文档介绍：《通信电子线路》课程设计说明书
调频接收机设计
院、部: 电气与信息工程学院
学生姓名:
指导教师: 职称讲师
专业: 电子信息工程
班级: 电子1004班
学号:
完成时间: 2012年12月12日
摘要
本次课程设计,其目的是得到一个简易的调频接收机。所谓调频接收机,是指将所要接收的电台在调谐电路里调好以后,经过电路本身的作用,就变成另外一个预先确定好的频率,然后再进行放大和检波。这个固定的频率,是由差频的作用产生的。
在调频接收机的设计过程中,应将其分为选频网络、高频放大、变频、解调、低放和低频功放六个部分。但是在设计时必须全面考虑,妥善处理一些相互牵制的矛盾,特别要抓住主要矛盾(稳定性、选择性、失真等),才能使得接收机有较好的指标。接收机能够大大提高接收机的增益、灵敏度和选择性。调频电路的典型应用是调频接收机,其优点是:一、容易得到足够大而且比较稳定的放大量。二、具有较高的选择性和较好的频率特性。三、容易调整。缺点是电路比较复杂,同时也存在着一些特殊的干扰,如像频干扰、组合频率干扰和中频干扰等。随着集成电路技术的发展,调频接收机已经可以单片集成。
关键词:调频;混频;鉴频
ABSTRACT
The curriculum design, the goal is to have a simple FM receiver. The FM receiver, are to be received by the radio in the tuned circuit in good tune, after the circuit itself, it es a predetermined frequency, and then the amplification and detection. The fixed frequency, by difference frequency effect.
The FM receiver design process, it should be divided in frequency work, high-frequency amplification, demodulation, frequency conversion, low and low frequency power amplifier six parts. But in the design must be prehensively, properly handle some mutual contradiction, especially to capture main contradiction ( stability, selectivity, distortion and so on ), in order to make the receiver has better index. The receiver can greatly improve the gain of the receiver, sensitivity and selectivity.. Frequency modulation circuit is the typical application of FM receiver, the utility model has the advantages of: A, easy to get large enough and stable amount of amplification. In two, high selectivity and good frequency characteristics. Three, easy adjustment. Disadvantage is the electric circuit is plicated, there are also some special interference, such as image frequency interference, combined frequency interference and interference etc.. With the development of integrated circuit technology, FM receiver can already be monolithic integrated.
Key words: FM; mixing; Frequency discriminator
目录
1 设计任务 1
1
设计思路 2
2 调频接收机系统原理分析