摘要本设计采用单片机控制DDS芯片，利用DDS产生波形的方法产生正弦信号。根据用户需求设定芯片，从而达到相应频率或相位值。本设计采用模块化设计方法，以达到用户所要求的各种功能。单片机是整个设计的关键部分，它可以协调整个设计。利用单片机控制DDS芯片的波形，具有以下优点：1、低成本。单片机应用广泛，价格便宜，易于购买，虽然单片机控制DDS芯片价格略高，但相比成千上万的信号发生器成品，具有经济优势。2、电路简单。对单片机数字控制使用的设计，外围元件少，只需补充少量的阻容元件，使得电流和电压的控制和滤波电路可以匹配。3、频率控制是准确有效的。数字化控制的最大优点是精确控制。本设计采用DDS芯片，它包含32位高速模数转换器，分辨率高，响应速度快。23282
关键词 单片机 DDS芯片 高速模数转换器
毕业设计说明书（毕业论文）外文摘要
Title The Design of Sinusoidal Signal Generator
Abstract
This design adopts single-chip microcomputer control chip DDS, using DDS waveform generating sine signal. The user can according to need, set the corresponding frequency or phase values of the chip, and the single chip microcomputer chip control word to change the chip output frequency and phase adjustment, in order to get the signal of user needs. This design uses the modular design method, the design of various modules to achieve different functions, is composed of a single chip computer control the overall coordination. SCM control DDS chip waveform, has the following advantages: low cost 1. SCM application widely, cheap price, easy to buy, although the single-chip microcomputer to control DDS chip price slightly high, but finished signal generator compared to tens of thousands of, has economic advantages. 2. simple circuit. To control the use of single-chip design of digital, less peripheral elements, only adding a small amount of the resistive and capacitive components, so that the control and filter circuit, current and voltage can be matched. 3. the frequency control is accurate and effective. The biggest advantage of digital control is the precise control of. This design uses DDS chip, it contains a 32 bit high-speed analog-to-digital converter, high resolution, fast response speed.
Keywords SCM DDS Chip High speed analog-to-digital converter
目 次
1 引言 1
1.1 课题背景 1
1.2 信号发生器的发展 1
1.3 设计任务和要求 2
2 方案选择及工作原理 2
2.1 方案设计 2
2.2 DDS结构 3
2.3 DDS数学原理 5
3 总体方案设计 8
3.1 系统设计原理 8
3.2 系统设计框图 8
4 系统硬件模块的组成 8
4.1 键盘控制模块 8
4.2 单片机控制模块 9
4.3 AD9850与单片机链接模块 13
4.4 LCD显示模块 18
4.5 滤波电路设计 21
4.6 放大电路 22
4.7 硬件调试 23
5 软件设计与调试 24
5.1 程序流程图 24
5.2 软件调试 25
6 测量结果与分析 25
6.1 输出频率稳定测试 25
6.2 输出电压幅度测试 26 单片机DDS芯片正弦信号发生器的设计+电路图+源程序:http://www.751com.cn/tongxin/lunwen_16280.html