小功率调幅发射机的设计_毕业设计论文 下载本文

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学校代码: 11059 学 号:0905076042

Hefei University

毕业设计(论文)

BACHELOR DISSERTATION

论文题目: 小功率调幅发射机的设计 学位类别: 工 学 学 士 年级专业(班级): 09通信工程(2)班 完成时间: 2013年5月29日

小功率调幅发射机设计

中 文 摘 要

本课题是关于小功率调幅发射机的工作原理、分析制作方法及其安装调试。

本课题包含主振级、缓冲级、振幅调制极、功率放大级、话筒和语音放大级,在调幅发射机中,话筒将话音信号转换为音频电信号,音频信号经放大后对载波进行调制产生调幅波,通过天线向外发射调幅电磁波,用调幅收音机即可以接收到清晰的话音。通过此次毕业设计我们加深并巩固了对小功率调幅发射机工作原理和非线性电子线路的进一步理解。掌握了一般电子产品的研制过程,学习测试高频信号的幅度和功率,掌握基本的试验技能(包括元器件的选择,电路的焊接)提高了解决实际问题的能力。

文中系统的设计了振荡器、音频放大器、振幅调制器和谐振功率放大器等系统单元电路,通过仿真软件Multisim,进行仿真并优化了系统电路。实现了各单元电路的功能。

关键词:小功率调幅发射机 振荡器 功率放大器 调制器

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Design Of Low Power AM Transmitter

Abstract

This topic is about the low-power AM transmitter works, analyze production methods and installation.

This topic contains the primary vibration level, buffer level, amplitude modulation electrode, the power amplification stage, a microphone and voice amplification stage, in the AM transmitter, the microphone voice signals into audio signals, the audio signal is amplified and modulates the carrier generated modulated wave, amplitude modulated electromagnetic waves emitted by the antenna outwards, with the AM radio that can receive clear voice. With this graduation we deepen and consolidate the work on the principle of low-power AM transmitter and a further understanding of nonlinear electronic circuits. Mastered the general electronic product development process, learning test signal amplitude and high frequency power, master basic skills tests (including the choice of components, circuit welding) improves the ability to solve practical problems.

In this paper the design of the system oscillator, audio amplifiers, amplitude modulator and power amplifier system unit resonant circuit simulation software Multisim, simulation and optimization of the system circuit. Achieve the function of each unit circuit.

Key words: low-power AM transmitter oscillator frequency power amplifier modulator

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