基于单片机的信号发生器设计

论文总字数：14504字

摘 要

信号发生器是一种能提供各种频率、波形和输出电平电信号的设备。在测量各种电信系统或电信设备的振幅特性、频率特性、传输特性及其它电参数时，以及测量元器件的特性与参数时，用作测试的信号源或激励源。在当今的数字时代，包括信号发生器的经典模拟电路已经逐渐从人们搬走，通过简单的电路，多功能,低功耗的数字电路所取代。在未来，越来越多的数字信号发生器将在各个科学领域和工程实践，更多的方便了人们的日常生活。

本次毕业设计我准备利用一种以AT89C51单片机作为核心，加上使用DAC0832来进行数模转换产生需要的信号源，并且要能够调节这些得到的信号源。本次论文将简单介绍AT89C51和DAC0832数字 - 模拟转换器的使用情况，以及相关的运算放大器，电源，总线和其它模块的结构和原理。文中主要讲解了如何使用单片机控制DAC（数模转换器）获得相应的信号，并使用相应的硬件加上软件编程来最终实现设计要求，既可产生三种不同波形且信号频率可自行调整。

关键词：AT89C51；单片机；DAC；数字波形合成；低频信号发生器

Design of function signal Generator based on single Chip Microcomputer

Abstract

The signal generator is a device that can provide various frequency, waveform, and output level electrical signals. When measuring the amplitude characteristics, frequency characteristics, transmission characteristics and other electrical parameters of various telecommunication systems or telecommunication devices, and measuring the characteristics and parameters of the components, a signal source or an excitation source for testing is used. In today's digital age, the classic analog circuit, which includes the signal generator, has been gradually removed from people and replaced by a simple circuit, a multi-function, low-power digital circuit. In the future, more and more digital signal generators will be in various scientific fields and engineering practice, more convenient for people's daily life.

This graduation project I intend to use a AT89C51 single-chip microcomputer as the core, plus the use of DAC0832 for digital-to-analog conversion to generate the required signal sources, and to be able to adjust these obtained signal sources. This paper briefly introduces the use of AT89C51 and DAC0832 digital-to-analog converters, as well as the structure and principle of operational amplifiers, power supplies, buses and other modules. This paper mainly explains how to use single chip microcomputer to control DAC (Digital to Analog Converter) to obtain the corresponding signal, and to use the corresponding hardware and software programming to finally realize the design requirements. Three different waveforms can be generated and the signal frequency can be adjusted by itself.

Keywords:AT89C51; single Chip Microcomputer; DAC; Digital Waveform Synthesis; low Frequency signal Generator

目录

摘要 I

Abstract II

第一章 绪 论 1

1.1 课题背景 1

1.2 研究目的及意义 1

1.3 单片机概述 1

1.4 信号发生器的分类 1

第二章 选择与设计方案..................................................................................................................................2

2.1 方案的比较.............................................................................................................................................2

2.2 设计原理 2

2.3 设计思路 3

2.4 设计功能 3

第三章 硬件设计 4

3.1 硬件原理框图 4

3.2 主控电路 4

3.3 数/模转换电路 5

3.4 设计波形产生的模块 6

3.5 键盘显示模块的设计 7

3.6 时钟电路 8

3.7 低通滤波电路及运算放大电路（3-9） 8

3.8 显示电路 9

3.9 程序流程图 9

3.10波形产生的模块及原理........................................................................................................................9

第四章安装调试及测量数据分析 11

4.1 编程软件 11

4.2 仿真软件 11

4.3 调试过程 11

4.4 调试结果 13

第五章 小结 14

参考文献： 15

第一章 绪 论

1.1 课题背景

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