安捷伦频谱仪使用说明

AgilentAgilentTechnologiesTrainingTechnologiesTrainingAgilentAgilentESAESAESAÊÊÊÊESAÊÊÊ:::NoiseNoiseModulationModulationzzzz////zzzz(ACPR)(ACPR)InIn--channelchanneloutofchanneloutofchannel{{zzzztimeAmplitude(power)frequencyLOLORFzzzzz-65dBc-30dBc0.5f0f02f0Carrier:+5dBm-60dBm-25dBm1f1f1+10kHzIn2BPSKDQPSKandQPSKπ/4DQPSK16QAMMSK32QAM8PSKErrorVectorConceptErrorVectorMagnitude(EVM)=(averageerrormagnitude)(maximumsymbolmagnitude){IQφx100%001110ESAESAESA-ESeriesSpectrumAnalyzerDigitaldemodhardwareMeasurementPersonalityGSMcdmaOne3.0GHz6.7GHz13.2GHz26.5GHzBluetooth3GESAESAESAESAESAESAESAØØØØØCWCWØØØØØØCWCWTDMATDMA:FFT()ParallelfiltersmeasuredsimultaneouslyLCDshowsfullspectraldisplayAff1f2Aff1f2Filter'sweeps'overrangeofinterestLCDshowsfullspectraldisplay/RF3.6(GHz)(GHz)0361245031236453.6(GHz)0312fIFSignalRangeLORangefssweepgeneratorLOLCDdisplayinputmixerIFfilterdetectorAffLOfsfsfsfLO-fsfLO+fLO3.66.56.5fsigLOffsigLOfLOffsig-LOffsig+RFLOIFESABAC300MHzLOLOampfilterdet21.4MHzOut21.4MHz3rdIFIFProcessing2ndLO3.6GHzRFINPUTInputAttenuator0-70dB2dBStep1stLO3-7GHz1stLO3-7GHz1stLO3-7GHzHighbandPreselectedMixer321.4MHzIFHighbandMixerA321.4MHzIFB3Hz-3GHz3GHzPreampOption321.4MHzIFC3Hz-26.5GHzIFFILTERDisplayInputSpectrumIFBandwidth(RBW)DetectorbinsVIDEOFILTERØFFTFFTØØFFTFFTØØØØCWCW:zzzz(())zzzz(())zz(())30Hz1.5GHz3.0GHz6.7GHz26.5GHz13.2GHz1Hz-5MHzRBWE4401B1Hz-5MHzRBWE4407B1Hz-5MHzRBW1Hz-5MHzRBW1Hz-5MHzRBWE4402BE4404BE4405BESA-E9kHz1.5GHz3.0GHz26.5GHz1kHz-5MHzRBWE4408BE4403B1kHz-5MHzRBWE4411B1kHz-5MHzRBWESA-L3dB3dBBWLO/DisplayRBWRBWRBWRBW33dBdB60dBBW3dBBW3dB60dB60dBBW3dBBW=RBW3dB10kHz10kHzRBW10kHzRBW=10kHzRBW=1kHzSelectivity15:110kHzdistortionproducts60dBBW=15kHz7.5kHz3dB60dBESARBWSwepttoofast,ESAESASegmentSegment,(DANL),(DANL)LOActualS/NDisplayedS/NCWSignalApparentSignalMeasurednoiselevelrelativetointernalnoiseMeasurementError1dB6.87dB3dB3.02dB5dB1.65dB10dB0.46dB15dB0.14dB20dB0.04dBpowers=powers+n-powern[mW]=+----20dB10dB0dB--------RBW10kHzRBW3kHzRBW1kHzRBW10log----------RBW1RBW2RBW----VBWVBWVBWVBWVBW::sample,sample,MakerNoiseMakerNoiseMakerNoise+RBW++VBW+ESAFrequency(MHz)1kHz-------------50dBc-50dBc-40dBcSecondOrder:2dB/dBofFundamentalThirdOrder:3dB/dBofFundamental3f2f3fPowerindB2ff2f-f1212PowerindB33212f-ff2f3f1dB3dB2dB21dB20dB1dB0-20-40-60-80-100-60-300+30.TOI/dBc=-SHISIGNAL-TO-NOISERATIO,dBc-20-40-60-80-100-60-300+30..TOISOI=-=-RFINPUTATTENUATORIFGAINYN+30dBm-115dBm(1kHzBW&0dBATTENUATION)LCD-DISPLAYRANGE80dB-10dBm-35dBm-45dBmINCREASINGBANDWIDTHORATTENUATIONSIGNAL/NOISERANGE105dBRANGE145dBMEASUREMENTMINIMUMNOISEFLOOR70dBRANGEDISTORTION80dBRANGEDISTORTION0dBc60dBc/1kHzSIGNAL/3rdORDERSIGNAL/2ndORDERSIGNAL/NOISESIDEBANDSESAESADANL100kHzto1MHz/RBWADCLogLinTimeVoltsTrace/Trace:Peak,NegativePeak,SampleDetectorModeSampleTimeVoltsPeakNegPeakDisplaypointsorbucketsPeakNegPeakSamplePeakCWSampleNegPeak:AveragingDetectors•••ACPRTimeVoltsAveragevalueSamplesofenvelopedetectoroutputDetectorModeAverage•ProcessorandDisplayLogAmpEnvelopeDetectorRBWVBWADCDetectorModeLogLinLimitedBW,butOtherBWstypicallynarrowerVideoBandwidthFilteringorSmoothingAveragingorRMSDetectorsAveragingorRMSDetectorsTrace-to-TraceAveraging,NoiseMarker—Log,Lin,Power—Log,Lin,Power•Log—CWsignals–VBW,trace–CW•—voltageenvelopes–•—time-varyingsignals–•Log—CWsignals–VBW,trace–CW•—voltageenvelopes–•—time-varyingsignals–0dBm6dBm1mW4mWLog=3dBm=(0dBm+6dBm)/2=3.98dBm=(1mW+4mW)/2=2.5mW•Log•VBWtraceLog•RMSRMSRMSAverageTypeDifferenceofabout2.5dBVideoAveraging(Y-axis):-(Avg[P1+P2+P3....])averageofthelog”PowerAveraging(alsoknownasRMS)-(log{Avg[10P1/10+10P2/10+10P3/10…..]})logoftheaverage:RMSDetectionandDetectors♦♦CDMA♦VBW3×RBW♦♦CDMA♦VBW3×RBWBW/AvgAverageTypePwrAvg(RMS)Det/DemodDetectorAverageAverage(Video/(RMS)NormalAverage(Log/RMS/V)PeakSampleNegativePeakNormalAverage(Log/RMS/V)PeakSampleNegativePeakESAESALog-pwr(video)NoVBW≥3XRBWLogAverageOutputRFspect.Log-pwr(video)YesLogPeakSpurious,harmonicsPwr(RMS)VoltagePwr(RMS)Pwr(RMS)TraceAvgNoVBW≥3XRBWPwrPeak/sampleCarr/Ph.NoiseNoVBW≥3XRBWLinSampleRFenvelope,rise/fallNoVBW≥3XRBWPwrAverageACPRNoVBW≥3XRBWPwrRMSChannelpower,non-sinemod.VideoBWAverageScaleLog/Lin/PwrDetectorMeasurement••1010MHzOCXOMHzOCXO••FrequencyCounterFrequencyCounter1Hz•ESAESAESAØØØØØØØØØØØØØØRBWRBWRBWRBWVBWVBW:ESAESAChannelpowerChannel(Bandwidth)PowerChannel(Bandwidth)PowerSPANF1(Start)F2(Stop)5MHz30kHzRBW⎪⎪⎭⎪⎪⎬⎫⎪⎪⎩⎪⎪⎨⎧⎟⎟⎟⎟⎠⎞⎜⎜⎜⎜⎝⎛−=∑==)()(10/2110)1(log10fIifIiPiNBWNbuckSpanPowerChannelNBW:ACPRCCDF6dB3dBdBaboveaveragepower9dBAvgpowerOptAYX:+B7D:DSPOptAYX:+B7D:DSP5MHz5MHzAmplifierGainvsInputPower(withCWsignal)2121.52222.52323.52424.52525.5-30-28-26-24-22-20-18-16-14-12-10InputPower(dBm)AmplifierGain(dB)InputsignalCCDFAmplifiedsignalAmplifiedsignalCCDFCCDFCCDFCCDFInputsignalCCDFBurstpowerZerospanRBWVBW((Opt1D6Opt1D6))EnvelopeDetectorVideoFilterGATEFrequencytimetimegatingŒŒŒESAESAOptBAA:FMOpt227:CableTVOptB7B:TVtrigger(OPTBAAOptBAA:FMOpt227:CableTVOptB7B:TVtrigger(OPTBAADUTSourceReceiverRFinDUTOpt1DN3GHz/50ΩOpt1DQ1.5G/75ΩOpt1DN3GHz/50ΩOpt1DQ1.5G/75ΩTrackingTGoutAdjustIFLOCRTDi