《射频系统介绍》ppt课件

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1、IntroductionofRadioFrequencySystems中華大學通訊系田慶誠tien@chu.edu.tw1OutlineAnalogradiocommunicationsystemDigitalwirelesscommunicationsystemRadioFrequencytransceiverRFreceiverspecificationsRFtransmitterspecificationsHighpowerRFtransmitter2中華大學通訊系AnalogradiocommunicationsystemAmplitudemodulat

2、ionHomodynereceiverHeterodynereceiver外差式接收機FrequencymodulationSuperheterodynereceiver超外差式接收機3中華大學通訊系AmplitudemodulationreceiverHomodynereceiver1906Forest真空管1906Fessenden調幅AM廣播1912Armstrong再生檢波收音機WiderRFfilterbandwidthBadnoiseimmunityDemodulation解調AM576KHzAF100~2KHz4中華大學通訊系Amplitudemod

3、ulationreceiverHeterodynereceiverNarrowIFfilterbandwidthGoodnoiseimmunityDemodulation解調AM1413kHzAF100~2KHzLO958kHzIF455kHzBetterSensitivity5中華大學通訊系FrequencymodulationreceiverSuperheterodynereceiver1918Armstrong超外差收音機1933Armstrong調頻FM收音機ExcellentnoiseimmunityGoodadjacentchannelrejectio

4、nBulkyIFfilterandcircuitsHigherpowerdissipationFM100MHz1stLO89.3MHz2ndLO10.245MHz1stIF10.7MHzBestSensitivity2ndIF455kHzDemodulation解調6中華大學通訊系Remotecontrollerexample7中華大學通訊系8RemotecontrollerexampleFMreceiverMC13135910DigitalwirelesscommunicationsystemFSK/ASKWirelessmodemRFIDPSK/QAM(+OF

5、DM)Cellularphone(GSM,GPRS,3GWCDMA)Digitalcordlessphone(DECT,PHS)WLAN(802.11a/b/g/n)WPAN(BT,Zigbee,802.15.3UWB)WMAN(802.16aWiMAX,802.16e)DVB-T,DVB-H,DABGPS11中華大學通訊系SpectrumofDigitalPhonesFrequencyDivisionDuplex,FDDTDD12中華大學通訊系WLAN&WPANSpectrumTimeDivisionDuplexonly13中華大學通訊系RFIdentifica

6、tionSystem14中華大學通訊系GPS15GPRSDirectConversionRFIC16中華大學通訊系Bluetooth17WLAN802.11bIntersil2001version18中華大學通訊系WLAN802.11bIntersil2003version19中華大學通訊系5GHzWLAN802.11aIntersil2003version20中華大學通訊系RFTransceiverReceiverDoubledownconversion(RFdownconverter+Quadraturedemodulator,數百MHzIF)Low-IFco

7、nverter(數十MHz~數百KHz)Directconversion(Zero-IFreceiver)TransmitterDoubleupconversionQuasi-directIQmodulation(Low-IF)21中華大學通訊系WLAN802.11aRFTransceiver5.7GHzU-NIIRx/Txmodule(FDDmode)DoubledownconversionDoubleupconversion22中華大學通訊系TD-SCDMARFTransceiverMAXIMSiGeBiCMOSZero-IFreceiverQuasi-dir

8、ectIQ