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小信号调频收音机电路设计小信号调频收音机电路设计I摘要单片机自从20世纪70年代问世以来，以极其高的性能价格比受到人们的重视和关注，所以应用很广，发展很快。单片机的特点是体积小、集成度高、重量轻、抗干扰能力强，对环境要求不高，价格低廉，可靠性高，灵活性好，开发较为容易。正因为单片机有如此多的优点，因此其应用领域之广，几乎到了无孔不入的地步。在我国，单片机已被广泛地应用在工业自动化控制、自动检测、智能仪表、智能化家用电器、航空航天系统和和国防军事、尖端武器等各个方面。我们可以开发利用单片机系统以获得很高的经济效益。更重要的意义是单片机的应用改变了控制系统传统的设计思想和方法。以前采用硬件电路实现的大部分控制功能，正在用单片机通过软件方法来实现。这种以软件结合硬件或取代硬件并能提高系统性能的控制技术称为微控制技术。例如，本文所要论述的通过单片机来控制TEA5767芯片及驱动LED数码显示实现FM收音并显示频率。现在人们常使用的收音机为手动调频收台，使用较为麻烦，而且由于接收灵敏度不高，所接收的频段较窄。本设计采用的是TEA5767芯片，它是由PHILIPS公司推出的针对低电压应用的单芯片数字调谐FM立体声收音机芯片。关键词：单片机FM收音机TEA5767小信号调频收音机电路设计IIAbstractThesinglechiphascomeoutsincethe1970s,comparedtoisvaluedpeople'sandtheattentionbytheextremelyhighperformanceprice,thereforetheapplicationisverybroad,thedevelopmentisveryquick.Monolithicintegratedcircuit'scharacteristicisthevolumeissmall,theintegrationrateishigh,theweightislight,antijammingability,isnothightotheenvironmentrequest,thelowinprice,thereliabilityishigh,theflexibilityisgood,thedevelopmentiseasier.Becausejustthemonolithicintegratedcircuithassomanymerits,thereforebroaditsapplicationdomain,arrivedatthesituationwhichnearlyseizeseveryopportunity.Inourcountry,themonolithicintegratedcircuitwidelyhasbeenappliedintheindustrialautomationcontrol,theautomaticdetection,theintelligentmeasuringappliance,theintellectualizeddomesticelectricappliances,theaerospacesystemandwiththenationaldefensemilitary,theadvancedweaponandsooneachaspect.Wemaydevelopusingthemonolithicintegratedcircuitsystemobtaintheveryhigheconomicefficiency.Amorevitalsignificancewasmonolithicintegratedcircuit'sapplicationchangedthecontrolsystemtraditiondesignconceptandthemethod.Beforeusesmajorityofcontrolfunctionwhichthehardwarecircuitrealizes,isrealizingwiththemonolithicintegratedcircuitthroughthesoftwaremethod.Thiskindorsubstitutesforthehardwarebythesoftwareunionhardwareandcanenhancethesystemperformancethecontroltechnologytobecalledthemicrocontroltechnology.Forexample,thisarticleneedstoelaboratecontrolstheTEA5767chipthroughthemonolithicintegratedcircuitandactuatestheLEDliquidcrystaldisplaytorealizetheFMreceptionandtodemonstratethefrequency.NowthepeopleoftenusetheradioreceivesTaiwanforthemanualfrequencymodulation,theuseismoretroublesome,moreover,becausethereceivingsensitivityisnothigh,receivesthefrequencybandisnarrow.WhatthisdesignusesistheTEA5767chip,itispromotesbyPHILIPSCorporationinviewofthelowvoltageapplicationsinglechipdigitharmoniousFMstereophonicreceiverchip.Keywords：singlechip,FMradio,TEA5767小信号调频收音机电路设计III目录摘要................................................................................................................IAbstract.......................................................................................................II目录..............................................................................................................III前言................................................................................................................11FM收音机介绍...........................................................................................21.1发射系统的简单概述......................................................................21.2接收系统的简单概述......................................................................21.3典型数字式收音机模块组成...........................................................31.4收音机的调制方案简单介绍和该方案原理简单介绍..................41.4.1收音机的调制方案简单介绍....................................................41.4.2调频广播收音机的原理............................................................62方案设计与硬件选择................................................................................82.1本方案涉及到的硬件选择..............................................................82.2无线芯片的选择...............................................................................82.2.1TEA5767方案选择...................................................................82.2.2TEA5767的I2C总线...............................................................92.3控制模块...........................................................................................92.3.1STC89C52外形和引脚..............................................................92.3.2STC89C52主要功能................................................................112.3.3STC89C52的控制电路............................................................112.4功放模块.........................................................................................132.4.1TDA2822基本信息............................................................132.4.2TDA2822工作特点.................................................................152.5LED数码管的结构.......................................................................152.5.1LED数码管简单简介.............................................................162.5.2LED数码管的工作原理..........................................................162.6电源模块.........................................................................................17小信号调频收音机电路设计IV3TEA5767芯片.........................................................................................183.1TEA5767芯片简介........................................................