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1、手机设计开发流程（Mobilephonedesignanddevelopmentprocess）Thisarticleiscontributedbysuichao2003PdfdocumentsmayexperiencepoorbrowsingontheWAPside.ItisrecommendedthatyoufirstselectTXT,ordownloadthesourcefiletothelocalview.Mobilephonedesignanddevelopmentprocess,mobil
2、eRFprinciple,dualfrequencymobilephoneRFpartofthedesign,highfrequencyboardwiringrequirementsMobiledesignprocessAmobilephonereceivingpart1.TheprincipleofantennaswitchforFETdevices(duplexer)isadoubleknifeattheanalogswitch,oneknifetransceiversignalswitching,
3、anotherbladeisconnectedwiththetestport,itsworkingstatebytheswitchcontrolcircuitiscomposedofT3,T4,RX,ENandcontrolcommandTX-EN.WhenthecontrolsignalRX-ENishighwhentheantennaswitchisinthereceivingstate,thereceivedsignalintotheceramicbandpassfilterbyBPF3anten
4、naswitch,BPF2highfrequencyfilter,andthenthroughthecouplingcapacitorC103,C19,C109toPMB6253inlownoiseamplification,theamplifiedsignalisfedintoamixer,ahighfrequencyamplifierafterfilterand,fromthemainoscillatorreceivesthevibrationsignalRXVCOtogetherintothemi
5、xertocompletethetwosignalmixer,mixingtoproduceintermediatefrequencysignalbythecouplingcapacitorsC14,C87willremovetheclutterbyBPF1,andthensenttotheisolationamplifier.TheintermediatefrequencysignalinthereceivedsignaltransceiverwithinICquadraturedemodulatio
6、n,demodulationprocessinganalogbasebandsignal,theRXI/RXQreceivestheI/Qbasebandsignaloutputfrom8,9pinICrespectively.InU1,ICtransceiver,includingreceivingpartIntermediatefrequency,intermediatefrequencyamplification,mixing,PLL.13MHZmasterclock,masteroscillat
7、or,receivingintermediatefrequencyandtransmittingintermediatefrequency,etc.TwoThetransmittingpartbyCPUsentTX1TXQICU1,weresenttothetransceivertoproduceTXIFemissionfrequency,emissionfrequencyinputsignalTXIFINandTXVCOmixing,inU1phase,thentheoscillationfreque
8、ncy,preamplifiedfromU1,28feetoutput,thecouplingcapacitorC33poweramplifierCX77301to4feet,X3TXVCOIC4,putalotofpowercontrolerroroftheoutputvoltagetochangethepower,tochangethepowerleveloftransmittedsignal.WhenthecontrolsignalT
