AD8340射频自动增益控制(AGC)芯片

700MHzto1000MHzRFVectorModulatorAD8340Rev.BInformationfurnishedbyAnalogDevicesisbelievedtobeaccurateandreliable.However,noresponsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorotherrightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.NolicenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofAnalogDevices.Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.OneTechnologyWay,P.O.Box9106,Norwood,MA02062-9106,U.S.A.Tel:[phone]©2004–2007AnalogDevices,Inc.Allrightsreserved.FEATURESCartesianamplitudeandphasemodulation700MHzto1.0GHzfrequencyrangeContinuousmagnitudecontrolof−2dBto−32dBContinuousphasecontrolof0°to360°Outputthird-orderintercept24dBmOutput1dBcompressionpoint11dBmOutputnoisefloor−149dBm/Hz@fullgainAdjustablemodulationbandwidthupto230MHzFastoutputpowerdisable4.75Vto5.25Vsingle-supplyvoltageAPPLICATIONSRFPAlinearization/RFpredistortionAmplitudeandphasemodulationVariableattenuatorsandphaseshiftersCDMA2000,GSM/EDGElinearpoweramplifiersSmartantennasFUNCTIONALBLOCKDIAGRAM90°0°VPS2QBBMQBBPRFIPRFIMDSOPIBBMIBBPRFOPRFOM04699-001VPRFCMOPFigure1.GENERALDESCRIPTIONTheAD8340vectormodulatorperformsarbitraryamplitudeandphasemodulationofanRFsignal.BecausetheRFsignalpathislinear,theoriginalmodulationispreserved.Thispartcanbeusedasageneral-purposeRFmodulator,avariableattenuator/phaseshifter,oraremodulator.Theamplitudecanbecontrolledfromamaximumof−2dBtolessthan−32dB,andthephasecanbeshiftedcontinuouslyovertheentire360°range.Formaximumgain,theAD8340deliversanOP1dBof11dBm,anOIP3of24dBm,andanoutputnoisefloorof−149dBm/Hz,independentofphase.Itoperatesoverafre-quencyrangeof700MHzto1.0GHz.ThebasebandinputsinCartesianIandQformatcontroltheamplitudeandphasemodulationimposedontheRFinputsignal.BothIandQinputsaredc-coupledwitha±500mVdifferentialfull-scalerange.Themaximummodulationband-widthis230MHz,whichcanbereducedbyaddingexternalcapacitorstolimitthenoisebandwidthonthecontrollines.BoththeRFinputsandoutputscanbeuseddifferentiallyorsingle-endedandmustbeac-coupled.TheRFinputandoutputimpedancesarenominally50Ωovertheoperatingfrequencyrange.TheDSOPpinallowstheoutputstagetobedisabledquicklytoprotectsubsequentstagesfromoverdrive.TheAD8340operatesoffsupplyvoltagesfrom4.75Vto5.25Vwhileconsumingapproximately130mA.TheAD8340isfabricatedusingtheAnalogDevices,Inc.proprietary,highperformance25GHzSOIcomplementarybipolarICprocess.Itisavailableina24-leadRoHS-compliantLFCSPpackageandoperatesovera−40°Cto+85°Ctempera-turerange.Evaluationboardsareavailable.AD8340Rev.B|Page2of20TABLEOFCONTENTSFeatures..............................................................................................1Applications.......................................................................................1FunctionalBlockDiagram..............................................................1GeneralDescription.........................................................................1RevisionHistory...............................................................................2Specifications.....................................................................................3AbsoluteMaximumRatings............................................................4ESDCaution..................................................................................4PinConfigurationandFunctionDescriptions.............................5TypicalPerformanceCharacteristics.............................................6TheoryofOperation......................................................................10RFQuadratureGenerator.........................................................10I-QAttenuatorsandBasebandAmplifiers..............................11OutputAmplifier........................................................................11NoiseandDistortion..................................................................11GainandPhaseAccuracy..........................................................11RFFrequencyRange..................................................................11ApplicationsInformation..............................................................12UsingtheAD8340......................................................................12RFInputandMatching.............................................................12RFOutputandMatching..........................................................13DrivingtheI-QBasebandControls.........................................13InterfacingtoHighSpeedDACs..............................................14CDMA2000Application...........................................................14EvaluationBoard............................................................................16SchematicandArtwork.............................................................18OutlineDimensions.......................................................................20OrderingGuide..........................................................................20