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一种适用于传感器信号检测的斩波运算放大器 被引量：11

A Chopper-Stabilized Operational Amplifier for Sensor Signal Detection
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摘要 提出一种适合传感器微弱信号检测应用的全差分低噪声、低失调斩波运算放大器。采用两级折叠共源共栅运放结构,基于斩波稳定及动态元件匹配技术,通过在运放低阻节点的电流通路上添加斩波开关的设计方式,增加了运放的输入信号带宽和输出电压摆幅。芯片采用TSMC 0.18μm 1P6MCMOS工艺实现。测试结果表明,在1.8V电源电压,25kHz输入信号和300kHz斩波频率下,斩波运放输入等效失调电压小于120μV,在10Hz～1kHz之间,输入等效噪声为5nV/Hz^(1/2),最高开环增益为84dB,单位增益带宽为4MHz。 A two-stage full differential chopper-stabilized operational amplifier for sensor signal detection was presented based on chopper stabilizing and dynamic matching techniques.In this OPA,a two-stage folded-cascode operational amplifier was adopted and a chopper switch was used at low resistance node in the current path to improve the sensor signal bandwidth and output voltage swing.The OPA was implemented in TSMC 0.18 μm 1P6M CMOS process.Test results showed that the circuit had an input residual offset of 120 μV,and an input noise of 5 nV/Hz^（1/2） between 10 Hz and 1 kHz,with a maximum open-loop gain of 84 dB and a GBW of 4 MHz,for 1.8 V power supply,25 kHz input frequency and 300 kHz chopper frequency.
作者 陈铖颖 黑勇 胡晓宇
机构地区 中国科学院微电子研究所
出处 《微电子学》 CAS CSCD 北大核心 2012年第1期17-20,24,共5页 Microelectronics
基金 中国科学院知识创新工程"多传感器集成与节点核心芯片"项目(Y0YF052001)
关键词 传感器检测 斩波运放 低噪声 低失调 Sensor signal detection Chopper-stabilized operational amplifier Low noise Low residual offset
分类号 TN722 [电子电信—电路与系统]
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参考文献3

二级参考文献24

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共引文献34

同被引文献81

  • 1杨银堂,贺斌,朱樟明.CMOS斩波稳定放大器的分析与研究[J].电子器件,2005,28(1):167-171. 被引量：14
  • 2宋奇伟,张正平.一种新型高速CMOS全差分运算放大器设计[J].现代电子技术,2012,35(4):166-168. 被引量：4
  • 3尹韬,杨海钢,刘珂.一种适用于微传感器读出电路的低噪声、低失调斩波放大器[J].Journal of Semiconductors,2007,28(5):796-801. 被引量：19
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引证文献11

二级引证文献24

微电子学
2012年 第1期

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