基于DDS的信号发生器的设计姓名：专业：学号：摘要在信号发生器的设计中,传统的用分立元件或通用数字电路元件设计电子线路的方法设计周期长,花费大,可移植性差。本设计是用直接数字频率合成器(DDS),设计出两个相互正交的信号，该信号发生器输出信号的频率范围为：0-400MHz，频率分辨率：0.232Hz，频率误差范围:-2%～2%，相位差的误差<4°。与传统的频率合成方法相比，DDS合成信号具有频率切换时间短、频率分辨率高、相位变化连续等诸多优点。使用单片机灵活的控制能力与FPGA器件的高性能、高集成度相结合，可以克服传统DDS设计中的缺乏，从而设计开发出性能优良的DDS系统。关键词：单片机，直接数字频率合成，可编程逻辑器件AbstractInthedesigningofthesignalgenerator,thetraditionalmethod,whichdesignselectroniccircuitsusingdiscretecomponentsorgeneraldigitalcircuitscomponents,takesalongtimewithhighcost,what’smore,thetransplantingabilityofitisunsatisfactory.Inthisdesign,thecircuitisdesignedthedesigningofDDS.Itsoutputfrequencyrangeis0to400MHz,theresolutionis0.232HZandzheerrorisbitween-2%and2%.Comparedwithtraditionalmethodsoffrequencysynthesizing,directdigitalfrequencysynthesizing(DDS)haslotsofadvantages,suchasshorttimeofquickfrequencyexchanging,highfrequencyresolution,continuousphasechanging,etc.Micro-controlunithasischaracterizedby.ManydrawbackscanbeovercomeandagoodDDSsystemwithgoodperformancecanbedevelopedaftercombiningtheflexiblecontrolcapabilityofmicro-controlunitwithhighperformanceandintegrationoftheFPGAdevicesinthesamesystem.Keywords:MCU,DDS，FPGA目录第一章绪言...............................................................11.1课题背景...........................................................11.2课题研究的目的和意义...............................................11.3国内外的研究状况...................................................21.3.1波形发生器的开展状况..............................................21.3.2国内外波形发生器产品比较.........................................31.3.3本课题在国内外的研究现状........................................4第二章信号发生器的方案设计.................................................
