无线调频发射器

电子机电论文编号:JD990   论文字数:18065,页数:31

 目  录
 
 引言  1
    1  绪论  1
1.1 课题设计  1
 1.1.1课题设计原因  1
 1.1.2课题设计目的  1
 1.1.3课题设计目标  2
1.2 本文内容和组织结构  2
  2  硬件部分介绍  3
 2.1 调制部分  3
 2.1.1无线通信中的调制理论  3
 2.1.2BA1404F芯片介绍  3
 2.1.3硬件电路实现  6
 2.2 锁相部分  6
    2.2.1锁相环及其应用背景  6
    2.2.2BU2618FV芯片介绍  7
    2.2.3硬件电路实现  9
 2.3 电路的统一性  10
   2.3.1直流升压电路  10
     2.3.2 VCO和LF实现完整的锁相环  10
 2.4 电路的软件实现  11
 2.5 系统的可靠性分析和抗干扰分析  12
   3  软件部分介绍  14
       3.1 单片机应用系统设计  14
       3.2  MSP430单片机及其应用平台  15
       3.3 应用程序设计及算法  18
           3.3.1低功耗实现  18
 3.3.2液晶驱动  20
 3.3.3时钟部分  20
           3.3.4按键识别  22
           3.3.5对锁相环频率合成器的输出控制 25
           3.3.6FLASH实现存储功能  27
   4  总结与展望  29
 谢辞  30
 参考文献  30
      附录  31

摘  要 
 本课题通过综合应用锁相环（PLL）频率合成器BU2618FV和单片机MSP430F112控制立体声音乐集成芯片BA1404实现的无线调频发射器。具有低功耗和数字发射频率设置功能。微功耗单片机MSP430F112作为整个系统的控制核心对系统进行全局操作，将锁相环频率合成器的分频比控制在所需要的范围以实现发射频率的数字化可调节,同时通过其低功耗特性实现整个系统的低功耗；锁相环频率合成器联合外部电路VCO与低通滤波器共同组成锁相环路，实现发射频率的精确锁定与手动可调节。立体声音乐芯片对输入乐音进行调频发射，是一个完整的通信发端。系统的发射频率范围在88MHZ~108MHZ。通过天线将信号发射出去，并用收音机将信号进行接收验证。本课题所研究的系统可以实现发射数据的存储，并将发射频率数据显示于液晶上，实现可视化。应用直流电压转化芯片MC34063进行不同元件之间的电压转化，以保证整机供电的一体性。
 
 关键词：调频发射；BU2618FV；MSP430；BA1404；低功耗 
                            
  
 Abstract
 The aim of this discussion is about the sender of a wireless communication system. This discussion of problem is overpass by the application of the chips of frequency synthesize implement BU2618FV and micro controller single chip MSP430F112 to operate the sub system which dimensional sound music modulation chip BA1404 was used to modulate frequency of the input sound single. MSP430F112 is the core of the whole wireless system, it duty is to operate the whole system and made all the functions we set before come true. We use the micro controller to setup the divide ratio of the frequency synthesize BU2618FV. As the divide ratio was set, we can adjust the transmit frequency up and down just as one need. The frequency synthesize BU2618FV combined with two exterior circuits VCO and LF so it can build up a integrity Phase Locked Logic which made the transmit frequency locked and ensure us to control the transmit frequency more exactly and allow people to tune up the frequency by use hand. The dimensional sound music chip BA1404 modulate the input music single, this is a integrity communication system. It can run with ultra power low and set all with digital frequency, meanwhile, this system can also save data when power is off. This system can give the transmit frequency between 88MHZ and 108MHZ. By transmit the input single with antenna already, we then take over the single by using a wireless radiogram, while the single was received, this system was proved. In order to make this system more friendly, we also used the liquid glittering to show the transmit frequency. Appliance the DC-DC chip MC34063 to turn the voltage of different kind of elements up and down. By doing this way, this system can make sure our system with one criterion power supply only.
 
 Key words: FM; BU2618FV; MSP430; BA1404; ultra low power