论文总字数：23377字
摘 要
收音机是我们生活中经常见到、使用的物品，它里面的主要组成器件有机械器件、电子器件、磁铁等，它的功能是用天线接收空间的电台信号，经检波（解调）还原成音频信号，通常该信号为高频信号，使用者通过耳机或者扬声器便可以收听到电台节目。
目前，制作收音机主要采用超外差和超再生原理，其中大部分是采用超外差原理。超外差式接收机频率稳定，抗干扰较强，使用在单片机时性能比较稳定。超再生原理发现已久，由于具有低功率、电路简便、灵敏度高、价格低廉等优点，近些年对于超再生收音机的研制又引起了人们的关注。
本次设计使用分立元件如三极管、电容、电感等与超再生接收模块、功率放大器模块相结合来实现超再生收音机。收音机的主要组成部分有: 预选滤波器，前端低噪声放大器，FM波转换FM-AM波电路、SCSR120超再生集成接收电路、LM386功率放大器。
预选滤波器采用LC并联选频电路，前端低噪声放大器采用单三极管共射级电路，FM波转换FM-AM波电路采用共基极放大器与LC失谐电路相连接，SCSR120超再生接收模块其振荡器是电容三点式结构,采用自熄灭方式，LM386功率放大器默认增益200。
在此项目实施过程中，前期利用multisim软件进行设计，对设计的电路进行仿真测试和优化改进，完成了将FM波转换为FM-AM波。最终，通过硬件实现了整个收音机的设计，可以清晰的听到接收到的电台声音。
关键词：超再生；振荡器；调频波转换为调频调幅波。
Radio design based on the principle of super regenerative
Abstract
Radio is a common item in our life, it is composed of mechanical device, electronic device, magnet and so on. Its function is to reduce the high frequency signal received from the antenna to audio signal by the detector (demodulation), and then sent signal to the headphones or horns as sonic.
At present, we mainly adopt the super heterodyne and super regenerative theory to make radios, most of them use the super heterodyne principle. Super heterodyne receiver has stable frequency, good anti-interference ability, and combined with single chip with the relatively stable performance. Super regenerative principle has been found for a long time, because of its low power, simple circuit, high sensitivity, low cost and so on. In recent years, the development of super regenerative radio has aroused people's attention.
The design uses discrete devices such as transistors, capacitors, inductors, and the super regenerative receiving module, power amplifier module combined to achieve a super regenerative radio. The main components of the radio are: pre filter, front-end low noise amplifier, transform FM wave to FM-AM wave circuit, SCSR120 integrated super regenerative receiver circuit, LM386 power amplifier.
We use LC parallel resonant circuit to make pre filter，and use single transistor common emitter circuit to make the front low noise amplifier. The FM wave converted FM-AM wave circuit is made up of the common-base amplifier connected with the LC circuit. SCSR120 super-regenerative receiver module which is a three-point capacitance oscillator structure, the use of self-extinguishing way, and LM386 amplifier gain is 200 by default.
During the implementation of this project, the design of the Multisim software was used to simulate, optimization and improvement the design of the circuit, completed the conversion of FM wave to FM-AM wave. In the end, through the hardware realization of the whole radio design, can clearly hear the received radio sound.
Keywords: super regeneration; oscillator; FM wave conversion to FM- AM wave.
目 录
摘要 ……………………………………………………………………………………2
Abstract …………………………………………………………………………… 3
目录 ……………………………………………………………………………………4
第一章 绪论 ………………………………………………………………………5
1.1收音机简介 …………………………………………………………5 1.2研究现状 …………………………………………………………5
1.2.1超再生收音机………………………………………………………5
1.2.2超外差收音机………………………………………………………6
1.2.3两者性能对比………………………………………………………6
1.3 本课题的研究目的和主要研究内容 ……………………………………7
第二章 超再生振荡器 ……………………………………………………………7
2.1振荡器的基本原理 ………………………………………………………7
2.2振荡器的基本原理 ………………………………………………………9
2.1.1三点式振荡器结构…………………………………………………9
2.1.2三点式振荡器实用电路……………………………………………10
2.1.3电路分析和计算……………………………………………………11
2.3超再生振荡器 …………………………………………………………14
2.2.1基本原理 …………………………………………………………14
2.2.2工作模式 …………………………………………………………15
第三章 超再生收音机设计 …………………………………………………………16
3.1匹配网络 …………………………………………………………17
3.2前端LNA …………………………………………………………17
3.3调频波转化为调频调幅波…………………………………………………18
3.4超再生振荡器 …………………………………………………………22
3.5功率放大器 …………………………………………………………24
第四章 硬件设计测试与性能分析………………………………………………………26
4.1硬件电路板设计 …………………………………………………………26
4.2收音机性能测试 …………………………………………………………27
4.3性能分析 …………………………………………………………30
总结 ……………………………………………………………………………………32
致谢 ……………………………………………………………………………………33
参考文献（References） …………………………………………………………33
- 绪 论
1.1收音机简介
收音机是我们生活中经常见到、使用的物品，里面的主要组成器件有机械器件、电子器件、磁铁等，它的主要功能是用天线接收空间中的无线电信号，并将信号放大、检波后还原出原音频信号，再通过扬声器或者耳机将声音输出。
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