调频无线耳机接收器的设计

调频无线耳机接收器的设计(论文15000字)
摘要：本设计为一调频无线耳机接收器，该接收机包括混频、中放, 鉴频,功放等模块，其中微控制器输出数字电压并经过DA转换控制变容二极管的反向电压，以达到输入回路的调谐，同时保证本振信号的稳定。本文首先介绍了传统超外差式接收机各部分的理论模型和原理，在综合考虑本设计的硬件要求的基础上，进行具体方案的设计。该接收机主要采用了NE602和LA1150两款集成芯片，然后根据设计方案和主要芯片对其硬软件进行了设计，通过调试，该接收机能够实现选台、接收广播和接收特定频点的信号，并且能够达到相应的设计功能。论文最后是系统的整合调优与错误分析，指出了系统的缺陷和改进措施。
关键词：超外差；广播接收机;调频；单片机；电调谐

Design and implementation of FM wireless earphone receiver
Abstract:This design is an FM wireless earphone receiver, which includes frequency mixer,intermediate-frequency amplifier,frequency detector, power amplifier and so on. The micro-controller outputs a digital voltage and controls the reverse voltage of the variable-capacitance diode through DA conversion, in order to achieve the tuning of the input circuit, and at the same time ensure the stability of the local oscillator signal. This thesis first introduces the theoretical model and principle of each part of the traditional superheterodyne receiver. Based on the comprehensive consideration of the hardware requirements of this design, the design of the specific scheme is carried out.The receiver mainly uses two integrated chips, NE602 and LA1150, and then designs its hardware and software according to the design scheme and the main chip. Through debugging, the receiver can select a channel, receive broadcast and receive signals at a specific frequency point. And can achieve the corresponding designed function. At the end of the thesis, theintegrated optimization and error analysis of the system is presented, and the improvement measures of the system are pointed out.
Key words：Superheterodyne; Broadcast receivers; FM; MCU;Electric tuning.
 

目  录
1绪论    1
1.1课题来源及意义    1
1.2 国内外研究情况与发展趋势    1
2 超外差式FM接收机理论基础    2
2.1 天线输入    2
2.2 调谐回路    2
2.3 放大电路    3
2.3.1 高频小信号放大电路    3
2.3.2 音频功率放大    3
2.4 本振及混频    4
2.4.1 正弦波振荡器    4
2.4.2 混频过程    5
2.5鉴频原理    5
3 调频无线耳机接收器的硬件设计    6
3.1各部分功能分析与方案选择    6
3.1.1调谐方案的选择    6
3.1.2前端接收电路    7
3.1.3 鉴频方案的选择    7
3.1.4 频率显示    8
3.2 接收机电路的分析与设计    8
3.2.1前端接收电路    8
3.2.2中放及鉴频电路    10
3.2.3后级音频放大电路    11
3.2.4 电源电路的设计    12
3.2.5 PCB板的设计与实现    13
3.3 控制系统的电路分析    14
3.3.1 控制器的电源电路    15
3.3.2复位电路    16
3.3.3时钟电路    16
3.3.4 SWD接口电路    17
4 无线接收机的软件设计    18
4.1 时钟配置    18
4.2 D/A转换    18
4.2.1 D/A引脚配置    19
4.2.2 DAC配置    19
4.2.3 电压输出    19
4.3 按键输入    20
4.4 屏幕显示    20
5 系统测试    21
5.1 硬件电路测试    21
5.1.1音频功放测试    21
5.1.2中放解调测试    22
5.1.3混频电路测试    23
5.2 软件系统测试    23
5.2.1 模拟电压输出测试    23
5.2.2电调谐与屏幕显示测试    24
5.3 系统的优化与扩展    24
5.3.1 系统降噪优化    25
5.3.2 其他扩展功能的理论实现    25
6 总结    25
6.1 论文总结    25
6.2 所得所悟    26
参考文献    26
附录    27
致谢    29