直接数字频率合成器实验报告.doc

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1、直接数字频率合成器实验报告院系：电子工程与光电技术学院专业：通信工程指导老师：蒋立平完成时间:2011.12.14摘要本实验利用QUARTUSII软件和SMARTSOPC试验箱设计一个信号发生器，该信号发生器能够产生正余弦波，三角波，锯齿波，方波等。并且可以对这些波形进行调频，调相，AM调制以及测频。要求最终信号频率和频率控制字、相位控制字在数码管上显示出来。除了这些基本功能，还实现了任意两个波形的组合输出，并且对任意两个不同的波形进行组合调相，即可以选择调相基准波形。关键字：信号发生器、AM调制、测频、调频调相AbstractAsignal

2、generatorisdesignedwiththeaidofQUARTUSIIsoftwareandSMARTSOPCinstrumentinthisexperiment.Itcangenerateafewsignalsasfollowed:sine(cosine),triangularwave,sawtoothwave,squarewave.AMmodulationisrealizedandthephaseandfrequencyofthesesignalscanbechanged,thechangeofwhichisshowedonNi

3、xielightwiththecurrentfrequency.Besidesthesebasicfunctions,thedesignalsorealizedacreativeonethattwoarbitrarywaveformscanbearrangedtobeshowedontheoscillographandthephaseofwhichisabletobechanged(wecanchooseanyonesignalasthebaseofPMsignal).Keywords:signalgenerator,AMmodulation

4、,frequencymeasure,FM,PM目录1.设计要求····················································31.方案论证············································32.各子模块设计原理····································6A.时钟信号发生电路··············································7B.频率控制字发生电路························

5、···················7C.相位累加器模块···············································8D.相位寄存器模块················································9E.波形存储器模块···············································9F.测频模块·····················································11G.显示模块···············

6、·····································13A.实现任意波形组合以及选择基准波形调相模块·····················15B.AM调制（调频与调幅）模块·····································16C.DDS总电路图·················································18A.示波器波形··································18B.调试、仿真、编译下载·····················

7、···21C.实验总结和感想······························22D.参考文献·····································221.设计要求：A.基本要求：1)用QuartusII软件和SmartSOPC实验箱实现DDS的设计;2)DDS中的波形存储器模块用Altera公司的Cyclone系列FPGA芯片中的ROM实现,ROM结构配置成4096×10类型;3)具体参数要求:频率控制字K取4位;基准频率fc=1MHz,由实验板上的系统时钟分频得到;4)系统具有清零和使能的功能;5)利用实验箱

8、上的D/A转换器件将ROM输出的数字信号转换为模拟信号,能够通过示波器观察到正弦波形;6)通过开关(实验箱上的Ki)输入DDS的频率和相位控制字,并能用示波器观察加