毕业论文 频率合成器的设计与分析.doc

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毕业论文 频率合成器的设计与分析,摘要频率合成是以一个或少量的高准确度和高稳定度的标准频率作为参考频率,由此导出多个或大量的输出频率,这些输出的准确度与稳定度与参考频率是一致的。在通信、雷达、测控、仪器表等电子系统中有广泛的应用,频率合成器有直接式频率合成器、直接数字式频率合成器及锁相频率合成器三种基本模式,前两种属于开环系统,因此是有频率转换时间短,...
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分类: 论文>通信/电子论文

内容介绍

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摘要


频率合成是以一个或少量的高准确度和高稳定度的标准频率作为参考频率,由此导出多个或大量的输出频率,这些输出的准确度与稳定度与参考频率是一致的。在通信、雷达、测控、仪器表等电子系统中有广泛的应用,
频率合成器有直接式频率合成器、直接数字式频率合成器及锁相频率合成器三种基本模式,前两种属于开环系统,因此是有频率转换时间短,分辨率较高等优点,而锁相频率合成器是一种闭环系统,其频率转换时间和分辨率均不如前两种好,但其结构简单,成本低。并且输出频率的准确度不逊色与前两种,因此采用锁相频率合成。

关键词: 锁相 频率合成器

















ABSTTRAC

Frequency synthesis is based on one or a small quantity of high accuracy and high stability of standard frequency as reference frequency ,Which lead to more or a lot of output frequency,The output accuracy and stability is consistent with the reference frequency.In communication,radar, monitoring,instrument table and other electronic systems have the widespread application .
Frequency synthesizer have three basic modes,which are direct type frequency synthesizer, direct digital frequency synthesizer and phase-locked frequency synthesizer.The first two are the open-loop system.Therefore, the advantages are that frequency conversion time is short and higher resolution.The phase-locked frequency synthesizer is a close-loop system,its frequency conversion time and resolution are lower than the first two ,however, it is not only simple structure ,low cost but also output frequency accuracy is not less than the first two.So we adopt phase-locked frequency synthesizer.
Keywords: phase-locked Frequency synthesizer











目录
第一章 绪论.........................................................1

1.1 引言.........................................................1

1.2 频率合成的技术指标...........................................1

1.3 频率合成器的类型.............................................3

1,4 DDS和PLL合成技术............................................8

第二章 锁相环.......................................................11

2.1 锁相环的基本工作原理.........................................11

2.2 锁相环的基本环路方程.........................................12

2.2.1 鉴相器................................................12

2.2.2 环路滤波器............................................14

2.2.3 压控振荡器............................................15

第三章 基于CD4046的锁相环频率合成器的设计.........................17

3.1 锁相环频率合成器的原理.......................................17

3.2 集成锁相环CD4046介绍........................................17

3.3 N分频的设计..................................................21

3.4 1KHz标准信号源的设计.........................................22

3.5 锁相环参数的设计.............................................24

第四章 Proteus软件介绍及其仿真.....................................25

4.1 Proteus概述................................................25

4.1.1 Proteus的功能特点..................................25

4.1.2 Proteus的电路功能仿真...............................26

4.2 Proteus仿真................................................26

第五章 焊接与调试..................................................31

第六章 实验总结....................................................33

致谢...............................................................35

参考文献...........................................................37