High-Speed Data Conversion for Digital.pdf

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1、High-SpeedDataConversionforDigitalUltra-WidebandRadioReceiversbyPuneetPrashantNewaskarSubmittedtotheDepartmentofElectricalEngineeringandComputerScienceinpartialfulfillmentoftherequirementsforthedegreeofMasterofScienceinElectricalEngineeringandComputerScienceattheMASSACHUSETTSINSTI

2、TUTEOFTECHNOLOGYJune2003
cMassachusettsInstituteofTechnology2003.Allrightsreserved.Author..............................................................DepartmentofElectricalEngineeringandComputerScienceMay23,2003Certifiedby..........................................................

3、AnanthaP.ChandrakasanProfessorofElectricalEngineeringandComputerScienceThesisSupervisorAcceptedby.........................................................ArthurC.SmithChairman,DepartmentCommitteeonGraduateTheses2High-SpeedDataConversionforDigitalUltra-WidebandRadioReceiversbyPune

4、etPrashantNewaskarSubmittedtotheDepartmentofElectricalEngineeringandComputerScienceonMay23,2003,inpartialfulfillmentoftherequirementsforthedegreeofMasterofScienceinElectricalEngineeringandComputerScienceAbstractUltrawidebandradio(UWB)isanewhigh-speedwirelesstechnologythatusessub-n

5、anosecondpulsestotransmitinformation.Implementinganall-digitalUWBre-ceiverhasnumerousbenefitsrangingfromlowcostandeaseofdesigntoflexibility.DigitizinganRFsignalneartheantenna,however,introducesitsownsetofchal-lengesandhastraditionallybeenconsideredinfeasible.Ahigh-speed,high-resolu

6、tionanalog-digitalconverter(ADC)isdifficulttodesign,andisextremelypower-hungry.However,duetotheuniquespectralcharacteristicsofUWBsignalsandtheirnoiseenviroment,itcanbeshownthatreliabledetectionofaUWBsignalisachievablewithveryfewbitsofresolutionintheADC.Inthisthesis,theroleofquantiz

7、ationnoiseinUWBsystemsisanalyzedandthesufficiencyof4bitsofprecisionisdemonstrated.Dataconversionatseveralgigasamples/sec(GSPS)isneverthelesschallenging,evenatlowresolutions.Thefeasibilityofthisproblemhasbeeninvestigatedthroughthedesignandimplementationofa4-bit,4GSPSADCforaprototype

8、UWBsystem,usinga0.18µmCMOSprocess.Atime-