基于Multisim的调频通信系统仿真

LANZHOU UNIVERSITY OF TECHNOLOGY

题目 基于Multisim的调频通信系统仿真

学生姓名 姬晓义

学 号 09250113

专业班级 通信工程一班

指导教师 何继爱 王璐

学 院 计算机与通信学院

答辩日期 2013

年6月13日

兰州理工大学毕业设计

基于Multisim的调频通信系统仿真

Simulation of frequency modulation communication system based on Multisim

姬晓义（Ji Xiaoyi）

09250113

兰州理工大学毕业设计

摘要

调频通信系统设计中系统的介绍了发射系统和接收系统设计方案，特别是发射系统和接收系统的基本功能，频率选择，功放等，最后定性、定量分析这些电路性能。这些电路包括了发射系统和接收系统中的变容二极管直接调频电路、射极跟随器、放大器、高频小信号放大器、本振电路、混频电路、功放电路、鉴频器、低频放大器等。利用Multisim仿真软件将各个电路进行仿真，最后，把各个电路进行级联，并进行修改，修改之后，逐级进行调试仿真，得出最终仿真结果图。

设计的基本目的是：通过理论和实践学习，使我们了解各个电路工作处于高频时的工作原理，特性参数及微变等效电路等，掌握高频单元电路的线路组成、基本工作原理、分析方法、技术要求及典型集成电路的实际应用，并且具备一定的理论水平和足够的实践技能，为进一步学习通讯技术的专业知识和职业技能打下基础。

关键词： 调频；发射系统；接收系统；Multisim 仿真；电路分析

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兰州理工大学毕业设计

Abstract

Design of FM communication system introduced the system of emission and receiving system design scheme, Especially the basic function of emission and receiving system, frequency selection , Power amplifier ,The circuit performance analysis and qualitative, quantitative. The circuit includes a emission system and receiving system in Varactor diode direct FM,emitter follower, amplifier, High frequency small signal amplifier, The oscillator circuit , mixer circuit, The power amplifier circuit, frequency detector and low-frequency amplifier . Each circuit is simulated with Multisim simulation software, Finally, all the circuits are cascaded, And modify, After the modification, Step debugging simulation, The final simulation results figure.

The basic design of this finish school are: Through the combination of theory and practice, so we know when each circuit at high working principle, characteristics and micro-dependent equivalent circuit parameters, frequency control circuit of the line unit composition, the basic working principle methods, technical requirements, and some typical IC, and have a certain theoretical level and enough of the practical skills, communication technologies for the further study of expertise and professional skills basis.

Key words :frequency modulation;emission system ;receiving system ;multisim smulation;circuit analysi

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兰州理工大学毕业设计

目录

第1章 绪论 ................................................................................................................................ 1

1.1 研究背景 ....................................................................................................................... 1 1.2 研究现状 ....................................................................................................................... 1 1.3 设计内容 ....................................................................................................................... 2 第2章 基本原理 ........................................................................................................................ 4

2.1 引言 ............................................................................................................................... 4 2.2 开发平台简介 ............................................................................................................... 5 2.3 基本理论 ....................................................................................................................... 6 第3章 调频发射系统电路仿真 .............................................................................................. 14

3.1 振荡级 ......................................................................................................................... 14 3.2 变容二极管调频 ......................................................................................................... 15 3.3 缓冲级 ......................................................................................................................... 18 3.4 功率输出级 ................................................................................................................. 19 3.5 调频发射系统整机电路图级联 ................................................................................. 20 第4章 调频接收系统电路仿真 .............................................................................................. 22

4.1 高频放大电路 ............................................................................................................. 22 4.2 本振电路 ..................................................................................................................... 23 4.3 混频器 ......................................................................................................................... 24 4.4 中频放大电路 ............................................................................................................. 25 4.5 鉴频电路 ..................................................................................................................... 26 4.6 低频放大电路 ............................................................................................................. 27 4.7 调频接收系统整机电路图级联 ................................................................................. 28 总结 ............................................................................................................................................ 31 参考文献 .................................................................................................................................... 32 附录 ............................................................................................................................................ 33

1 发射整机电路图 ............................................................................................................ 33 2 接收整机电路图 ............................................................................................................ 34 3 外文翻译 ........................................................................................................................ 35 致谢 ............................................................................................................................................ 53

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