调频收音机设计.doc

随着科学技术的发展，调频收音机的应用十分广泛，尤其消费类占有相当的市场 。从分离元件组成的收音机到由集成电路组成的收音机，调频收音机技术已达到十分成熟的地步。从普通的调幅收音机到高级调频收音机，调频收音机以较高的技术含量和较高的音质得到了广泛的欢迎。

本课题主要研究调频收音机的设计全过程，各部分电路的组成、作用、性能指标和工作原理。设计方法主要采用了两块集成电路TA7335P和FS2204，使电路设计变的简单。主要的设计思路是：由天线、输入回路、高频放大电路、混频电路、本机振荡电路、中频放大电路、鉴频电路、低频功率放大电路、扬声器组成。

本课题设计成果，基本上满足要求，性能指标符合。本电路缺点的是音质噪声大，电路还有一点失真等等，还需改进。

关键词  调频收音机发展、调频收音机、调频收音机设计

ABSTRACT

Along with the development of science and technology, FM radios are widely used, especially consumer accounts for a sizeable market. Separation of components from the radio component of the integrated circuit components from the radio, FM radio technology has reached a very mature stage. From the ordinary AM radios to senior FM radios, FM radio to a higher technological content and high sound quality has been widely welcomed. 

The main research topics FM radio entire process of design, the circuit of the composition, function, performance and principle. Design methods used two IC TA7335P and FS2204, the circuit design of a simple change. The main design ideas : from antenna input circuit, high-frequency amplifier, mixer circuit, the machine oscillation circuit, IF amplifier, Kam-frequency circuit, low-frequency power amplifier, loudspeakers component. 

Design results of this project, basically meet the requirements with performance indicators. The shortcomings of the circuit noise is the sound quality, there is little distortion circuit, and so on, need to improve. 

Keywords   FM radio, FM radio, FM radio design 

目   录

摘 要…………………………………………………………………………………….I

ABSTRACT……………………………………………………………………………Ⅱ

1绪论……………………………………………………………………………………1

1.1课题背景……………………………………………………………………….1

1.2课题概论…………………………………………………………………………1

2调频收音机设计………………………………………………………………………2

2.1调频广播与单声道调频收音机的基本组成………………………………………..2

        2.1.1调频波的特点……………………………………………………………...2

        2.1.2调频广播的优点……………………………………………………………3

        2.1.3 单声道调频收音机基本组成及信号流程…………………………………...4

2.2调频头电路………………………………………………………………………4

2.2.1 调频头电路的组成、作用与要求…………………………………………5

2.2.2 输入回路…………………………………………………………………7

2.3高频放大电路……………………………………………………………………7

2.3.1晶体管共基极高放电路…………………………………………………….8

2.3.2场效应管共源极高放电路…………………………………………………9

2.4变频电路………………………………………………………………………11

2.5自动频率控制电路（AFC）…………………………………………………………12

2.6调频头电路实例分析……………………………………………………………13

2.7中频放大电路……………………………………………………………………13

2.7.1作用与性能要求…………………………………………………………13

2.7.2电路分析…………………………………………………………………14

2.7.3调谐回路的种类…………………………………………………………16

2.7.4典型实例分析……………………………………………………………17

2.8 鉴频电路与去加重电路…………………………………………………………17

2.8.1鉴频电路…………………………………………………………………17

2.8.2鉴频的基本方法…………………………………………………………18

2.8.3电路分析…………………………………………………………………20

2.9低频放大电路……………………………………………………………………20

2.9.1作用、构成、性能要求………………………………………………..21

2.9.2电路分析…………………………………………………………………23

2.9.3典型实例分析………………………………………....................24

2.10整机电路分析…………………………………………………………………24

2.10.1集成电路调频/调幅收音机设计…………………………………………25

3结论………………………………………………………………………...................26

参考文献………………………………………………………………………………27

致谢…………………………………………………………………………………….31