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1、摘要近年来随着计算机在社会领域的渗透,单片机的应用正在不断地走向深入,同时带动传统函数信号发生器日新月异的更新。单片机能产生高精度、快速变换频率、输出波形失真小的优先选用技术。函数信号发生器是各种测试和实验过程中不可缺少的工具,在通信、测量、雷达、控制、教学等领域应用十分广泛。不论是在生产、科研还是教学上,信号发生器都是电子工程师信号仿真实验的最佳工具,而且,信号发生器的设计方法多,设计技术也越来越先进。研究函数信号发生器的设计方法,克服传统方法的缺点,以更好的方法设计出比较复杂的调频、调幅功能
2、的信号发生器。本论文介绍的是一种用AT89C51单片机构成的波形发生器,可产生方波、三角波、正弦波、锯齿波等多种波形,波形的周期可用程序改变,并可根据需要选择单极性输出或双极性输出,具有线路简单、结构紧凑、性能优越等特点。文章给出了源代码,通过仿真测试,其性能指标达到了设计要求。单片机小系统负责用户的交互和系统控制,键盘用于频率的输入与波形的选择。LED显示当前所选信号的频率调整情况,而末级放大电路则对生成的信号进行适当的放大,以提高信号的振幅和强度。关键词:单片机,DAC,信号发生器,频率调节
3、,放大电路AbstractInrecentyears,withthecomputerinthesocialsectorpenetrationandMCUapplicationiscontinuously,whiledrivingtothedeepeningtraditionalfunctionsignalgeneratoronnewPEupdates.SCMcanproducehighprecision,fasttransformthefrequency,theoutputwaveformdis
4、tortionofpreferredselectiontechnology.Functionsignalgeneratorisallsortsoftestandexperimentprocesstheessentialtool,incommunication,measuring,radar,control,teachingfieldsusedwidely.Bothinproductionandscientificresearchorteaching,signalgeneratorareelect
5、ronicengineersignalsimulationexperiment,andthebesttool,signalgeneratordesignmethod,designtechnologyisbecomingmoreandmoreadvanced.Researchfunctionsignalgeneratordesignmethods,overcomeshortcomingsoftraditionalmethods,inordertobetterdesignedcomplexFM,at
6、tenuationfunctionsignalgenerator.ThisthesisintroducesaAT89C1single-chipcomputers.thewaveformgenerator,canproducesquare-wave,trianglewave,sinewave,sawtoothwaveetc.Variouswaveform,waveformcycleavailableprogramchange,andcanchooseaccordingtoneedsinglepol
7、arityoutputordualpolarityoutput,hasthelineissimple,compactstructure,superiorperformancecharacteristics.Thearticlepresentedthesourcecode,throughthesimulationtest,theperformanceindexesmeetthedesignrequirements.:singlechipprocessorsystemisresponsiblefor
8、theuserinteractionandsystemcontrol,thekeyboardforfrequencyofinputandwaveformchoice.LEDdisplaythecurrentselectedthesignalfrequencyadjustment,andfinalamplifiercircuitisgeneratedsignalproperamplifier,inordertoimprovethesignalamplitudeandstrength.Keyword