| 一种快速全差分CMOS运算放大器 |
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| 引用本文： | 林武平,郭良权,李亮,黄召军.一种快速全差分CMOS运算放大器[J].电子与封装,2008,8(12):20-23. |
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| 作者姓名： | 林武平 郭良权 李亮 黄召军 |
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| 作者单位： | [1]江南大学,江苏无锡214122; [2]中国电子科技集团第58研究所,江苏无锡214000 |
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| 摘 要： | 文章在CSMC0．5μm／5V硅CMOS工艺模型下，设计了一种用于电表计量芯片的全差分运算放大器。该运放采用两级结构，其中第一级为折叠式共源共栅结构，第二级为PMOS输出缓冲结构。文章采用开关电容技术实现共模反馈以稳定输出共模电压，跟传统方法相比，这将能降低芯片面积及降低功耗。采用HSPICE软件对该电路进行仿真，仿真结果表明在负载电容为2pF情况下，该运算放大器具有开环增益为84．7dB、单位增益带宽达44．8MHz、相位裕度为67°、闭环小信号建立时间为39ns。
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| 关 键 词： | 全差分 折叠式共源共栅 共模反馈 CMOS |
A High-Speed Fully Differential CMOS Op-Amp |
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| LIN Wu-ping,GUO Liang-quan,LI Liang,HUANG Zhao-jun.A High-Speed Fully Differential CMOS Op-Amp[J].Electronics & Packaging,2008,8(12):20-23. |
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| Authors: | LIN Wu-ping GUO Liang-quan LI Liang HUANG Zhao-jun |
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| Affiliation: | LIN Wu-ping, GUO Liang-quan, LI Liang, HUANG Zhao-jun (1.Jiangnan University, Wuxi 214122, China; 2.No.58 Research Institute of China Electronics Technology Group Corporation, Wuxi 214000, China) |
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| Abstract: | Based on CSMC 0.5μm/5V Si CMOS technology, a high-speed fully differential operational amplifier used in energy metering IC was designed. In this OPA a two-stage structure consisting of a folded cascade amplifier and a PMOS output-buffer was adopted.In order to output a stable common-mode, switched capacitor common-mode feedback technique is used. Compare to traditional technique ,it can reduce the chip area and power consumption. And it is simulated with HSPICE software, results show that with a 2pF capacitor load it has an open loop gain of 84.7dB ,a unit gain bandwidth of 44.8MHz, a phase margin of 67°, and the settling time is 39ns. |
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| Keywords: | CMOS |
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