# 无线电调幅发射机仿真与分析

（保密论文在解密后遵守此规定）

Abstract

The radio amplitude modulation transmitter is widely used in various radio communication systems, and it is widely used in the medium and short wave communications broadcasting field..

Designed in this paper is a summary of AM radio transmitter design, and make the system contains basic unit of high frequency oscillator, modulator and amplifier. Then simulation is carried on to each part. The use of Multisim software design and analysis of the Radio AM transmitter circuit. After through understanding of classroom learning and all kinds of data, with Multisim software are designed by the vibration level, amplifier, audio amplifier and amplitude of each module circuit, and then run the circuit found that the initial design of the circuit and some can not meet the requirements. The results with the expected difference is big, through access to information and consult instructors, each module design was modified several times, and finally completed the circuit design of each module, and simulation results finally, each part of the circuit cascade and test. After the design simulation, finish the graduation thesis seriously

1.1课题的意义 (5)

1.2设计内容与要求 (5)

1.3无线电调幅发射机的系统设计 (6)

2.1震荡模块 (1)

2.2高频放大模块 (4)

2.3音频放大模块 (6)

2.4 振幅调制模块 (7)

3.1 整体电路 (10)

3.2 调试并仿真 (11)

1.1课题的意义

1.2设计内容与要求

●中心频率： f=6 MHz

●调幅波功率： P0max ≥200mW

●调制系数：

1.3无线电调幅发射机的系统设计

2.1震荡模块

26f m CQ Y g I mV

== ，我们可以在0.15～0.5区间选择反馈系数。 输出电路的总电容：

234545233424

C C C C C C C C C C C C C =+≈+++ 振荡频率为：

f=≈

2.2高频放大模块

f工作信号的频率进行放大，对于其他的信号进选择频率并进行滤波，只对f=

2.3音频放大模块

10mv，频率为1KHz，使用3554BM运算放大器进行功率放大。示波器的A口接的是初始音频信号，示波器的B口接的是放大之后的低频信号。

2.4 振幅调制模块

3.2 调试并仿真

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