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超外差调幅接收机的设计与实现

摘要：超外差接收系统由于其抗干扰能力强，频带宽，音质好等特点，广泛应用于通信系统中。

本设计采用集成芯片CD7613CP来完成超外差调幅接收机设计，该芯片CD7613CP内部由混频电路（包括本地振荡电路和输入电路）、中频放大电路、检波电路、功率放大电路等组成。本文着重讨论并掌握调幅接收机的设计与调试方法；了解接收机主要技术指标；熟悉单片集成芯片CD7613CP内部功能及各引脚作用；掌握电路的布局、布线和焊接工艺等。

关键词：超外差接收系统；CD7613CP芯片

Design and Implementation of the superheterodyne AM receiver

Abstract:The superheterodyne receiver systems due to its strong anti-jamming capability, frequency bandwidth, good sound quality, features, widely used in communication systems.

This design uses the IC CD7613CP to constitute a superheterodyne AM receiver AM chip CD7613CP internal circuit consists of a mixer circuit (including the local oscillation circuit and the input circuit), intermediate frequency amplifier, detector circuit, power amplifier circuit. This paper focuses on the design and debugging and mastery of the AM receiver; understand the receiver of the major technical indicators; familiar with the role of monolithically integrated chip CD7613CP internal functions and pin; master circuit layout, wiring and welding.

Keywords: superheterodyne receiving system; the CD7613CP chip

西安欧亚学院本科论文（设计）

目录

1 2

前言 ........................................................................................................................... 1 毕业设计的任务与要求 ........................................................................................... 2 2.1 设计任务 ............................................................................................................... 2 2.2 设计要求 ............................................................................................................... 2 3

调幅接收机的主要性能指标 ................................................................................... 3 3.1 频率范围 ............................................................................................................... 3 3.2 中频频率 ............................................................................................................... 3 3.3 选择性 ................................................................................................................... 3 3.4 灵敏度 ................................................................................................................... 3 3.5 输出功率 ............................................................................................................... 3 3.6 镜像抑制 ............................................................................................................... 3 3.7 放大倍数 ............................................................................................................... 4 3.8 直流电源 ............................................................................................................... 4 4

调幅接收系统的设计方法 ....................................................................................... 5 4.1 调幅接收系统实现框图： ................................................................................... 5 4.2 接收系统方案选择： ........................................................................................... 5 5

集成调幅芯片CD7613CP ........................................................................................ 7 5.1 CD7613CP芯片特点 ............................................................................................ 7 5.2 内部功能框图及各引脚功能 ............................................................................... 7 6

超外差调幅接收机外围电路设计 ........................................................................... 9 6.1 调幅接收机的输入电路 ....................................................................................... 9 6.2 调幅接收机的变频级电路 ................................................................................. 10 6.3 调幅接收机的中频放大级电路 ......................................................................... 11 6.4 调幅接收机的检波和自动控制电路 ................................................................. 11 6.5 前置低放电路和功率放大电路 ......................................................................... 12 7

电路的布局、组装和焊接 ..................................................................................... 13 7.1 应用的元器件说明 ............................................................................................. 13

7.1.1 7.1.2

元器件清单 ......................................................................................... 13 元件说明 ............................................................................................. 13

7.2 普通电路板的布局 ............................................................................................. 14 7.3 接收机的焊接和组装 ......................................................................................... 15

7.3.1 7.3.2

准备工作 ............................................................................................. 15 安装焊接 ............................................................................................. 16

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