1、浙江科技学院信息与电子工程学院 2013 届本科毕业设计(论文) I 摘要 本文首先介绍了信号发生器的发展以及直接数字频率合成技术 (DDS)的现状和发展趋势,然后 介绍了 DDS 的原理结构及其主要构成部分。 再根据系统的要求,比较 合理地采用了 DDS 技术 , 以 单片机 AT89S52 和 AD9850 芯片为核心 , 设计了一种结构简单性能优良的信号发生器 。最后 详细分析了该信号发生器的系统结构 ,软硬件设计和具体电路实现 。 信号发生器的硬件部分包括三个模块 ,分别是单片机主 控制模块 , DDS 模块和信号频率显示 模块 。软件部分主要开 发基于单片机AT89S52 的数据处理
2、和控制程序 , 以及信号发生器的外部通信程序 。 最 终 完成实验电路板的制作 , 并通过电路板的调试 , 实现 电路工作正常 。 根据系统的最终测试结果可知该信号发生器 具有输出信号波形 精度高 , 频带宽等特点 。 关键词: 信号发生器; DDS; AT98S52; AD9850; 频率; 浙江科技学院信息与电子工程学院 2013 届本科毕业设计(论文) II ABSTRACT This article describes the development of the signal generator, the status and development trends of direct
3、 digital frequency synthesis (DDS) technology at first, then introduces the principle of DDS structure and its main components. According to system requirements, more rational use of DDS technology, single-chip AT89S52 and AD9850 chip as the core, has designed a simple structure and excellent perfor
4、mance of the signal generator. Finally, there is a detailed analysis of the signal generator system architecture, hardware and software design and specific circuit implementation. The hardware portion of the signal generator consists of three modules, namely, single-chip main control module, DDS mod
5、ule and signal frequency display module. Some of the major software development based on MCU AT89S52 data processing and control procedures, as well as external communication signal generator program. Completing the pilot circuit board production, and through the debug board to realize the circuit is working properly. According to the results of final test, the system shows that the output signal waveform signal generator has high accuracy, bandwidth and other characteristics. Keywords: Signal Generator; DDS; AT98S52; AD9850; Frequency