| 一种高线性度的电流调节式CMOS中频可变增益放大器 |
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| 引用本文： | 恽廷华,唐守龙,罗岚.一种高线性度的电流调节式CMOS中频可变增益放大器[J].应用科学学报,2005,23(6):595-599. |
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| 作者姓名： | 恽廷华 唐守龙 罗岚 |
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| 作者单位： | 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 |
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| 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.
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| 关 键 词： | 模拟乘法器 可变增益放大器 非线性失真 |
| 文章编号： | 0255-8297（2005）06-0595-05 |
| 收稿时间： | 2004-07-26 |
| 修稿时间： | 2004-07-262004-10-26 |
A High Linearity Current-Steering CMOS IF VGA |
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| YUN Ting-hua,TANG Shou-long,LUO Lan.A High Linearity Current-Steering CMOS IF VGA[J].Journal of Applied Sciences,2005,23(6):595-599. |
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| Authors: | YUN Ting-hua TANG Shou-long LUO Lan |
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| Institution: | National ASIC System Engineering Research Center, Southeast University, Nanjing 210096, China |
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| 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. |
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| Keywords: | analog multiplier variable gain amplifier nonlinear distortion |
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