| 一种高增益三级运算放大器 |
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| 引用本文： | 王鹏,汪涛,丁坤,易茂祥.一种高增益三级运算放大器[J].微电子学,2018,48(5):579-584. |
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| 作者姓名： | 王鹏 汪涛 丁坤 易茂祥 |
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| 作者单位： | 合肥工业大学 电子科学与应用物理学院, 合肥 230009,合肥工业大学 电子科学与应用物理学院, 合肥 230009,合肥工业大学 电子科学与应用物理学院, 合肥 230009,合肥工业大学 电子科学与应用物理学院, 合肥 230009 |
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| 基金项目： | 国家自然科学基金资助项目(61371025)；合肥工业大学博士专项基金资助项目(JZ2015HGBZ0462)；安徽省质量工程项目(2017jyxm0037) |
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| 摘 要： | 提出了一种高增益三级运算放大器。采用五管全差分、套筒式共源共栅、典型共源级结构作为运算放大器的放大级,采用共模抑制电路、频率补偿电路、高摆幅偏置电路,提高了运算放大器的性能。结果表明,在3 V电源电压、4 pF负载电容的条件下,该运算放大器的开环直流增益为155 dB,单位增益带宽为112 MHz,相位裕度为84.1°,电源抑制比为151 dB,共模抑制比为-168 dB。该运算放大器的补偿电容较小,节省了面积。
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| 关 键 词： | 运算放大器 全差分 套筒式共源共栅 共模抑制 |
| 收稿时间： | 2017/12/5 0:00:00 |
A High Gain Three Stage Operational Amplifier |
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| WANG Peng,WANG Tao,DING Kun and YI Maoxiang.A High Gain Three Stage Operational Amplifier[J].Microelectronics,2018,48(5):579-584. |
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| Authors: | WANG Peng WANG Tao DING Kun and YI Maoxiang |
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| Affiliation: | School of Electronic Science & Applied Physics, Hefei University of Technology, Hefei 230009, P. R. China,School of Electronic Science & Applied Physics, Hefei University of Technology, Hefei 230009, P. R. China,School of Electronic Science & Applied Physics, Hefei University of Technology, Hefei 230009, P. R. China and School of Electronic Science & Applied Physics, Hefei University of Technology, Hefei 230009, P. R. China |
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| Abstract: | A high gain three stage operational amplifier was proposed. The amplification stage of the amplifier was composed of five transistor full-differential, telescopic cascode and typical common source circuits, and the performance of the amplifier was greatly improved by the design of CMRR, frequency compensation and high swing bias circuits. The simulation results showed that the open-loop dc gain of the amplifier was 155 dB, the unity gain-bandwidth was 112 MHz, the phase margin was 84.1°, with the PSRR and the CMRR of 151 dB and -168 dB respectively when the supply voltage was 3 V and the capacitance was 4 pF. Due to the small compensated capacitor of the amplifier, the layout area of the amplifier could also be reduced significantly. |
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