier:Desig