频谱分析仪的工作原理及应用

1-211ٛٛ率率B1-3111-411T.G.RF數亮1-511ƒ⋅ƒ±ƒnƒƒ1-611ٛ率率n=+2n=+1n=-2n=-1fINfLOfoscsweepLO.1-71112log10)(BWBWdBN=∆dBkHzkHzdBN1010010log10)(−==∆KTBWkTBWPn=nP2110*98.3−2310*38.1−Ω1-811)()(log10dBmNdBmSNSSNR−==ioeke•=ieoeieoe•••+•+•+•=33221iiioekekekeeieeioeo1-911ΩΩ75755050RF1-1011RRΩ=−=6.86111221ZZZR12121ZZZR−=Ω3.43ΩΩ)()(6log102dBWPdBRV+=mWmWP1)(log10mVmVVdBmVV1)(log20)(=1-1111±±±≤≥Ωµ1-12111-1311%100)(%22/12xDDnii∑==•••,,,432DDD=2D3D4D5D%77.8%100)01582.0052.003972.005622.0(2/12222=+++=xD1-14111253807501200率(MHz)dBm量RF1-15111-1611濾balog1-1711≤61-1811率率1-1911kTBWpn=1-2011≥≥≥濾路參路路參參1-211122)/4(4λππRGGPRAGPPrttettr==ttGPλ24λπeAG=1-2211rGEη221RVGEr222121=ηΩ=50RMHzrfGVE××=−31005.1MHzrfGVEAF××==−31005.1MHzfMHzrfGVEdBAFlog20log108.29log20)(+−−==VE)()()/(dBVVdBAFmdBVE+=107)()()/(++=dBmPdBAFmVdBEµ22)/4(4λππRGGPRAGPPrttettr==)(dBGr)(dBGt)4log(20λπRtrPPlog10GGGrt==1-2311222)/4(4λππRGRAGPPPetttr==)(dBGr)(dBGt)(dBG)4log(10λπRtrPPlog5λtrPP/1G2G3G)(1dBG)(2dBG)4log(20λπR12log10trPP)(2dBG)(3dBG)4log(20λπR23log10trPP)(3dBG)(1dBG)4log(20λπR31log10trPPλtrPP/1G2G3GtPrPtGrGrG1-2411ΩPhaseLockedL.O.YIGOscRFAttenuation0-50dB2dB/stepPhaseLockedOsc.FrequencyControl&RefOse5MHz300kHzOption...................FrontPanelControls&IndicatorsµProcInternalControlBusFMDemodulatorAMDemodulator300kHzWide3Hz...................10/5/1dBVertScaleDsplStorageSwp/TrigControlDsplCommPortHorzVertAnalogSigOutRampOutGateOutExtTrigLineTVLine/Field(analogdspl)VidFltrSelectionPhoneJackAudioAlertLevelCtrlExtVideoIn(LIN)(LOG)LOGAmpResBWSelectionIFGain3rdMixer2ndMixer1stMixer(110MHz)(2110MHz)(1.8GHz)(2.1-3.9GHz)(100MHz)(2GHz)Preamp1stL.O.OutTrackingGeneratorOutCalSig(-30dBm100MHz)RFIN(+20dBmmax.)1-2511%1001×∑=oiiPP1-2611*insZZ=*inZinZ*inZ