频谱分析仪和矢量信号分析仪

AnritsuBasicTrainingMaterialconfidential2•…confidential3confidential4•(FFT)()Aff1f2confidential5Aff1f2confidential6•confidential7•(dBm)=(dBm)-(dB),dBc,-dBc0-20-40-60-80-100-60-300+30.TOIRBW=10KHzRBW=1KHzconfidential8•MixerLevel(dBm)DISTORTION,dBc-105-107-109-111-113-115-90-60-300PotentialDynamicRangeconfidential9•••RBW••VBWconfidential10•()RBW3dB3dBBWLOMixer/(RBW)RBWconfidential11•RBWconfidential12•RBW3dB10kHz10kHzRBWconfidential13•RBW10kHzRBW=10kHzRBW=1kHz10kHz60dBBW=15kHz7.5kHz3dB60dBconfidential14•RBWconfidential15•RBWRBW=100kHzRBW10kHzRBW1kHzRBW10dB10dB(dB)=10log(RBW)/(RBW)confidential16confidential17(VBW)confidential18/100kHz:-123.77dBc/Hzconfidential1950kHz,100kHz,:-69.86dBm/chconfidential202X99NdB3dB:246.4kHzconfidential21ACPR:L1:-70.74U1:-70.74L2:-78.47U2:-78.31confidential22-13.52dBmconfidential230-5-10-15-20-25-30-35-40-45-50AT15dB#RBt10kHz#T:SMPRLV:-54.1dBmTS1.9msVBt30kHz#DELAY:-1.318msFREQ:862.126600MHzTIMESPAN:1.9msPOWERPOWER(dBm):-67.08dBmPOWER(W):196pWconfidential24timeGATEFrequencyconfidential25DUTIFLOCRTDisplayTrackingGeneratorTrackingRFinTGoutAdjustDUTconfidential26•––••–––––confidential27••–AM,FM,PM,Pulse–IQ–/TDMACDMA•••confidential“EMod(t)=EC(t).cos(wC(t).t+FC(t))FMAMFM时间域频率域相位域ÛCtfCfUCUCÛCconfidential29AmplitudeModulation•[1+mcos(ѡmt)]Acos(ѡct)•E(t)=[1+mcos(ѡmt)]cos(ѡct)=cos(ѡct)+(m/2)cos(ѡct-ѡmt)+(m/2)cos(ѡct+ѡmt)•cos(ѡct-ѡmt)cos(ѡct+ѡmt)ѡm•cos(ѡct)•1/3confidential30m•:E(t)=[1+mcos(ѡmt)]cos(ѡct)•m=(Ec-Emin)/Ec=(Emax-Ec)/Ec=(Emax-Emin)/(Emax+Emin)•:m/2=Esb/Ec•logm–log2=logEsb–logEc•m(dB)=-[Ec(dB)-Esb(dB)-6dB]confidentialAmplitudeModulationTimeDomainFrequencyDomainPhaseDomainUMod(t)=UC(t).cos(wC(t).t+FC(t))AMUCUCm2ÛCÛCfCm2ÛCm2ÛCm2ÛCUAMÛCÛCUminUmaxm=UC/ÛC=(Umax-Umin)/2•ÛCconfidential32AngleModulation•frequencymodulation(FM)andphasemodulation(ØM)都是角度调制•频率：Ѡ(t)=d[ϕ(t)]/dt,相角：ϕ(t)=∫Ѡ(t)dt•Ѡ(t)=Ѡc+ΔѠpkf(t)•E(t)=cos[ѡct+(ΔѠpk/Ѡm)sinѠmt]=J0(β)cosѠct-J1(β)[cos(Ѡc-Ѡm)t+cos(Ѡc+Ѡm)t]-J2(β))[cos(Ѡc-2Ѡm)t+cos(Ѡc+2Ѡm)t]-J3(β))[cos(Ѡc-3Ѡm)t+cos(Ѡc+3Ѡm)t]-……•调制指数：β=ΔѠpk/ѠmconfidentialAngleModulationTimeDomainFrequencyDomainfCfÛCÛCfFUMod(t)=UC(t).cos(wC(t).t+FC(t))FMFMPhaseDomain+DFC-DFCf+DfCfC-DfCtM=Df/fmodf(t)=dF(t)/dtconfidential34Vectormodulation••IQI(t)cos(ѡct),Q(t)cos(ѡct-90),•E(t)=I(t)cos(ѡct)+Q(t)cos(ѡct-90)=I(t)cos(ѡct)+Q(t)sin(ѡct)={[I(t)]2+Q[t]2}1/2cos(ѡct-TAN-1(Q(t)/I(t))•2cos(ѡct)2cos(ѡct-90).•E(t)=I(t)cos(ѡct)+Q(t)cos(ѡct-90)•E(t)*2cos(ѡct)=2I(t)cos(ѡct)cos(ѡct)+2Q(t)cos(ѡct-90)cos(ѡct)=2[I(t)/2]cos(ѡct-ѡct)+2[I(t)/2]cos(ѡct+ѡct)+2[Q(t)/2]cos(ѡct-ѡct+90)+2[Q(t)/2]cos(ѡct+ѡct-90)=I(t)+I(t)cos(2ѡct)+Q(t)cos(2ѡct-90)•I(t)cos(2ѡct)I(t).confidentialConventionalModulationKeyingDigitalModulation010100101010010101001AMFMASKFSKPSKFMUMod(t)=UC(t).cos(wC(t).t+FC(t))AMFMFMttUUUconfidentialBPSKMultiplierasBPSKmodulatorUDataUBPSKUCF=180°F=0°QIconfidentialBPSK时域和频域010TBittÛU-fBit+fBitfCfBitconfidentialBPSK,1Mbps(unfiltered)confidentialQPSK相位域ABCD1234567tBitrate,DataratefBitABCDSerial/ParallelConversionDiBitsI(t)Q(t)SymbolratefBit2QI“1”180º“0”0º“10”“11”“00”“01”“0”90ºBitSequence1.2.DibitsIQTransmittedPhase001011010010110145º(D)135º(A)225º(C)315º(B)confidentialQPSK-ModulatorIQ0/180°0/180°SRF-OutRF-In0°90°I-ChannelQ-Channelconfidential41FilteringUnfilteredFilteredconfidential42EVMEVM?ErrorVectorMagnitude(EVM),EVMEVMEVM