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新疆师范大学2013届本科毕业设计

目 录

1 锁相环简介 ........................................................ 1

1.1 引言 ........................................................ 1 1.2 锁相环的结构 ................................................ 1 2 锁相环芯片简介 .................................................... 2

2.1 NE564介绍 ................................................... 2 2.2 CD4046介绍 .................................................. 3 3 FSK简介 .......................................................... 5

3.1 FSK基本概念与特点 ........................................... 5 3.2 FSK的发展及应用前景 ......................................... 7 4 利用锁相环芯片实现FSK信号的调制 .................................. 7

4.1 FSK信号调制的基本原理 ....................................... 7 4.2 利用NE564实现FSK信号调制电路的设计 ........................ 8 4.3 利用CD4046实现FSK信号调制电路的设计 ....................... 8 5 利用锁相环芯片实现FSK信号的解调 ................................. 10 6 实验结果分析 ..................................................... 11

6.1 利用锁相环芯片实现FSK信号调制和解调的结果分析 ............. 11 6.2 课题的主要研究工作及意义 ................................... 12 参考文献 ........................................................... 14 致谢 ............................................................... 15

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新疆师范大学2013届本科毕业设计

利用锁相环芯片实现FSK信号的调制与解调电路的设计

摘要：频移键控（FSK）操作方法简单，易于实现；在解调的过程中不须恢复本地载波，也可进行异步传输；并且抗噪声和抗衰落性能也都较强。因此，频移键控（FSK）的调制与解调技术在通信行业中得到了广泛地应用，且主要适用于低、中速数据的传输。本文主要介绍锁相环芯片NE564、CD4046和FSK信号的基本特点、工作原理和用途，并详细的阐述了利用锁相环芯片NE564和CD4046实现FSK信号的调制与解调工作的基本原理和主要设计过程。在技术方面，主要介绍FSK调制与解调的相关原理和基本技术。最后对整个实验设计过程进行总结分析，并深入探讨了课题的主要研究工作及意义，加深了对数字移频键控的调制与解调方法的理解；更加深入的学习了锁相环的设计原理，并加强了对锁相环的应用。

关键词：锁相环；NE564；CD4046；FSK；调制；解调

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新疆师范大学2013届本科毕业设计

Using PLL Chip to Achieve FSK Signal Modulation and

Demodulation Circuit Design

Abstract:Frequency shift keying (FSK) operation method is simple,easy to implement;In the process of demodulation,need not to restore the local carrier can also be used for asynchronous transmission;And anti noise and fading resistance is strong.Therefore,frequency shift keying (FSK) modulation and demodulation technology has been widely used in the communications industry,and is mainly suitable for low and medium speed data transmission.NE564 PLL chip were introduced in this paper,CD4046 and the basic characteristics of FSK signal,the working principle and purpose,and expounds in detail the use of NE564 PLL chip CD4046 and realize the basic principle of FSK signal modulation and demodulation of the work and the main design process.In terms of technology,mainly introduces the FSK modulation and demodulation principle and basic technology.Finally to summarize the whole process of design of experiment is analyzed,and discussed the main research work and significance of topics,deepened the FSK digital modulation and demodulation ways of understanding;More in-depth study,the design principle of phase-locked loop,and strengthen the application of phase-locked loop.

Key words:Phase-locked loop;NE564;CD4046;FSK;Modulation;Demodulation

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