无线调频接收机毕业设计.doc

河南机电高等专科学校 毕业设计论文 论文题目：无线调频接收机 系 部： 电子通信工程系 专 业： 通信技术 班 级： 2004级2班 学生姓名： 邹检生 学 号： 0445231 指导教师： 李福勤 2007年06月21日 摘 要 本设计以无线通信作为入口，介绍了目前流行的几种无线接收机体系结构，采用超外差式作为本设计接收机的体系结构，并通过很好的选择元器件，设计了一款无线调频接收机的电路。通过本设计深入的了解了无线通信系统的组成，无线接收机作为用户终端，对产品的实用等功能有系统的理解，从而对无线通信系统（特别是用户接收终端）的设计、开发、生产和调试的技巧、方法都有很大的认识。 本设计着重分析了无线调频接收机的电路原理，并运用集成电路TDA7021T，设计了一款外围元件少接收性能优良的调频接收机。其接收频率覆盖范围广，包括电视伴音的56.25MHz~72.25MHz，校园广播的75MHz~87MHz及普通商用调频广播88MHz~108MHz。且接收性能好，电路整洁，操作简单方便，实用。 关键字 无线通信，超外差式，调频，接收机 Abstract This design takes the entrance by the wireless communication, introduce the present popular several kinds of wireless receivers system structure, uses super heterodyne architecture took this design receiver the system structure, and through the very good choice primary device, has designed a section wireless frequency modulated receiver electric circuit. Through this design thorough understanding wireless communications system composition，the wireless receiver had taken the user terminal，is practical and so on the function to the product has the system the understanding, thus to the wireless communications system (specially is user receives terminal) the design, the development, the production and the debugging skill, the method all has the very big understanding. This design has emphatically analyzed the wireless frequency modulated receiver circuitry, and using integrated circuit TDA7021T, has designed a section periphery part few receptivity fine FM receiver. Its receive frequency cover scope is broad, including aural56.25MHz-72.25MHz, campus broadcast 75MHz-87MHz and ordinary commercial FM broadcast 88MHz-108MHz. Also receptivity good, electric circuit neat, the operation simple is convenient, practical. Key words Wireless communication，super heterodyne，FM, Receiver 目 录 毕业设计任务书………………………………………………………………………Ⅰ 摘要……………………………………………………………………………………Ⅱ 绪论……………………………………………………………………………………1 第1章 无线通信系统基础……………………………………………………………3 1.1通信系统分类…………………………………………………