1040 A New Method for Noise Figure Measurement Base on Modern VNA英文文献资料

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1、ANewMethodforNoiseFigureMeasurementBaseonModernVNALi,YangzheApplicationEngineerApr.14,2015AgendaMeasurenoisefigureBaseonmodernVNAPage2–OverviewofNoiseFigure–NoiseFigureMeasurementTechniques–PNA-X’sUniqueApproachGainSo/NoDUTSi/NiWhyDoWeCareAboutNoise?–Noisecausessyst

2、emimpairments•DegradesqualityofserviceofTV,cellphones•Limitsrangeofradarsystems•Increasesbit-errorrateindigitalsystems–Waystoimprovesystemsignal-to-noiseratio(SNR)Q•Increasetransmitpower•DecreasepathlossI•Lowerreceiver-contributednoise•Generallyeasierandlessexpensiv

3、etodecreasereceivernoisethantoincreasetransmittedpowerMeasurenoisefigureBaseonmodernVNAPage3NoiseFigureDefinitionNoisefigureisdefinedintermsofSNRdegradation:(Si/Ni)(No)F==(noisefactor)(So/No)(GxNi)NF=10xlog(F)(noisefigure)GainSo/NoDUTSi/NiTestsystemisassumedtobe50ΩM

4、easurenoisefigureBaseonmodernVNAPage4EffectiveNoiseTemperature–Availablenoisepowerofapassivetermination=kTB•kisBoltzmann’sconstant(1.38x10-23J/K)•kTB=-174dBmina1Hzbandwidth•Foragivensystembandwidth,noiseisproportionaltotemperature–Amountofnoiseproducedbyadevicecanbe

5、expressedasanequivalentnoisetemperature(e.g.15dBENR→8880K)–Noisefactorcanbeexpressedaseffectiveinputnoisetemperature•Notthephysicaltemperatureoftheinputtermination•TheoreticaltemperatureofinputterminationconnectedtoanoiselessdeviceresultinginthesameoutputnoisepowerT

6、e=290x(F-1)MeasurenoisefigureBaseonmodernVNAPage5EffectiveNoiseTemperatureVersusNoiseFigure1000.00100.00Te(K)10.001.000.00.51.01.52.02.53.03.54.04.55.0NF(dB)MeasurenoisefigureBaseonmodernVNAPage6NoiseFigureSeminarImportanceofNoiseFigureAccuracy–R&D–Bettercorrelation

7、betweensimulationandmeasurement–Betteroptimizationoftransmit/receivesystems•Improvedmeasurementaccuracyresultsinsmallerguardbands•TighterspecificationsonLNAmeanslower-powertransmitamplifiersRPULSEDCOBAMPREDRIVERPOWERDUPLEXFAMPHOPPBTxORFANTENNAPFTRANSMITTER/PRFPulseE

8、XCITERSTALGeneratorModulatorReceiverOProtectionDigitalSignalRadarDataProcessorProcessorM(rangeandDopplerFFT)(trackingloops,etc.)MILNAFrequ