毕业设计基于DDS函数信号发生器设计方案.doc

摘 要 直接数字频率合成(简称DDS)是一种以固定的精确时钟源为基准，利用数字处理模块产生频率和相位均可调的输出信号的技术。随着超大规模集成电路和微电子技术的发展，现代高性能、高集成度和小体积的DDS产品正快速取代传统的模拟信号频率合成技术，成为了这类问题新的解决方案。用单片直接数字频率合成（DDS），产生稳幅正弦波。89C51与外部电路的接口，单片微机控制系统的硬件结构及软件设计框图。整个系统电路简单，功能强大，可扩展性强。Direct Digital Synthesis (DDS) is a constant source of accurate clock as the base, using digital processing module can be generated frequency and phase for the output signal technology. With the ultra-large-scale integrated circuits and micro-electronics technology, modern high-performance, high level of integration and small size of the DDS products are rapidly replacing traditional analog frequency synthesis technology, such as the issue of new solutions. This paper introduced one kind of multi-signal generator based on DDS chip EP1K30 and derectly controled by MCU 89C51,and a steady increase sine and square. This article focuses on the 89 C51 interface with the outside of the circuit, single-chip computer control system hardware and software design structure diagram. The whole system circuit simple, powerful, scalable and strong. First, this thesis introducts the background and design of main mission of the DDS function signal occurrence machine of creation. Then introduct direct numeral the frequency synthesize(DDS) a technique and it application, machine happen according to the DDS signal of put forward of system project, total structure and its characteristics.Then introduction design in the process main chip for use and its function, hardware electric circuit of design.After detailed related structure and its principle, each mold piece procedure of FPGA/CPLD and it imitate true result, crest layer procedure and crest see diagram.The end aim at a design process in the problem the other party case meet put forward further of improvement and summary. [Keyword] Micro Controller Unit Flow Chart Hardware Circuit Field Programmable Gate Array 目 录 摘 要 1 Abstract 2 绪 论 5 一、课题背景 5 二、DDS函数信号发生器概述 5 三、课题的主要任务 6 第一章 基于DDS函数信号发生器设计方案 8 一、基于DDS信号发生器的系统