1、1 调频收音机的设计 内容摘要:本课题主要研究调频收音机的设计全过程,各部分电路的组成、作用、性能 指标和工作原理。 设计方法主要采用了两块集成电路 TA7335P 和 FS2204, 使电路设计变 得简单。主要的设计思路是:由天线、输入回路、高频放大电路、混频电路、本机振荡 电路、中频放大电路、鉴频电路、低频功率放大电路、扬声器组成。本设计成果,基本 上满足要求,性能指标符合。本电路缺点是噪声大,电路失真较明显等,还需要进一步 改进。 关键词:调频 混频 鉴频 低频放大 中频放大 2 Design for FM radio Content abstract: This topic resea
2、rch FM receiver design process, each part of the circuit, composition, function, performance index and work principle. Design method mainly adopts two integrated circuit TA7335P and FS2204, the circuit design simplicity. The design of the main idea is: by antenna, input circuit, high frequency ampli
3、fier circuit, frequency mixing circuit, this machine oscillating circuit, intermediate frequency amplifier circuit, popularly used circuit, low-frequency power amplifier circuit, speaker composition. This design results, basically meet the demands, performance index comply with. This circuit faults
4、is large noise, circuit distortion is obvious, and also needs further improvement. Key words: FM Frequency mixing Popularly used Low frequency amplifier Intermediate frequency amplifier 3 目录 Design for Design for FM radioFM radio 2 前言 4 1 调频收音机设计 错误错误!未定义书签。未定义书签。 1.1 调频广播与单声道收音机的基本组成 . 4 1.1.1 调频波的特点 4 1.1.2 调频广播的优点 5 1.1.3 单声道调频收音机基本组成及信号流程 5 1.2 调频头电路 . 6 1.2.1 调频头电路的组成、作用与要求 6 1.2.2 输入回路 7 1.3 高频放大电路 . 9 1.3.1 晶体管共基极高放电路 9 1.3.2 场效应管共源极高放电路 10 1.4 变频电路 . 10 1.5 自动频率控制电路(AFC) . 12 1.6 调频头电路实