搜索
徐州工程学院毕业设计(论文)-I-图书分类号：密级：摘要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。随着我国经济和科技的发展，对相应的测试仪器和测试手段也提出了更高的要求，信号发生器己成为测试仪器中至关重要的一类。本文在探讨函数信号发生器几种实现方式的基础上，采用直接数字频率合成（DDS）技术实现函数信号发生器。在对直接数字频率合成（DDS）技术充分了解后，本文选择以Altera公司生产的FPGA芯片为核心，以硬件描述语言VerilogHDL为开发语言，设计实现了可以产生任意波形（以正弦波为例）和固定波形的（以方波和锯齿波为例）的函数信号发生器。文中详细阐述了直接数字频率合成（DDS）、波形产生以及调幅模块的设计，并给出了相应的仿真结果。本文最后给出了整个系统的仿真结果，即正弦波、方波、锯齿波的波形输出。实验表明，用现场可编程门阵列（FPGA）设计实现的采用直接数字频率合成（DDS）技术的函数信号发生器，克服了传统方法的局限，实现了信号发生器多波形输出以及方便调频、调幅的功能。关键词函数信号发生器；直接数字频率合成；现场可编程门阵列；VerilogHDL徐州工程学院毕业设计(论文)-II-徐州工程学院毕业设计(论文)-III-AbstractFunctionGeneratorisanindispensabletoolinaprocessofvarioustestsandexperiments.Itiswidelyusedincommunication,measurement,radar,control,teachingandotherfields.WiththedevelopmentofChina'seconomicandtechnological,thecorrespondingtestequipmentandtestmethodsarealsoputforwardhigherrequirements,andthesignalgeneratorhasbecomeavitaltestinstrument.Thearticleexaminestheseveralimplementationsofthefunctiongenerator.Andithasachievedthefunctiongeneratorwhichiscompletedbydirectdigitalfrequencysynthesis(DDS)technology.Throughunderstandingthedirectdigitalfrequencysynthesis(DDS)technology,thispaperchosetotheAlteraCorporations’FPGAchipsasthecoreofdesign.Thefunctiongeneratorwhichcanproducesine,squarewave,sawtoothwavewasdesigned.ItalsousedhardwaredescriptionlanguageVerilogHDLasdevelopmentlanguage.Thepaperdescribedthedesignofthemainmodule,suchasdirectdigitalsynthesizer(DDS),waveformgenerationandmodulationmodule.Andthecorrespondingsimulationresultswerealsopresented.Atlast,thesimulationresultsofthewholesystemwerepresented,thatis,sine,square,sawtoothwaveformhasbeencarriedout.ExperimentsshowthatthefunctiongeneratorbasedonFPGAanddirectdigitalfrequencysynthesis(DDS)technologyhasovercamethelimitationsoftraditionalmethodsandachievedasignalgeneratorwhichcangeneratemultiplewaveformsandhasfacilitateFM,AMfunction.KeywordsFunctionGenenratorDirectDigitalFreguencySynthesizerFPGAVerilogHDL徐州工程学院毕业设计(论文)-I-目录1绪论..............................................................................................................................................11.1背景及意义............................................................................................................................11.2波形发生器研究现状............................................................................................................11.2.1波形发生器的发展状况.................................................................................................11.2.2国外波形发生器产品介绍.............................................................................................21.3本设计的主要工作................................................................................................................22系统基本原理..............................................................................................................................42.1函数信号发生器的几种实现方式........................................................................................42.1.1程序控制输出方式.........................................................................................................42.1.2DMA输出方式...............................................................................................................42.1.3可变时钟计数器寻址方式.............................................................................................42.1.4直接数字频率合成方式.................................................................................................42.2频率合成器简介....................................................................................................................52.2.1频率合成技术概述.........................................................................................................52.2.2频率合成器主要指标.....................................................................................................62.3DDS原理...............................................................................................................................62.3.1相位累加器.....................................................................................................................72.3.2波形ROM.......................................................................................................................82.3.3DDS频率合成器优缺点................................................................................................82.4现场可编程门阵列(FPGA)...................................................................................................92.4.1FPGA简介......................................................................................................................92.4.2FPGA特点......................................................................................................................92.4.3FPGA工作状态............................................................................................................102.4.4FPGA的编程技术........................................................................................................102.4.5FPGA器件配置方式...............................................................................................