应用於手提式数位电视接收器之

NationalTaiwanUniversityDepartmentofElectricalEngineering&GraduateInstituteofElectronicsEngineering應用於手提式數位電視接收器之射頻前端電路設計DesignofRFFront-EndCircuitsforDVB-HReceiversAdvisor:Shen-IuanLiuStudent:Hung-HsuWangElectronicCircuitsLab.Hung-HsuWang2OutlineProposedreceiverforDVB-HsystemAnoisecancelingLNAforDVB-HtunersAlowpowerMixer/VGAforDVB-HtunersElectronicCircuitsLab.Hung-HsuWang3MotivationTheEuropeansystemforthefixedandportablereceptionofdigitalTV,DVB-T,hasbeenavailableforseveralyears.Recently,companieshavebeendevelopingsolutionstoreceiveDVBsignalsonmobileandhandheld(DVB-H)terminals,andintegratingthemintoGSMor3Gconvergenceterminals.Inthebattery-poweredenvironmentofhandhelddevices,theconstraintsofsmallphysicalsizeandlowpowerconsumptionrequirenewtunerconceptsthatdifferfromclassicalsuperheterodynereceiverarchitectures.LNAADCMixerADCPhaseMismatch1PhaseMismatch2VCOSynthesizerDACDACDigitalBasebandOffsetCancellationDACOffsetCancellationDACVGA1VGA2S-DBalunBandSelectfilterExternalLNADVB-HReceiverICMixerVGA1VGA2LPFLPFThisworkElectronicCircuitsLab.Hung-HsuWang4AnoisecancelingLNAforDVB-HtunersNoisecancelingprinciple;Gm-boostingtechniqueAnoisecancelingLNAforDVB-HtunersInputCGstageNoisecancellationstageOutputvariablegainstageR1R1M1M2M3M4M5M6RsRs+Vin/2-Vin/2CcpCcpVoutVb1Vb2Vb3Vb4ElectronicCircuitsLab.Hung-HsuWang5AlowpowerMixer/VGAforDVB-HtunersAlowpowerMixerdesignRFtransconductorLOswitchingpairAlowpowerVGAdesignGaincontrolmechanismARFfront-endcircuitforDVB-HtunersOffsetcancellationloopLNAMixerBufferOffsetCancellationVGA1I_ChannelBufferOffsetCancellationVGA1MixerQ_Channel