抑制载波双边带调幅电路的设计

通信工程论文编号:TX367  论文字数:9787,页数:24

目录

摘要 Ⅰ
ABSTRACT Ⅱ
第1章 引言 1
 1.1 背景 1
1.2 研究内容 1
第2章 调制技术 3
2.1 调制概述 3
2.1.1 调制的定义 3
2.1.2 调制的目的 3
2.2 调制的分类 4
2.2.1 模拟调制 4
2.2.2 数字调制 5
第3章 抑制载波双边带调制的设计 7
3.1 AM调制及DSB-SC原理 7
3.2 中频调制模块设计原理 8
3.2.1 中频调制电路组成原理图 8
3.2.2 中频调制器模块电路测试点 11
3.2.3 MC1496内部结构及原理 11
3.3 调制模块其它芯片 12
3.3.1 芯片LM358 12
3.3.2 芯片HD74LS04P 12
3.3.3 芯片DM74LS74AN 12
第4章 中频解调模块PCB板的制作 14
4.1 Protel99SE概述 14
4.1.1绘制原理图的工作流程 14
4.2 电路板的焊接及调试 14
4.3 实物图及调试波形 15
第5章 结束语 18
致谢 19
参考文献 20

摘要

 众所周知，通信在人类社会中起着极为重要的作用，随着社会的发展，相互交换传递的信息种类越来越多，量越来越大，速度要求越来越高。从而对通信的要求也越来越高，调制在通信系统中有十分重要的作用。通过调制，不仅可以进行频谱搬移，把调制信号的频谱搬移到所希望的位置上，从而将调制信号转换成适合于传播的已调信号，而且它对系统的传输有效性和传输的可靠性有着很大的影响，调制方式往往决定了一个通信系统的性能。
 本文介绍了调制的概念，作用及分类。分析调制的工作原理，对调制模块进行系统的分析，其中重点介绍了与课题相关的DSB-SC调制模块的设计与实现。
 
关键词：调制，解调，DSB-SC调制

ABSTRACT

 As we all know, communication plays an extremely important role in human society, along with social development, mutual exchange of message types, more and more increasing volume and speed have become increasingly demanding. Thus the requirements for communications have become more sophisticated, modulation in communication systems are a very important role.
 Through the modulation spectrum can be removed not only the modulation signal spectrum move to the desired position, which will convert the modulated signal suitable for transmission of signals have been transferred, and the effectiveness of its transmission system and transmission reliability of a a great impact, often determines the modulation of a communication system performance.
 This paper introduces the concept of modulation, the role and classification. Analysis of the working principle of modulation, the modulation system analysis module, which focuses on issues related with the DSB-SC modulation of the Design and Implementation of modules.Key words: modulation, Demodulation, DSB-SC modulation