| 全差分运算放大器中共模稳定性的分析 |
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| 引用本文： | 汤益明,万培元,郭乐乐,郎伟,林平分.全差分运算放大器中共模稳定性的分析[J].中国集成电路,2012(5):22-25. |
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| 作者姓名： | 汤益明 万培元 郭乐乐 郎伟 林平分 |
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| 作者单位： | 北京工业大学北京市嵌入式系统重点实验室,北京,100124 |
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| 摘 要： | 本文提出了用在增益可调放大器中,差分电压放大器中共模反馈稳定性的分析。本文分析了在差模运算放大器中内部共模反馈电路(CMFB)和外部由电阻构成的正反馈网络。共模反馈电路用来确保运算放大器的稳定性,外部的正反馈网络需要留心防止"锁死状态"。本文的运放采用折叠式共源共栅结构,用SMIC0.18μm混合信号工艺进行流片。
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| 关 键 词： | 差分运算放大器 共模反馈(CMFB) 正(负)反馈 两个反馈环路 锁死状态 |
Common Mode Stability in fully differential Operational Amplifiers |
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| TANG Yi-ming,WAN Pei-yuan,GUO Le-le,LANG Wei,LIN Ping-fen.Common Mode Stability in fully differential Operational Amplifiers[J].China Integrated Circuit,2012(5):22-25. |
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| Authors: | TANG Yi-ming WAN Pei-yuan GUO Le-le LANG Wei LIN Ping-fen |
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| Affiliation: | (Beijing Embedded System Key Lab, Beijing University of Technology, Beijing 100124, China) |
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| Abstract: | Design considerations are presented for stabilizing the common-mode feedback （ CMFB ） loop in fully differential voltage feedback CMOS amplifiers used in programmable gain Control amplifiers. After considerations in designing a balanced differential operational amplifier, internal CMFB circuitry and external feedback network are investigated. The former insures the amplifier stay stability, and the latter should be carefully to avoid ＇latching states＇ . cascade circuit implemented in 0.18urn CMOS mixed signal process of SMIC is presented, based on a folded topology |
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| Keywords: | Differential Op-amp Common mode feedback （ CMFB ） Positive （ negative ） feedback Two feedback loops Latching state |
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