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正弦信号发生器

文档编号:ZD871 文档字数:14301,页数:40

摘要

信号发生器是一种常用的信号源，广泛应用于电子电路、自动控制和科学试验等领域。它是一种为电子测量和计量工作提供符合严格技术要求的电信号设备。因此，信号发生器和示波器、电压表、频率计等仪器一样是最普通、最基本的，也是应用最广泛的电子仪器之一，几乎所有的电参量的测量都需要用到信号发生器。
直接数字式频率合成技术DDS是新一代的频率合成技术，它采用数字控制信号的相位增量技术，具有频率分辨率高，频率切换快，频率切换时相位连续和相位噪声低以及全数字化易于集成等优点而被广泛采用。
本系统设计一个正弦信号发生器，使用凌阳公司的16位单片机SPCE061A，因其功耗低，超小型，低成本，功能完整，非常适用于便携式仪表和就地式显示控制仪表，在国内越来越受到用户的重视和广泛的应用。SPCE061A单片机功能强大,其片内含有八路十位A/D转换器和两路D/A转换器，该波形发生器运用单片机技术，通过巧妙的软件设计和简易的硬件电路，产生数字式的正弦波。信号频率，可通过键盘输入，并显示。与现有各类型波形发生器比较而言，产生的数字信号干扰小，输出稳定，可靠性高，特别是操作简单方便，人机界面友好，成本低，非常适合于物理实验室教学与实验使用。

关键字：正弦信号；DDS技术；SPCE061A

Abstract

Signal generator is a common source of the signal, widely used in electronic circuits, automatic control and scientific experiments, and other fields. It is a measurement of electronic measurement and work to meet stringent technical requirements of the signal equipment. Therefore, signal generators and oscilloscopes, voltage meter, such as the frequency of the same equipment is the most common and most basic is the most extensive application of electronic devices, almost all the parameters, the measurement will need to use signal generator.
Direct Digital Synthesis techniques DDS is the next generation of frequency synthesis technology, using digital control signals in the incremental phase, with high frequency resolution and fast switching frequency, frequency switching phase for phase noise and low As well as digital and easy to integrate the advantages that are widely used.
The system design of a sine wave generator, using the company's 16 Sunplus SCM SPCE061A, because of their low power consumption, ultra-small, low-cost, full-featured, very applicable to portable instrumentation and control instruments showed that the spot-in China has received increasing attention and users of a wide range of applications. SPCE061A SCM powerful, eight-way chip containing 10 A / D converter and two D / A converters, the waveform generators use SCM technology, through clever software design and simple hardware circuit, a The digital sine wave. Signal frequency, through the keyboard input, and display. And various types of existing waveform generator comparison, the small number of signal interference, output stability, high reliability, in particular the operation of simple, friendly interface and low cost, very suitable for teaching and experimental physics laboratory use.

Keyword: sine signal；DDS technology；SPCE061A.

目录
第1章绪论........................................................1
1.1 课题背景....................................................1
1.2 国内外波形发生器的发展现状 ................................1
1.2.1 波形发生器的发展状况 ....................................1
1.2.2 国内外波形发生器产品比较 ................................3
1.2.3 研究波形发生器的目的及意义................................3
第2章 DDS理论介绍 ..............................................5
2.1 频率合成技术 ..............................................5
2.1.1 频率合成技术的发展及分类 ............................ .....5
2.1.2 频率合成技术的技术指标....................................6
2.2 DDS的原理和结构 ...........................................6
2.2.1 DDS的原理 ..............................................6
2.2.2 DDS的基本结构 ...........................................9
第3章设计方案论证 .............................................12
3.1 直接利用单片机实现方案 ...................................12
3.2 利用单片集成芯片实现方案 ...............................12
3.3 采用高性能DDS单片电路的解决方案 ......................13
3.4 三种实现方案的比较 ....................................13
第4章 SPCE061A单片机简介 ......................................14
4．1 SPCE061A单片机概述 ......................................14
4.2 SPCE061A 结构 .............................................15
4.3 61板接口说明 .............................................17
4.4 信号发生的原理 ..........................................18
4.4.1 信号发生电路原理 ...................................18
4.4.2 信号分析与计算 ......................................19
第五章系统硬件电路 .............................................20
5.1 系统硬件...................................................20
5.2按键电路...................................................20
第六章系统软件设计.............................................. 21
6.1 程序设计语言与软件开发环境 ............................... 22
6.2 输入识别部分 .......................................22
6．3 主程序流程图 .........................................23
6．4　分块程序流程..............................................24
6．4．1按键控制部份 ..........................................24
6．5 正弦波形的形成 ..........................................25
第7章设计总结....................................................29
致谢..............................................................30
参考文献..........................................................31
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