程控放大器

关键词：程控增益；集成运放；反馈网络；自动控制
I
Abstract
Programmable gain amplifier is designed in this paper. This structure and function of programmable gain amplifier and its main features are described. Finally cited the use of circuit. Amplifier is one of the most widely used electronic circuits. Its function is to amplify the input signal without distortion. In the broadcast, communication, automatic control, electronic equipment, the amplifier is an essential part of amplifier. Among all kinds of the electronic circuits used in all kinds of electronic instruments and equipments, the integrated operational amplifier is the most widely used analog electronic device. Integrated operational amplifier with different feedback network and using different feedback mode, you can constitute a completely different functions and features a variety of integrated operational amplifier circuit, referred to as the circuit. The operational amplifier circuit is the most basic part in various electronic circuits. The system can achieve gain from the program control, to meet the technical indicators, measurement accuracy, reliability, performance and price is relatively high.
摘 要
文章主要是论述程控增益放大器这一电子线路元器件， 对其主要的功能和结 构进行了详细的说明，并且详细的设计了程控增益放大器的使用电路。 在电子技术高度发达的今天，无论是通信技术还是自动在控制，电视还是广 播，民用还是军用，大到卫星上天，小到手提电子设备，对电信号的处理都变得 尤为重要和不可或缺，而电信号在传递过程中会出现衰减，往往接收设备接收到 的信号都比较微弱，所以，对信号的放大就变得尤为重要。 放大器就是因应这样要求而诞生的， 它是一种把输入的微弱信号进行必要放 大的一种电子电路或仪器设备，可以对输入的电压信号、电力信号或者功率进行 必要的放大，这种放大必须保证放大信号保持原有状态，即不失真。所以，放大 电路和具有放大功能的集成电路在各种电子设备和比较常见的电子电路中得到 了广泛的应用，比如，常见的手机、音响、电视、雷达和各种工业自动控制等。 在众多的放大电路中， 集成运算放大器一枝独秀， 被很多电子设备广泛采用。 而程控集成运放因其增益可控的优点，以及可靠性高，成本低成为放大电路的佼 佼者。本文将重点介绍程控放大器。
Key words:
control ;
gain programmable; Operational amplifier; feedback network; auto
II
目 录
摘 要.......................................................................................................................................................... I ABSTRACT.............................................................................................................................................II 目 录.......................................................................................................................................................III 1 引言.........................................................................................................................................................1 1.1 程控增益放大器的简介................................................................................................................. 1 1.1.1 程控增益放大器的分类.......................................................................................................... 1 1.1.2 程控增益放大器的原理.......................................................................................................... 1 1.2 程控增益放大器的设计要求和技术指标.................................................................................... 2 1.2.1 设计参数的选定..................................................................................................................... 2 1.3 总结设计方案.............................................................................................................................ຫໍສະໝຸດ Baidu.. 3 1.3.1.方案论证和总体设计方案框图及分析.................................................................................. 3 1.3.2.总体设计方案及分析.............................................................................................................. 4 2.1 程控开关........................................................................................................................................ 5 2.2 集成电路运算放大器设计............................................................................................................ 6 2.2.1 集成电路运算放大器中的电流源.......................................................................................... 7 1)基本电流源........................................................................................................................................ 7 2)有源负载............................................................................................................................................ 7 3)电流源的应用.................................................................................................................................... 7 2.2.2 .偏置电路................................................................................................................................. 8 2.2.3 输入级..................................................................................................................................... 8 2.2.4 中间级..................................................................................................................................... 9 2.2.5 输出级..................................................................................................................................... 9 2.3 反馈电阻网络............................................................................................................................... 10 2.4 增益调整电路设计........................................................................................................................11 3 整体电路图及工作原理.......................................................................................................................11 3.1 拨码开关的使用...........................................................................................................................11 3.2 电路参数计算与选择....................................................................................................................11 3.3 电路仿真结果............................................................................................................................... 12 4 设计总结.............................................................................................................................................. 13 参考文献................................................................................................................................................. 14
陕西电子科技学院
本科毕业论文（设计）
题 目
程控增益放大器的设计
（中、英文)
The Design of programmable gain amplifier
作 者 姓 名 专 业 名 称 学 科 门 类 指 导 老 师 提交论文日期 成绩等级评定
高亚丽 电子信息科学与技术 理 学 余建权 二〇一六年五月