基于DDS技术的三相信号发生器的设计(终稿).docx

毕业设计（论文）基于DDS技术的三相信号发生器设计系 别自动化工程系专 业自动化班级学号5060408学生姓名刘少华指导教师任良超2010年6月16日基于DDS技术的三相信号发生器设计摘 要直接数字频率合成( DDS )是一种新型的频率合成方法。直接数字频率合成器是一种全数字化的频率合成器，由相位累加器、波形查找表、数模转换器和低通滤波器构成。DDS技术具有频率分辨率高、频率切换速度快、频率切换时相位连续等优点。随着数字集成电路和微电子技术的发展，DDS技术日益显出它的优越性。本文主要讨论了直接数字频率合成技术及其应用。以一个三相信号发生器的设计实现为例，对直接数字频率合成技术进行了深入的研究。本文首先介绍了频率合成技术的发展历史以及发展现状；然后分析了DDS的数学原理、结构、特点以及频谱特性；接着阐述了基于DDS技术的三相信号发生器的系统设计方案，并详细介绍了基于FPGA和单片机平台的系统硬件、软件设计的设计方法，实现了正弦波、三角波、矩形波、调频波以及任意波信号的输出；最后，对系统的性能指标进行了分析，并提出改进意见。关键词：直接数字频率合成，FPGA，单片机Three-phase Signal Generator Based on Direct Digital Frequency Synthesis TechnologyAuthor: Liu shaohuaTutor: Ren liangchaoAbstractThe Direct Digital Frequency Synthesis (DDS) is a kind of new frequency synthesis method. The direct digital frequency synthesizer is a kind of fully digitized frequency synthesizer, which consists of the phase accumulator, the waveform look-up table, the digital to analog converter, and the band-pass filter. It is of high frequency resolution, fast frequency switching speed, the ability to switch frequencies while maintaining constant phase. With the development of digital integrated circuits and microelectronic techniques, DDS exhibits its advantages day by day.This dissertation discusses direct digital frequency synthesis technology and its applications. Through the design and realization of three-phase signal generator, this thesis accomplishes an in-depth study of the direct digital frequency synthesis technology. Firstly, the paper introduces the development of frequency synthesis techniques. Secondly, the paper analyzes the mathematical principle, structure, characteristics and spectral properties of DDS. Then it gives a system design plan of three-phase signal generator based on DDS technology, and describes the methods of hardware and software design of the platform based on FPGA and microcontroller system in detail. Finally, the paper analyzes the system performance, and suggests improvements.Keywords: Direct Digital Frequency Synthesis, Field