《RF校准软件设计》PPT课件.ppt

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1、手机射频校准什么是射频校准？TheprocessofobtainingRFparametricdatatobeusedbythephoneforthepurposeofcompensatingfornon-lineardevices,frequencyvariations,andtemperaturevariationsOutputfromthecalibrationprocessisstoredinnon-volatile(NV)memoryDMSSusesRFNVitemsduringnormaloperationtoensuresystemperformanc

2、eismet.射频校准的意义?(1)SubscriberunitshavedifferingRFcharacteristics.-Somecharacteristicsvaryfromoneunittothenext-Othercharacteristicsvaryfromonedesigntothenext射频校准的意义?(2)ThesubscriberunitmustestimatetheRxpowerproperlytomaximizesignaltonoiseratiosandtoprovideabasisforTxpoweroutput.Thesubscr

3、iberunitmusttransmitatcorrectTxpowerleveloveritslargedynamicrange.射频校准的意义?(3)TheMSMdeviceandsystemsoftwarecombinationmust“know”theRFcharacteristicsoftheparticularunit.ThisinformationisknownasRFcalibrationdata.FailuretocompensatefordifferingRFcharacteristicsmaycausetheunittofailminimump

4、erformancespecifications.射频校准的意义?(4)CalibrationConsideration:-SomeNVItemswillbestaticperphonedesign»Ex:NV_CDMA_ENC_BTF-OtherNVitemswillvaryfromonephonetothenextandneedtobecalibrated»Ex: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,andtempe

5、ratureandfrequencyvariationsintheperformanceoftheTxandRxpathcomponentsinasubscriberunitOutputfromthecalibrationprocessarestoredinnonvolatile(NV)memoryitemsinAMSSsoftwareDMSSsoftwareloadscalibrationvaluesintoMSMregistersorusesthemforsoftwareprocessingduringnormalDMSSoperationNVitemscanb

6、eaccessedusingrawDIAGcommandsorusingDIAG-basedtools,suchastheQPSTRFCalibrationTool•SomeNVitemswillbestaticperthehardwaredesignOtherNVitemswillvaryfromoneunittothenextSomeelementswithinanNVitemcanbeextrapolatedNV项类型StaticRFNVItems:Valueisdeterminedbydesignanddoesnotchangeforthesamedesig

7、n.Ex:NV_CDMA_NONBYPASS_TIMER_ICalculatedRFNVItems:Valueiscalculatedbasedonotherparametersofthedesignconfigurationandvaluedoesnotchangeforagivenconfiguration.Ex:NV_CDMA_LNA_RANGE_RISE_IMeasuredRFNVItems:ValueisdefinedbyRFcalibrationprocessandeachdevicemayhaveadifferentvalue.Ex:NV_CDMA