高频电子线路实训论文要点

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高频电路设计与制作

实训论文说明书

题目：调频接收机

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2014年1 月9 日

摘要

收音机从它的诞生至今，不仅方便了媒体信息的传播，也推进了现代电子技术和更先进的电信设备的发展。目前调频式或调幅式收音机，一般都采用超外差式，它具有灵敏度高、工作稳定、选择性好及失真度小等优点。随着科学技术的发展，调频收音机的应用十分广泛，尤其消费类占有相当的市场。从分立元件组成的收音机到集成电路组成的收音机，调频收音机技术以达到十分成熟的地步。从普通的调幅收音机到高级调频收音机，调频收音机以较高的技术含量和较高的音质得到了广泛的欢迎。

在本次设计中，主要是利用集成电路CXA1691BM搭建成为接收机电路。该系统要求能对不同波形的话音信号进行调制、发送、接收和解调。CXA1691BM是一个单芯片FM/AM 收音IC专用无线收录机，由索尼公司生产。使用它来制作收音机可以实现通信的可靠性、通信的距离、设备的微型化、省电和轻巧等。CXA1691BM是一块适用于单声道便携式或手掌式超小型调频收音机的专业电路。应用时外围元件少，成本低廉，电路简单，调试方便，性能稳定等等优点，可以优先选择该电路设计制作收音机。

关键词：CXA1691BM；调频；接收机

Abstract

The radio from its birth until now, went to the lavatory not only media dissemination of information, but also promote the modern electronic technology and more advanced telecommunications equipment development. Currently FM type or amplitude type radio, typically use the specialized super heterodyne type; it has a high sensitivity, stable and good selectivity and the distortion degree of small advantages. With the development of science and technology, the FM radio is widely used, especially the consumer a considerable market. Radio from discrete components to integrated circuits consisting of radio, FM radio technology to reach a mature stage. From ordinary AM radio to advanced FM radio, FM radio with high technological content and high sound quality has been widely welcomed.

In the design, mainly to take advantage of the integrated circuit CXA1691BM structures become the receiver circuit. The system required for modulating the voice signal of the different waveforms, the transmission, reception and demodulation. CXA1691BM is a single-chip FM / AM radio IC dedicated wireless radio cassette recorders manufactured by Sony. Use it to produce the radio can be achieved the reliability of communication, the communication distance, the miniaturization of the device, saving and lightweight, etc... CXA1691BM a mono portable or palm small FM radio professional circuit. Fewer external components in the application, and low cost, simple circuit, commissioning, stable performance advantages, Radio Select the circuit design.

Keywords: CXA1691BM；frequency modulation；Receiver

目录

引言 (2)

1 设计思路 (2)

2 调频接收设计原理 (3)

2.1 高频小信号放大电路 (3)

2.2 混频电路 (3)

2.3 中频放大电路 (3)

2.4 鉴频电路 (4)

3电路工作原理与元件介绍 (4)

3.1 原理框图 (4)

3.2 工作原理 (4)

3.3 CXA1691BM芯片介绍 (5)

4 电路设计任务 (6)

4.1 接收频率范围 (6)

4.2 信噪比 (6)

4.3 输出功率 (6)

4.4工作电源 (6)

5 电路的焊接和调试方法 (6)

5.1 接收机的安装与焊接 (6)

5.2 接收机的调试方法 (7)

6 实训总结 (7)

谢辞 (9)

参考文献 (10)

附录 (11)