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 filter1目录第一章绪论 ............................................................................... 11.1 宽带放大器简介 .........
