宽带放大器的设计与研究毕业设计.doc

. . 毕业设计（论文）说明书 题目：宽带放大器的设计与研究 系 名 专 业 年 级 姓 名 指导教师 年 月 日 摘 要 近年来随着计算机和互联网的迅速普及，宽带放大器成为音响、有线电视、无线通信等系统中必不可少的部分。本系统以可控增益放大器AD603为核心，外加STC89C58RD单片机的配合，实现了增益可调的宽带放大器。系统主要由六个模块构成：前级放大电路、可控增益放大电路、无源滤波电路、后级功率放大电路、单片机显示控制模块、稳压电源模块。可控增益放大电路由两片AD603串联构成，可实现40dB的增益调节范围；后级功率放大器采用高速宽带运算放大器AD811，提升了系统的带负载能力。为解决宽带放大器自激及减小输出噪声，本系统采用多种形式的抗干扰措施，抑制噪声，改善放大器的稳定性。 关键词：宽带放大器；可控增益；功率放大；无源滤波 ABSTRACT In recent years, along with the rapid popularization of computer and the Internet，a wide-band amplifier as an essential part of audio, cable TV, wireless communication system .Adopting the controllable gain amplifier—AD603 as the core and combining with STC89C58RD MCU,this system can achieve a wide-band amplifier with adjustable gain.This system is constitude by six blocks: pre-ampilfier circuit, controllabl-gain ampifier circuit, passive filter circuits,the power amplifier circuit,MCU display control module, stabilized voltage supply module.Constitude by two AD603 in series,the controllable-gain amplifier circuit can achieve 40dB of gain adjustment range. The power amplifier use high-speed broadband operational amplifier—AD811,enhancing load capacity of the system.In order to solve the self-oscillattion problem and reduce the output noise,the system use various forms of anti-jamming measures to reduce noise and improve amplifier stability. Key words: wide-band amplifier; controllable gain; power amplifier; passive filter . 目 录 TOC \o 1-2 \h \z \u HYPERLINK \l _Toc261295984 第一章 绪论 PAGEREF _Toc261295984 \h 1 HYPERLINK \l _Toc261295985 1.1 宽带放大器简介 PAGEREF _Toc261295985 \h 1 HYPERLINK \l _Toc261295986 1.2 课题意义 PAGEREF _Toc261295986 \h 2 HYPERLINK \l _Toc261295987 1.3 课题设计要求 PAGEREF _Toc261295987 \h 3 HYPERLINK \l _Toc261295988 第二章 系统设计方案论证和比较 PAGEREF _Toc261295988 \h 4 HYPERLINK \l _Toc261295989 2.1 系统总体设计及原理方框图 PAGEREF _Toc261295989 \h 4 HYPERLINK \l _Toc261295990