基于单片机及AD9850的正弦信号发生器设计说明书毕业设计(可编辑).doc

基于单片机及AD9850的正弦信号发生器设计说明书毕业设计 基于单片机的交流信号源的设计 范 鹏 兴 (陕理工机械工程学院机自专业 087班,陕西 汉中 723003) 指导教师:王长乾 [摘要] 本设计使用51单片机对DDS芯片进行控制,利用DDS造波的方法产生需要的正弦信号.用户可以根据需要对芯片设定一个频率值或相位值,通过单片机传输芯片控制字对芯片输出的频率和相位进行调节,达到用户所要求的信号。本设计采用模块化设计的方法,不同的模块为实现不同的功能而设计,总体由单片机控制协调工作。利用51单片机控制DDS芯片造波,具有如下优越性:1.造价低廉。51系列单片机应用广泛,价格低廉,比较容易购买,DDS芯片价格较单片机稍高,但与价格成百上千的成品信号发生器相比,本设计经济优势显著。2.电路简单。本设计利用单片机进行数字化控制,外围元件较少,仅需辅以少量的阻容元件用于电流电压匹配控制以及滤波电路既可。3.频率控制准确高效。数字化控制的最大优点即控制准确。本设计选用的DDS芯片内置32位高速数模转换器,分辨率高,响应快。 [关键词] 51单片机;DDS造波;频率; The Design of Sinusoidal Signal Generator Based on Singlechip Fan Pengxing Grade 08,Class 7,Major mechanical engineering,Mechanical engineering and automation Dept.,Shaanxi University of Technology,Hanzhong 723000,Shaanxi Tutor: Wang Changqian [Abstract]: The design use 51series’ singlechip to control DDS chip’s working. Using DDS method to produce sine signal. The user can set a frequency or phase value freely.To achieve the user request signal,the singlechip need sending a control word to DDS chip,which determines the frequency and phase values. This design uses the modular design method, different modules designed for different functions.Singlechip responsible for coordination of all work.The benefits of DDS method to produce sine signal as follows:1.low cost. The 51 series’singlechip’s application are range,so they have low price and are easy to purchase.The price of DDS chip is slightly higher than singlechip.but to compare with the commodity signal generator which values hundreds even thousands,the advantages of this design is obvious.2.Simple circuit..Benefits which digital control takes is Peripheral element is less.It’s only need a few capacitance and resistance element for crrent and voltage matching and filter.3. Frequency control is accurate and efficient. Frequency control is accurate and efficient.This design using DDS chip with 32 bit high speed D/A converter,which has a high resolution, fast response. [Key words]: 51 singlechip;DDS met