| 低功耗、高线性CMOS可编程放大器 |
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| 引用本文： | 王自强,池保勇,王志华.低功耗、高线性CMOS可编程放大器[J].清华大学学报(自然科学版),2006,46(4):519-522. |
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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,微电子学研究所,北京,100084 |
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| 基金项目： | 科技部科研项目;中国科学院资助项目 |
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| 摘 要： | 针对接收机前端中可变增益放大器需要高线性处理大信号的问题,分析了使用源极退化电阻以及跨导增强电路的放大器线性度;设计了使用改进型跨导增强电路的放大器。它具有更强的跨导增强能力,同时减小了输入M O S管跨导由于漏源电压变化产生的非线性失真。提出了一种对称的可变电阻结构,它降低了M O S管开关带来的非线性。仿真结果表明,放大器在3.3V电源电压下直流功耗为1.5mW,在1~10MH z带宽、3~24 dB增益范围内,差分输出信号峰峰值为3.3V时,总谐波失真低于-60 dB。
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| 关 键 词： | 可变增益放大器 可编程增益放大器 高线性 |
| 文章编号： | 1000-0054(2006)04-0519-04 |
| 修稿时间： | 2005年3月30日 |
Low power, high linearity CMOS programmable gain amplifier |
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| WANG Ziqiang,CHI Baoyong,WANG Zhihua.Low power, high linearity CMOS programmable gain amplifier[J].Journal of Tsinghua University(Science and Technology),2006,46(4):519-522. |
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| Authors: | WANG Ziqiang CHI Baoyong WANG Zhihua |
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| Abstract: | Variable gain amplifiers(VGA) used in the front ends of receivers need to amplify large signals with high linearity.An amplifier was designed with an improved gm-boost circuit and increased transconductance of the input metal oxide semiconductor(MOS) transistor which reduces the distortion caused by the drain-source voltage variation.A symmetrical variable resistor structure was used to further reduce the non-linearity from the MOS switch.Simulation results show that the amplifier consumes 1.5 mW at 3.3 V.The total harmonic distortion of a 3.3 V differential output signal is less than-60 dB for frequencies from 1 to 10 MHz and voltage gains from 3 to 24 dB. |
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| Keywords: | CMOS |
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