正弦信号发生器 杜恩波毕业设计

正弦信号发生器-I-摘要信号发生器是科研、教学实验及各种电子测量技术中很重要的一种信号源，随着科学技术的迅速发展，对信号源的要求也越来越高，要求信号源的频率稳定度、准确度及分辨率要高、以适应各种高精度的测量，为了满足这种高的要求，各国都在研制一些频率合成信号源，这种信号源一般都是由一个高稳定度和高准确度的标准参考频率源，采用锁相技术产生千百万个具有同一稳定度和准确度的频率信号源，为了达到高的分辨率往往要采用多个锁相环和小数分频技术，因此使电路复杂、设备体积圈套、成本较高，传统的频率合成器由于采用倍频、分频、混频和滤波环节，使频率合成技术（DDS），与传统的频率合成技术相比，DDS具有频率分辨率高、频率转变速度快、输出相位连续、相位噪声低、可编程和全数字化、便于集成等突出优点、成为现代频率合成技术中的佼佼者，得到越来越广泛的应用，成为众多电子系统中不可缺少的组成部分。本文介绍一种以AT89S52、AD9850和8279为核心器件的DDS正弦信号发生器。AD9850是一款专业极的正弦信号产生器件。它的特点正如上文所述的，电路整体结构简单，输出信号波形好，控制简单，而且易于实现程控。AT89S52和8279将在正文部分仔细的说明。本次因为是毕业设计，我也首次采用12864LCD作显示器件。采用12864作显示器件的好处是可以显示汉字。关键词：单片机，电压A/D转换，C语言沈阳工程学院毕业设计（论文）-II-AbstractSignalgeneratorisaresearch,teachingexperimentsandavarietyofelectronicmeasurementtechnologyisveryimportantasasignalsource,withtherapiddevelopmentofscienceandtechnology,demandsonthesignalsourcemoreandmorerequirethesignalsourcefrequencystability,higheraccuracyandresolutiontosuitavarietyofhigh-precisionmeasurements,inordertomeetthishighdemand,allcountriesinthedevelopmentofanumberoffrequencysynthesizedsignalsource,suchsourcesarenormallyahighstabilityandhighaccuracydegreeofstandardreferencefrequencysource,usingphase-lockedwiththesametechnologiesusedtoproducemillionsofadegreeofstabilityandaccuratefrequencysignalsource,inordertoachievehighresolutionandoftenusingmultiplephase-lockedloopfractional-Ntechnology,thecircuitcomplexequipmenttrapvolume,highcost,thetraditionalfrequencysynthesizerusedasmultiplier,divider,mixerandfilterlinks,sothatfrequencysynthesis(DDS),andcomparedtotheconventionalfrequencysynthesis,DDShasafrequencyresolutionhighfrequencychangesinspeed,theoutputphasecontinuous,lowphasenoise,programmableandfullydigital,easyintegrationandotheradvantages,becomeamodernleaderinsynthesizertechnology,getmoreandmorewidelyused,alargenumberofelectronicsystemsanindispensablecomponent.ThisarticledescribesakindofAT89S52,AD9850and8279asthecorecomponentoftheDDSsinewavegenerator.AD9850isahighlyprofessionalsinesignalgenerationdevice.Itfeatures,asdescribedabove,thecircuitstructureissimple,theoutputsignalwaveformisgood,controlissimpleandeasytoimplementprogram-controlled.AT89S52and8279willbedetailedinthebodyofthenote.Thisisbecauseagraduationproject,Iwasfirstintroduced12864LCDfordisplaydevices.12864foruseofthebenefitsofdisplaydevicecandisplayChinesecharacters.Keywords：DDS,MCU,AD9850,LCD,Clanguage正弦信号发生器-III-目录摘要·······························································································IABSTRACT·····················································································II1绪论···························································································11.1课题背景·················································································11.2系统结构·················································································12硬件电路设计················································································22.1系统设计方案···········································································22.2方案论证·················································································22.3正弦信号发生器的基本原理·························································32.4AT89S52的简介········································································32.4.1CPU系统············································································52.4.2存储器系统·········································································52.4.3I/O口和其它功能单元····························································52.4.4AT89S52的时钟电路的接法····················································52.4.5时钟信号············································································62.4.6AT89S52的各个管脚的功能介绍··············································62.4.7AT89S52的复位···································································72.4.7.1复位电路·······································································72.4.7.2开机复位后的状态···························································82.4.8AT89S52的程序存储器配置····················································82.4.9AT89S52的数据存储器配置····················································92.4.10AT89S52的中断简介····························································92.4.10.1中断的定义：······························································102.4.10.2中断允许控制······························································112.4.10.3中断优先级控制···························································122.4.11AT89S52定时/计数器简介····················································142.4.11.1T0和T1工作方式的控制················································152.4.11.2T0和T1工作状态的控制················································152.4.11.3T0和T1定时计数器的工作方式·······································162.4.11.4T2定时/计数器的控制····················································172.4.11.5T2定时/计数器模式的控制··············································182.4.11.6T2的工作方式······························································182.4.12AT89S52的串行口的简介·····················································202.4.12.1AT89S52串行口的结构·········