北斗二代多通道收发模块小型化设计

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1、ABSTRACTABSTRACTTheBeidousatellitenavigationsystem,whichisdevelopedandoperatedindependentlybyChinahasbeengraduallyusedindailylifeandmilitaryfieldthroughcontinuousdevelopmentandimprovement.Theresearchofitsgroundstationtransceiversystemhasalsoattractedmuchattention.A

2、ccordingtotheresearchsituationanddevelopmenttrendofCompassIItransceiversystem,thisthesiscompletestheminiaturizationdesignandmeasurementofamulti-channeltransceivermodule,whichisbasedontheauthorizedserviceprovider-basedB3band.Themaincontentoftheworkis:1.Thedesignoftr

3、ansceiverchannelcircuitformulti-channeltransceivermoduleiscompletedaccordingtotherequirementoftheCompassIItestsystem.AndthetransformingoftheinputRFsignaltotheIFsignalinreceivingchannelhasbeenrealized;afrequencyconversionstructuretocompletethedownconversionreception

4、isused.Inordertofacilitatethedebuggingoftheoutputsignalamplitudeofeachreceivingchannel,AGCcircuithasbeenemployedtoamplifytheIFsignalinthereceivingchannel.Inthetransmittingchannel,afrequencyconversionstructureisusedtoachievetheIFtoRFfrequencyconversion,andatwo-stage

5、powersplitterisusedtoachievethesignaldistributionoftheeighttransmitoutputports.2.Duetothepointthatupperandlowerfrequencyconversioncircuitsofthemodulerequireaprecise,stable,highspectralpuritylocaloscillatorsignal,thePLLcircuitwhichiscontrolledbytheCPLDchipisusedaslo

6、caloscillatorsignalsource.SAWfiltersareusedtoensurethebandwidth,out-of-bandrejectionandbandflatnessofeachreceivingchannel,becausetheycanmeetthedesignrequirementofthemoduleminiaturization,itisnecessarytoadjustSAWfilters’matchingcircuitaccordingtotheoutputsignalsofre

7、ceivingchannels,becauseithasmoreimportantinfluenceonparametersofthemodulereceivingchannel.TheinputmatchingcircuitoftheAGCcircuitwhichisusedastheIFamplifierhasagreaterimpactontheamplifiergain,itneedssimulatedbytheADSsoftandthensolderedbychoosingappropriatedevices.ad

8、dtheappropriatemetalshieldcanensureeachmodulecircuitworkproperly.3.Inordertoaccomplishtheselectionofthecorrespondingchips,thesimulationofthedesig