| 一种改进的增益增强共源共栅放大器的设计 |
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| 引用本文： | 马磊,原义栋,张海峰. 一种改进的增益增强共源共栅放大器的设计[J]. 现代电子技术, 2011, 34(10): 145-148 |
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| 作者姓名： | 马磊 原义栋 张海峰 |
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| 作者单位： | 中国电力科学研究院通信与用电技术分公司,北京,100192 |
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| 摘 要： | 设计了一种适用于流水线A／D转换器的全差分跨导放大器，通过采用单端放大器的增益增强方法，使运算放大器即具有较高的直流增益，又有较小的面积及较好的版图匹配性。通过对普通开关定容共模负反馈电路的改进，改善了建立时间减小了放大器输出共模的抖动。电路采用SMIC0．18μmCMOS工艺，并在Cadence下对电路及版图进行了仿真，结果表明：小信号低频电压增益119．3dB；单位增益带宽378．1MHz；相位裕度60°。
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| 关 键 词： | 流水线ADC 增益增强 跨导放大器 开关电容共模负反馈 版图 |
A Gain-boost Cascode Transconductance Amplifier with Improved Structure |
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| MA Lei,YUAN Yi-dong,ZHANG Hai-feng. A Gain-boost Cascode Transconductance Amplifier with Improved Structure[J]. Modern Electronic Technique, 2011, 34(10): 145-148 |
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| Authors: | MA Lei YUAN Yi-dong ZHANG Hai-feng |
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| Affiliation: | MA Lei,YUAN Yi-dong,ZHANG Hai-feng (Communication & Power Utilization Technology Branch Company of China Electric Power Research Institute,Beijing 100192,China) |
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| Abstract: | In this paper, a full differential transconductance amplifier suitable for pipelined ADC is presented. The gainboost method of the single-ended gain-boost amplifier makes the operation amplifier have a high DC gain, smaller area and better territory match in layout. By using improved CMFB circuit, the settling time and jitter of output common-mode voltage are decreased. The whole circuit was simulated with SMIC 0. 18 μm CMOS technology. The result shows that DC-gain is 119.3 dB, GBW is 378. I MHz and the phase margin is 60°. |
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| Keywords: | pipelined ADC gain-boost transconductance amplifier CMFB |
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