目 录
1 引言 ...............................................................................................................................1
1.1 通信的发展 ........................................................................................................1
1.2 广播的发展现状 ................................................................................................1
1.3 设计思路 ............................................................................................................2
2 系统概述 ........................................................................................................................3
2.1 系统功能要求 ....................................................................................................3
2.2 系统组成 .............................................................................................................3
3 方案论证与比较 ...........................................................................................................5
3.1 无线调频发射电路设计方案论证与选择 ........................................................5
3.2 压控振荡器方案论证与选择 ............................................................................6
4 系统硬件电路的设计 ...................................................................................................7
4.1 单片机控制电路 ................................................................................................7
4.1.1 内部结构 .................................................................................................7
4.1.2 引脚功能 .................................................................................................9
4.2 调频调制发射电路 ..........................................................................................11
4.2.1 调频调制电路的特点 ...........................................................................11
4.2.2 结构图 ...................................................................................................11
4.2.3 允许的最大值 .......................................................................................12
4.2.4 工作范围 ...............................................................................................12
4.2.5 调频调制发射电路的组成 ...................................................................12
4.3 键盘部分 ..........................................................................................................14
4.3.1 单片机键盘和键盘接口概述 ...............................................................14
4.3.2 单片机键盘接口和键功能的实现 .......................................................15
4.4 LC 振荡电路 ...................................................................................................16
4.5 调频放大电路 ..................................................................................................17
4.6 电源模块设计 ..................................................................................................17
4.6.1 单元电源电路设计 ...............................................................................17
4.6.2 直流稳压电源的检测 ...........................................................................17
5 系统程序的设计 .........................................................................................................18
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