摘要近年来，现代信息技术水平的发展日新月异，社会人士对生活品质的要求越来越 高，生活方式也越来越趋于智能化和无线化。在生产生活中很多控制的终端都是移动 的，因此需要有更新的、更加智能化和人性化而且接受信号更灵敏的无线数据的传输 方式出现。无线发射的运用非常广泛，比如在遥控设备、门禁系统、数据采集、上下 班打卡、小型无线数据终端、红外技术等等领域中，无线通信技术都发挥了很大的作 用。随着电路制作工艺、微电子技术和集成电路技术的进一步改善，无线通信技术实 现地越来越容易，传输速度在不断变快的同时传输的安全性也大幅度提高，对传统的 有线网络的地位构成了一定的威胁。83859

本文系统设计出一种基于 STC89C51 单片机作为主控芯片，PT2262 芯片作为发射 芯片的无线数据发射模块，给出了比较完整的基于单片机的无线发射模块电路设计， 论述了基于单片机的无线发射的背景、原理、基本框架以及程序流程框图，对无线发 射模块的设计进行了详细的介绍，同时也对其中重要的解码器和变容二极管调频的知 识进行了详细说明。在系统设计过程中，采用分模块设计思路，使各模块功能更加明 确，结构清晰明了，可靠性更高。整个系统电路成本低廉，而且实现简单，产生的功 耗较低，有很强的实用性。

毕业论文关键词：单片机；无线发射；变容二极管；

Abstract In recent years, the development of modern information technology is changing with each passing day, the demand for quality of life is higher and higher, and the life style is more and more intelligent and wireless。 In the production and life of a lot of control of the terminal is mobile, and therefore need to be updated, more intelligent and humane and more sensitive to accept the signal transmission of wireless data。 The use of wireless transmission is very extensive, such as in the remote control equipment, access control systems, data acquisition, work card, small wireless data terminals, infrared technology and so on in the field, wireless communication technology play great role。 With the circuit making further improvements in technology, microelectronic technology and integrated circuit technology, wireless communication technology to realize more and more easily, transmission speed in changing rapidly and transmission security is greatly improved, the status of traditional wired networks constitute the threat。

The system designs a STC89C51 microcontroller as the main control chip, PT2262 chip as transmitting chip wireless data transmission module, and gives a relatively complete single-chip wireless transmitter module circuit design based on, discusses the based on single chip wireless emission background, principle, basic framework and program flow chart of the, design of wireless transmitter module of detailed introduction, as well as the detailed description of the decoder and a varactor diode for FM knowledge。 In the system design process, the use of sub module design ideas, so that the function of each module is more clear, the structure is clear, and the reliability is higher。 The whole system circuit is low cost, and the realization is simple, the power consumption is low, there is a strong practical。

Key words: single chip microcomputer; wireless transmission; variable capacitance diode;

目 录

第一章 绪论 1

1。1 课题研究背景及选题意义 1

1。2 本课题国内外发展现状及未来趋势 2

1。3 本文的基本结构及主要内容 4

第二章 无线发射技术的理论基础