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应用科学学报 ›› 2005, Vol. 23 ›› Issue (6): 595-599.

• 论文 • 上一篇    下一篇

一种高线性度的电流调节式CMOS中频可变增益放大器

恽廷华, 唐守龙, 罗岚   

  1. 东南大学国家专用集成电路系统工程技术研究中心, 江苏南京 210096
  • 收稿日期:2004-07-26 修回日期:2004-10-26 出版日期:2005-11-30 发布日期:2005-11-30
  • 作者简介:恽廷华(1981-),男,安徽宣城人,博士生,E-mail:shortrain@seu.edu.cn

A High Linearity Current -Steering CMOS IF VGA

YUN Ting-hua, TANG Shou-long, LUO Lan   

  1. National ASIC System Engineering Research Center, Southeast University, Nanjing 210096, China
  • Received:2004-07-26 Revised:2004-10-26 Online:2005-11-30 Published:2005-11-30

PDF

105

被引次数

13

摘要： 基于模拟乘法器设计了一种电流调节式中频可变增益放大器,并根据强反型下MOSFET的I-V模型(考虑二阶效应)建立和分析了电路非线性模型,提出了一种线性度优化方法.基于0.25 μm CMOS工艺的模拟结果表明,电源电压3.3 V下可变增益放大器与优化前相比在输入信号最大时IM3减小了33 dB,增益控制范围增大了12 dB;最小增益处ⅡP3达到17.5 dBm,最大增益处噪声系数为7.8 dB.

关键词: 模拟乘法器, 可变增益放大器, 非线性失真

Abstract: A current-steering IF VGA based on an analog multiplier is designed.A nonlinear model is established and analyzed based on the MOSFET I-V model in strong inversion, and a linearity optimization method is presented.Simulation results based on 0.25 μm CMOS technology indicate that about a 33 dB decrease in the third order inter-modulation at maximum input and a 12 dB increase in gain control range of the optimized VGA with 3.3 V supply voltage are obtained.The ⅡP3 at the minimum gain setting is 17.5 dBm, and the minimum NF is 7.8 dB.

Key words: analog multiplier, variable gain amplifier, nonlinear distortion

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