“美亚光电“杯安徽省首届大学生电子设计竞赛设计报告书作品名称：参赛学校：参赛成员：任意波形发生器（A题）合肥学院周海波刘亚军高超任意波形发生器摘要本系统的设计综合了EDA技术和单片机技术的二者之所长，实现了二者在性能、功能以及资源上的良好结合，整个系统可简略分为波形产生模块、单片机控制模块、LCD显示、键盘、幅度控制模块等功能模块。
采用直接数字频率合成（DDFS）技术，通过软件对其波形进行控制，实现多种波形的输出及组合。
该系统可实现的频率范围宽、幅度和频率精度高，并且实现电路简单，结构较优，利用液晶显示屏实现了良好的中文人机交互界面。
Abstract :The design of this system synthesized the advantages of EDA technology and Microcontroller technology ,and it ……The whole system is made up of the part of wave producer ,the controller of microcontroller ,the display part of LCD ,the keyboard and the controller of range and frequency .The system adopts the method of Direct Digital Frequency Synthesis (DDFS) , whose wave is controlled through software .A few kinds of waves and their combinations can be produced .We can get wide and accurate frequency and high range .At the same time ,this system has less sample circuit and better structure .The LCD that we used can provide us very clear menu when we communicate with the machine.目录一、方案论证与比较.......................................................................................................... - 4 -1．波形产生及频率合成模块.................................................................................... - 4 - 2．幅度控制模块........................................................................................................ - 5 - 3．显示模块................................................................................................................ - 5 - 4．波形存储模块........................................................................................................ - 6 - 二、原理分析...................................................................................................................... - 6 -1．DDS原理............................................................................................................... - 6 - 2．基本算法................................................................................................................ - 7 - 3．误差分析................................................................................................................ - 7 - 4．DDFS的特点......................................................................................................... - 8 -三、系统设计...................................................................................................................... - 8 -四、方案实现.................................................................................................................... - 10 -1．波形产生.............................................................................................................. - 10 - 2．频率控制.............................................................................................................. - 11 - 3．幅度控制.............................................................................................................. - 13 - 4．液晶显示、键盘输入.......................................................................................... - 13 - 5．波形存储.............................................................................................................. - 13 - 6．功率放大电路...................................................................................................... - 14 - 五、软件系统设计............................................................................................................ - 15 -程序设计流程图........................................................................................................ - 15 - 六、结果测量及分析........................................................................................................ - 16 -1．基本波形测试...................................................................................................... - 16 - 2．波形编辑测试...................................................................................................... - 17 - 3．波形存储测试...................................................................................................... - 17 -七、功能实现.................................................................................................................... - 17 -八、总结............................................................................................................................ - 18 -一、方案论证与比较1．波形产生及频率合成模块方案1：采用传统的模拟振荡电路的方法。
如产生正弦波可采用模拟分立元件RC 或LC 振荡器，但其产生的信号的频率精度低，稳定度和抗干扰能力差，成本也比较高，外围电路复杂，且易受外界干扰，硬件调试困难，不便程控。
而且对于题目发挥部分所要求的最高频率200kHz的要求，不容易满足，实现的性能指标不理想。
方案2：采用专用集成芯片。
专用集成波形发生芯片ICL8038能够产生方波、正弦波、三角波等多种常规波形，频率变化范围可达0.01Hz——300kHz，占空比达2%——98%，该芯片具有良好的性能，与外围电路配合调试后可以达到本题目的要求。