| CMOS可变增益放大器设计概述 |
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| 引用本文： | 王自强,池保勇,王志华.CMOS可变增益放大器设计概述[J].微电子学,2005,35(6):612-617. |
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| 作者姓名： | 王自强 池保勇 王志华 |
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| 作者单位： | 1. 清华大学,电子工程系,北京,100084
2. 清华大学,微电子所,北京,100084 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，中国科学院资助项目 |
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| 摘 要： | 可变增益放大器是模拟单元电路之一,起着变化增益、调整信号动态范围、稳定信号功率的作用.文章综述了CMOS集成可变增益放大器的研究情况;给出了可变增益放大器的定义、应用、分类和主要指标,描述了多种开环和闭环放大器的结构,分析了相应的增益控制方法及其优缺点;说明了在CMOS工艺下实现放大器增益按指数变化的几种途径.最后,介绍了用于无线数字通信,具有宽带、高线性、低电源电压等高性能可变增益放大器的设计实例.
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| 关 键 词： | 放大器 可变增益放大器 可编程增益放大器 指数增益控制 |
| 文章编号： | 1004-3365（2005）06-0612-06 |
| 收稿时间： | 2005-02-28 |
| 修稿时间： | 2005-02-282005-05-10 |
An Overview of CMOS Variable Gain Amplifiers |
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| WANG Zi-qiang,CHI Bao-yong,WANG Zhi-hua.An Overview of CMOS Variable Gain Amplifiers[J].Microelectronics,2005,35(6):612-617. |
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| Authors: | WANG Zi-qiang CHI Bao-yong WANG Zhi-hua |
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| Affiliation: | 1, Dept. of Elec. Engineer. , Tsinghua Univ. , Beijing, 100084;2. Insti. of Microelec. , Tsinghua Univ. ,Beijing, 100084, P. R. China |
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| Abstract: | Variable gain amplifier(VGA) is an analog circuit,which varies gain,adjusts signal dynamic range and stabilizes signal power.An overview of CMOS integrated variable gain amplifiers is made.The definition of VGA and its function,classification and specifications are elaborated.Different openand closed-loop VGA's are described,and the advantages and disadvantages of gain control strategies are analyzed.Approaches to achieving exponential gain in CMOS technology are explained.Finally,examples of high performance VGA's used in wireless digital communication are introduced,which mainly focus on broad bandwidth,high linearity and low supply power. |
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| Keywords: | Amplifier Variable gain amplifier Programmable gain amplifier(PGA) Exponential gain control |
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