| 嵌套式斩波运放的分析与设计 |
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| 引用本文： | 张锗源,杨发顺,杨法明,张荣芬,邓朝勇.嵌套式斩波运放的分析与设计[J].微电子学,2012,42(1):25-29,33. |
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| 作者姓名： | 张锗源 杨发顺 杨法明 张荣芬 邓朝勇 |
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| 作者单位： | 贵州大学理学院贵州省微纳电子与软件技术重点实验室,贵阳,550025 |
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| 基金项目： | 贵州省科学技术基金，贵州省优秀青年科技人才，贵州省高层次人才基金 |
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| 摘 要： | 针对传统的斩波运放具有大残余失调的特点,设计了一个嵌套式斩波运放。基于SMIC0.18μm工艺,通过Spectre仿真工具进行验证与仿真,运放的开环增益达到78.3dB,共模抑制比达到112dB。在斩波频率fchophigh=10kHz、fchoplow=500Hz的条件下,通过使用非匹配斩波开关,分别对单斩波和嵌套式斩波运放进行仿真。结果表明,嵌套式斩波技术能有效减小残余失调的影响。适用于带宽较低的微弱信号检测与处理电路,如传感器前端读出电路和音频信号放大电路等。
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| 关 键 词： | 嵌套式 斩波运放 残余失调 纹波 |
Analysis and Design of Nested Chopper Operational Amplifier |
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| ZHANG Zheyuan
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YANG Fashun
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YANG Faming
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ZHANG Rongfen
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DENG Chaoyong.Analysis and Design of Nested Chopper Operational Amplifier[J].Microelectronics,2012,42(1):25-29,33. |
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| Authors: | ZHANG Zheyuan YANG Fashun YANG Faming ZHANG Rongfen DENG Chaoyong |
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| Institution: | (Prov.Key Lab of Micro-Nano Electronics and Software Technology,College of Sciences,Guizhou Univ.,Guiyang 550025,P.R.China) |
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| Abstract: | A nested chopper operational amplifier was designed to solve the problem of large residual offset in traditional chopper amplifiers.Simulation with Spectre based on SMIC 0.18 μm CMOS process showed that the circuit had an open loop gain of 78.3 dB and a CMMR up to 112 dB.With chopper frequency fchophigh=10 kHz and fchoplow=500 Hz,the single chopper and nested chopper opamp were simulated,respectively,using non-matched chopper switch.Results indicated that the nested chopper was helpful to reduce residual offset.The nested chopper opamp is suitable for processing weak signal with low bandwidth,such as front-end readout circuit in sensors and audio signal amplifier circuit. |
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| Keywords: | Nested Chopper opamp Residual offset Ripple |
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