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1、實(shí)用小功率FM發(fā)射機(jī)電路設(shè)計(jì)作者姓名:XXXXX專業(yè)名稱:通信工程指導(dǎo)教師:XXXX文檔實(shí)用摘要1933年,世界上第一臺(tái)發(fā)射機(jī)誕生。美國(guó)發(fā)明家阿姆斯特朗發(fā)明了短波(FM)收音機(jī)。1939年,FM發(fā)射機(jī)的發(fā)明者阿姆斯特朗在美國(guó)建立了第一個(gè)FM廣播的發(fā)射站。同年,調(diào)幅收音機(jī)開始在美國(guó)出售。從此FM發(fā)射機(jī)技術(shù)開始迅速發(fā)展。在各行各業(yè)中得到應(yīng)用,尤其是小功率FM發(fā)射機(jī)的應(yīng)用更為廣泛。.論文是關(guān)于小功率調(diào)頻發(fā)射機(jī)電路的設(shè)計(jì)。通常小功率發(fā)射機(jī)采用直接調(diào)頻方式,其中調(diào)頻振蕩級(jí)主要是產(chǎn)生頻率穩(wěn)定,中心頻率符合指標(biāo)要求的正弦波信號(hào),且其頻率受到外加音頻信號(hào)電壓調(diào)變,緩沖級(jí)主要是對(duì)調(diào)頻振
2、蕩信號(hào)進(jìn)行放大,以提供末級(jí)所需的激勵(lì)功率,同時(shí)對(duì)前后級(jí)起有一定的隔離作用,為避免末級(jí)功放的工作狀態(tài)變化而直接影響振蕩級(jí)的頻率穩(wěn)定度。功放級(jí)的任務(wù)是確保高效率輸出足夠大的高頻功率,并饋送到天線進(jìn)行發(fā)射。本設(shè)計(jì)采用DSP+鎖相環(huán)技術(shù),頻率更加穩(wěn)定,頻率不會(huì)隨環(huán)境變化而產(chǎn)生頻飄。關(guān)鍵詞:小功率調(diào)頻發(fā)射機(jī)直接調(diào)頻調(diào)頻振蕩鎖相環(huán)文檔實(shí)用Abstract1933,theworld'sfirsttransmitterwasborn.AmericaninventorsArmstronginventedtheshort-wave(FM)radio.1939,theinventorofF
3、MtransmittersArmstrongoftheUnitedStatesestablishedthefirstFMradiotransmitters.Thesameyear,theAMradiobegansaleintheUnitedStates.SincethenFMtransmittertechnologyhasbeguntodeveloprapidly.Inallwalksoflifetobeapplied,particularlyinlow-powerFMtransmittersofmoreextensive..Thepaperisaboutthelow
4、powerfrequencymodulatedtransmitterelectriccircuitdesign.Theusuallowpowertransmitterselectsthedirect-frequencymodulationmethod,frequencymodulationvibratesthelevelmainlyishasthefrequencytobestable,thecenterfrequencyconformstothetargetrequestsinewavesignal,alsoitsfrequencyreceivesthesur-to
5、nictrainsignallingvoltageregulation,thebuffermainlyisvibratesthesignaltothefrequencymodulationtocarryontheenlargement,byprovidesthegrid-drivingpowerwhichthelaststageneeds,atthesametimeplaystothearoundlevelhasthecertainisolationrole,foravoidstheworkingmodeactivestatuschangewhichthelastst
6、agemeritputsbutaffectingthevibrationleveldirectlythefrequencystability.Themeritputsthelevelthedutyguaranteesthehighefficiencyoutputenoughbighighfrequencypower,andpresentstotheantennacarriesonthelaunch.ThisdesignUSEStheDSP+phaselockedlooptechnique,frequencymorestable,frequencywillnotchan
7、gewiththeenvironmentandproducefrequencywave.文檔實(shí)用Keywords:SmallpowerFMtransmitter,DirectFM,FMoscillation,Phaselockedlooptechnique文檔實(shí)用目錄摘要IABSTRACTII目錄III前言11調(diào)頻發(fā)射系統(tǒng)21.1調(diào)頻發(fā)射機(jī)的性能指標(biāo)概念21.2調(diào)頻發(fā)射機(jī)性能指標(biāo)及設(shè)計(jì)要求31.3調(diào)頻發(fā)射機(jī)基本原理方框圖41.4發(fā)射機(jī)系統(tǒng)各部分波形圖41.5調(diào)頻發(fā)射機(jī)系統(tǒng)方框圖各部分簡(jiǎn)介51.6調(diào)頻發(fā)射機(jī)的工作原理62鎖相環(huán)路(PLL)82.1鎖相環(huán)