150MHz频段窄带调频无线接收机

论文编号:JD081    附开题报告,字数:11973,页数:27

摘要
本设计是由输入调谐回路、高频放大电路、本振电路、混频滤波电路、中放鉴频集成电路、音频功放电路等单元电路组成的调频对讲接收机。本设计所用的集成芯片有MC3361和LM386，它们是该电路系统的核心。本设计选择性好，灵敏度高，可接收频率范围是150MHz频段。通过对调频对讲机的安装与调试，能对所学过的高频电路原理知识及各单元电路的电路形式，各电路间的耦合方式及信号传送波形和结果，有更深入的了解。同时，也对以前所学过的各类型模拟单元电路的工作原理、电路形式、调试方法、测量技术、整机电路统调技巧等方面知识，得到全面的、系统的训练。为今后从事本专业工作奠定了坚实的技术基础。

关键词
调频MC3361；混频；本振；鉴频   

150MHz Frequency band narrow band frequency modulation wireless receiver
 Author: Chen Chunming    03xin3
Instructs teacher:Wu Guisong    adjunct professor
(Huizhou electronic science department, Guangdong, Huizhou, 516007)

Abstract
This design is by the input tuning circuit, the high-frequency amplification electric circuit, this inspires the electric circuit, the mixing filter circuit, center puts the warning frequency  integrated circuit, the audio frequency merit puts the frequency modulation which unit electric circuit and so on electric circuit is composed to speak the receiver. The integrated circuits of the design have MC3361 and LM386.They are the core of the circuitry. This design selectivity good, the sensitivity is high, may receive the frequency range is 150MHz. Through to the frequency modulation intercom installment and the debugging, can to has studied the high-frequency circuit principle knowledge and various units electric circuit electric circuit form, coupling way and the signal transmission profile and the result between various electric circuits, have a more thorough understanding. At the same time, also to before has studied various types simulation unit aspect knowledge and so on electric circuit principle of work, electric circuit form, debugging method, survey technology, entire machine electric circuit skill, is under comprehensively, the system training. For will be engaged in this specialized work to lay the solid technology base from now on.
Keywords
MC3361；mixing；local oscillation；frequency discrimination

目录
前言..................................................................... 1
1 总体方案与电路原理.......................................................2
2电路电气性能指标参数 .....................................................4
3 整机电路的原理分析与设计.................................................6
3.1 单元电路的分析 ........................................................6
3.1.1 输入调谐回路.........................................................6
3.1.2 高频放大电路 ........................................................7
3.1.3  一混频电路与本振电路 ...............................................7
3.1.4 二混频、限幅中放、鉴频电路 ..........................................8
3.1.5 静噪电路 ........................................................... 9
3.1.6 音频功放电路 .......................................................10
4  各单元电路设计与计算 ..................................................11
4．1  输入回路........................................................... 11
4．2  高频放大回路 .......................................................12
4．3  一本振电路......................................................... 12
4．4  倍频输出回路 .......................................................12
4．5  混频器输出回路......................................................12
5元件的检测与安装焊接 ....................................................13
5.1 制版及安装........................................................... 13
5.1.1 电阻 .............................................................. 13
5.1.2 电容..............................................................  14
5.1.3电感 ............................................................... 14
5.1.4二极管 ............................................................. 15
5.1.5三极管 ........................................................... ..15
5.2硬件的调试 ........................................................... 15
5.2.1 输入回路高频放大级的调试............................................15
5.2.2一本振与一混频电路的调整.............................................16
5.2.3二混频、中放、鉴频电路的调整 ........................................17
5.2.4静噪电路、音频功效电路的调整.........................................17
6结论...................................................................  18
致谢....................................................................  19
主要参考文献........................................................... . 19
附录一电路原理图 ....................................................... 20
附录二  PCB图...........................................................  21
附录三  150MHz频段窄带调频无线对讲机实物图................................22