《RF校准软件设计》PPT课件.ppt

手机射频校准,什么是射频校准？,TheprocessofobtainingRFparametricdatatobeusedbythephoneforthepurposeofcompensatingfornon-lineardevices,frequencyvariations,andtemperaturevariationsOutputfromthecalibrationprocessisstoredinnon-volatile(NV)memoryDMSSusesRFNVitemsduringnormaloperationtoensuresystemperformanceismet.,射频校准的意义?(1),SubscriberunitshavedifferingRFcharacteristics.-Somecharacteristicsvaryfromoneunittothenext-Othercharacteristicsvaryfromonedesigntothenext,射频校准的意义?(2),ThesubscriberunitmustestimatetheRxpowerproperlytomaximizesignaltonoiseratiosandtoprovideabasisforTxpoweroutput.ThesubscriberunitmusttransmitatcorrectTxpowerleveloveritslargedynamicrange.,射频校准的意义?(3),TheMSMdeviceandsystemsoftwarecombinationmust“know”theRFcharacteristicsoftheparticularunit.ThisinformationisknownasRFcalibrationdata.FailuretocompensatefordifferingRFcharacteristicsmaycausetheunittofailminimumperformancespecifications.,射频校准的意义?(4),CalibrationConsideration:-SomeNVItemswillbestaticperphonedesignEx:NV_CDMA_ENC_BTF-OtherNVitemswillvaryfromonephonetothenextandneedtobecalibratedEx:NV_CDMA_TX_LIN_MASTER_1,射频校准的信号流图,射频校准工位搭建,NV项,Calibrationcompensatesfornonlinearcharacteristics,andtemperatureandfrequencyvariationsintheperformanceoftheTxandRxpathcomponentsinasubscriberunitOutputfromthecalibrationprocessarestoredinnonvolatile(NV)memoryitemsinAMSSsoftwareDMSSsoftwareloadscalibrationvaluesintoMSMregistersorusesthemforsoftwareprocessingduringnormalDMSSoperationNVitemscanbeaccessedusingrawDIAGcommandsorusingDIAG-basedtools,suchastheQPSTRFCalibrationToolSomeNVitemswillbestaticperthehardwaredesignOtherNVitemswillvaryfromoneunittothenextSomeelementswithinanNVitemcanbeextrapolated,NV项类型,StaticRFNVItems:Valueisdeterminedbydesignanddoesnotchangeforthesamedesign.Ex:NV_CDMA_NONBYPASS_TIMER_ICalculatedRFNVItems:Valueiscalculatedbasedonotherparametersofthedesignconfigurationandvaluedoesnotchangeforagivenconfiguration.Ex:NV_CDMA_LNA_RANGE_RISE_IMeasuredRFNVItems:ValueisdefinedbyRFcalibrationprocessandeachdevicemayhaveadifferentvalue.Ex:NV_CDMA_TX_LIN_MASTER_0_I,FTM介绍,FTMisexpandable,allowingcustomerstobuildontothefunctionsformanufacturer-specifictestingFTMisnowapartofQPSTExtensivedocumentationisavailableforcustomerreference80-V4690-25Rev.BMSM6250RFNVItemsCL-93-V5368-1Rev.CFactoryTestModeWCDMACommandsCL93-V5370-1Rev.FFactoryTestModeGSMCommands80-V5359-1Rev.EFTMOverview,运行FTM,ReleasedDMSScanbemadetobootupinoneoftwooperatingmodesNormal“DMSS”modewithregularcellularoperationFTMmodewithnocellularsystemdeterminationandcall-processingBydefault,DMSSwillpowerupinnormalmodeAMSSsoftwareisalsocapableofswitchingmodesatrun-time(noresetrequired)ToswitchfromonlinetoFTM,senda“ModeFTM”commandtothephone.ToswitchfromFTMtoonline,senda“ModeOnline”command.ToactivateFTM:SendOff_linecommandtotargetSendDiagCommandNV_WRITEandsetNVitemNV_FTM_Ito1.ResettargetbysendingaMODE_RESETcommand.TargetwillbootupinFTMmode.TargetLCDscreenshoulddisplay“FactoryTestMode”AtthispointtheunitisreadytoreceiveFTMcommands,FTM命令介绍（1）,BoolSetPDM(pdm_id_typetype)ThiscommandsetsthevalueofaPDMoutput,basedonPDM_IDsuchasTx_Agc_PdmorRx_Agc_PdmByteGetADC(adc_id_typetype,word*data=NULL)Thiscommandreturnsthevalueofthespecifiedanalogto-digitalconverter(ADC)channels.WordGetCAGC_RX_AGC()Thiscommandreturnsthe10-bit2scomplementoutputoftheRXAGCloopBoolGetSynthLockState()ThiscommandreturnsthestateoftheRFsynthesizers.,FTM命令介绍（2）,BoolSetCDMAWaveCW(boolon_off)ThiscommandsetsthemodulationON/OFFfortheuplinkwaveform.Passin“true”forCWwaveformand“false”forWCDMAuplinkwaveformBoolSetChannel(wordchannel)ThiscommandsetstheuplinkanddownlinkchannelBoolSetLNAOffset(byteindex,intvalue)ThiscommandsetstheLNAoffsetregisterBoolSetLNARange(lna_range_typerange)ThiscommandsetstheLNArangestatemachinetothespecifiedstate,FTM命令介绍（3）,BoolSetMode(mode_id_typemode)ThisfunctionmakesaselectionbetweenGSMandWCDMAoperatingmodes.ItinitializesallofthenecessaryregisterstoplacethephoneintherequestedmodeBoolSetPARange(pa_range_typerange)ThiscommandsetsthePArangestatemachinetothespecifiedstateBoolSetTxOFF()ThiscommandturnsoffthephonestransmitchainincludingthepoweramplifierandtheMSMTxclocksBoolSetTxON()ThiscommandturnsonthephonestransmitchainincludingthepoweramplifierandtheMSMTxclock,FTM命令介绍（4）,WordGetCDMAIM2(byte*Idac,byte*Qdac,byte*Trans)ThiscommandreturnstheoptimumIM2valueforthecurrentmodeandchannelofthemobile.Rxsignalinputarerequiredtobesetbeforeissuingthiscommandorresultswillnotbeaccurate.Theresultingwordcontainstwovalues:ThemostsignificantbytecontainstheIvalueThemiddlebytecontainstheQvalueTheleastsignificantbytecontainsthetransconductancevalueBoolSetDVGAOffset(wordoffset)ThisfunctionsetstheDVGA(DigitalVGA)offsetregisterWordGetDVGAOffset(void)ThisfunctiongetstheDVGAoffsetregistervalue,AutomaticGainControl(AGC),ThephonedoesnotusedBanddBmtomanagepower.Intheembeddedsoftware,allpowerisdefinedintermsofAGCunitsAGCunitsAGCisstoredas10-bitnumberRangeis210,1024totalunitsdB/AGC=DynamicRange(dB)/1024ForDynamicRange=85.3dBThereare12AGCunitsperdBBothRXandTXuseAGCunitsforallpowercalculationsE.g.RxmustmeasurepoweranddetermineRXAGC.E.g.TxAGCunitsareusedtocalculatetransmitpower(e.g.maxpowerandaccessprobestepsizes).,RXAGC和dBm的转换,GivenMinRSSI=-106dBmAGC/dBconversion=12AGC/1dBdB/AGCconversion=0.08dB/1AGC,TXAGC和dBm的转换,GivenMinMSMTxlinearizerpower=-57.3dBmAGC/dBconversion=12AGC/1dBdB/AGCconversion=0.08dB/1AGC,HDET,PhonelookingupHDETtogetpower:Upper25%oftheTxdynamicisusedtoobtainpowervs.HDETcurve.HDETdynamicrange=0.25*85.3=21.33HDETdynamicrangeisdividedinto16segments.HDETmaxtablepower=28.0dBmHDETmintablepower=6.67dBmHDEToffsetandspanOffsetandspandefinetherangeinwhichthepower-limitingalgorithmisactiveOffset:LowestHDETvalueusedforpowerlimiting=HDETreadingat(maxTxpowerlimit-6dB)Span:HighestHDETvalueusedforpowerlimiting=HDETreadingat(maxTxpowerlimit+2dB)-offset,RxCalibration(1),RxCalibration(2),RxCalibration-IM2(3),IM2calibrationisdonetoimprovereceptionincertaintypesofjammingsituations.ImproperIM2calibrationmaycausethemobilestationsFERtoincreaseinthesejammingsituations.,RxCalibration-IM2(4),Usingasignalgenerator,placeanAMmodulatedcarrierwiththefollowingcharacteristicsattheinputtotheantennaThefrequencyofthecarriermustbeoffsetfromtheRxreferencefrequencyby5.0MHz.Programthemodulationtonebesinusoidalandtohaveafrequencyof20kHz.ProgramthesignalgeneratorsuchthattheAMmodulationdepthis56%.Programthesignalstrengthtobe25dBmattheantennasinput.ChecktheRSSIusingtheFTMfunctionGetRXAGC.IftheRSSIissaturated(attheextremelimit),adjustthesignalsstrengthaccordinglyuntiltheRSSIisnolongersaturated.CalltheFTMfunctionGetCDMAIM2.Itmaytakeapproximately5secondsbeforethefunctionreturnsavalue.StorethetwovaluesinNV_CDMA_IM2_I_VALUEandNV_CDMA_IM2_Q_VALUE.,RxCalibration(5),FTMcommandsequence-1.SET_MODEFTM-2.RESET-3.TEST_SET_MODEPHONE_MODE_CDMA_800-4.TEST_SET_CHANNELCDMAreference=202-5.InputCDMAwaveformatref.channelandatLNA_FALL1power.-6.TEST_GET_DVGA_OFFSET-7.TEST_GET_LNA_OFFSETID=0-8.ChangeinputpowerleveltoLNA_FALL2.-9.TEST_GET_LNA_OFFSETID=1-10.ChangeinputpowerleveltoLNA_FALL3.-11.TEST_GET_LNA_OFFSETID=2-12.Repeatsteps4through11forall16channels.,RxCalibration(6),StoredinfollowingNVitems:NV_CDMA_VGA_GAIN_OFFSETNV_CDMA_VGA_OFFSET_VS_FREQNV_LNA_RANGE_OFFSETNV_CDMA_LNA_RANGE_OFFSET_VS_FREQNV_LNA_RANGE_12_OFFSETNV_CDMA_LNA_RANGE_12_OFFSET_VS_FREQNV_CDMA_LNA_3_OFFSETNV_CDMA_LNA_3_OFFSET_VS_FREQNV_CDMA_LNA_4_OFFSETNV_CDMA_LNA_OFFSET_VS_FREQNV_CDMA_IM2_I_VALUENV_CDMA_IM2_Q_VALUENV_CDMA_IM2_TRANSCONDUCTOR_VALUE,TxCalibration(1),TxCalibration(2),NonlinearRFcharacteristicsoftheTxAGCamplifierarecapturedinlinearizertables,TxCalibration(3),FTMcommandsequence1.SET_MODEFTM2.RESET3.TEST_SET_MODEPHONE_MODE_CDMA_8004.TEST_SET_CHANNELCDMAreference=2025.TEST_SET_TX_ON6.TEST_SET_PA_RANGELOW_P