小功率FM发射机电路的设计--小功率FM调频发射机电路的设计摘要1933年，世界上第一台发射机诞生。美国发明家阿姆斯特朗发明了短波（FM）收音机。1939年,FM发射机的发明者阿姆斯特朗在美国建立了第一个FM广播的发射站。同年,调幅收音机开始在美国出售。从此FM发射机技术开始迅速发展。在各行各业中得到应用，尤其是小功率FM发射机的应用更为广泛。.论文是关于小功率调频发射机电路的设计。通常小功率发射机采用直接调频方式，其中调频振荡级主要是产生频率稳定，中心频率符合指标要求的正弦波信号，且其频率受到外加音频信号电压调变，缓冲级主要是对调频振荡信号进行放大，以提供末级所需的激励功率，同时对前后级起有一定的隔离作用，为避免末级功放的工作状态变化而直接影响振荡级的频率稳定度。功放级的任务是确保高效率输出足够大的高频功率，并馈送到天线进行发射。本设计采用DSP+锁相环技术，频率更加稳定，频率不会随环境变化而产生频飘。关键词：小功率调频发射机直接调频调频振荡锁相环Abstract1933,theworld'sfirsttransmitterwasborn.AmericaninventorsArmstronginventedtheshort-wave(FM)radio.1939,theinventorofFMtransmittersArmstrongoftheUnitedStatesestablishedthefirstFMradiotransmitters.Thesameyear,theAMradiobegansaleintheUnitedStates.SincethenFMtransmittertechnologyhasbeguntodeveloprapidly.Inallwalksoflifetobeapplied,particularlyinlow-powerFMtransmittersofmoreextensive..Thepaperisaboutthelowpowerfrequencymodulatedtransmitterelectriccircuitdesign.Theusuallowpowertransmitterselectsthedirect-frequencymodulationmethod,frequencymodulationvibratesthelevelmainlyishasthefrequencytobestable,thecenterfrequencyconformstothetargetrequestsinewavesignal,alsoitsfrequencyreceivesthesur-tonictrainsignallingvoltageregulation,thebuffermainlyisvibratesthesignaltothefrequencymodulationtocarryontheenlargement,byprovidesthegrid-drivingpowerwhichthelaststageneeds,atthesametimeplaystothearoundlevelhasthecertainisolationrole,foravoidstheworkingmodeactivestatuschangewhichthelaststagemeritputsbutaffectingthevibrationleveldirectlythefrequencystability.Themeritputsthelevelthedutyguaranteesthehighefficiencyoutputenoughbighighfrequencypower,andpresentstotheantennacarriesonthelaunch.ThisdesignUSEStheDSP+phaselockedlooptechnique,frequencymorestable,frequencywillnotchangewiththeenvironmentandproducefrequencywave.Keywords:SmallpowerFMtransmitter,DirectFM,FMoscillation,Phaselockedlooptechnique目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc293650828"摘要PAGEREF_Toc293650828\hIHYPERLINK\l"_Toc293650829"AbstractPAGEREF_Toc293650829\hIIHYP