摘要
基于SMIC 0.18μm CMOS工艺,设计了一种用于电生理信号监测的低功耗、低噪声仪表放大器。采用两级放大结构和斩波技术,减小了低频闪烁噪声。引入波纹抑制负反馈环路,减小了斩波带来的波纹噪声。采用积分负反馈直流失调抑制(DCOC)环路,减小了电路的失调。采用自举技术,增大了电路的输入阻抗。该电路的功耗仅为600nW,带内(0.5~500Hz)噪声小于200nV/Hz^(1/2),CMRR大于105dB,输入阻抗大于500 MΩ。
A low power,low noise instrument amplifier for biomedical signal monitoring was designed in the SMIC 0.18μm CMOS process.A two-stage structure and a chopping technique were used to reduce the flicker noise.A ripple rejection negative feedback loop was introduced to reduce the chopping ripple.In addition,a switched-capacitor integrator was employed for DC offset cancellation（DCOC）loop.A bootstrap technique was used to increase the input impedance.The proposed circuit only consumed 600 nW.The in-band（0.5-500 Hz）input-referred noise density was lower than 200 nV/Hz^（1/2）.The CMRR was larger than 105 dB,and the input impedance was larger than 500 MΩ.
作者
陈就
王小松
张海英
刘昱
CHEN Jiu WANG Xiaosong ZHANG Haiying LIU Yu(R＆D Center of Health Care Electronics, IMECAS, Beijing 100029, P. R. China Beijing Key Laboratory of Radio Frequency IC Technology for Next Generation Communications, IMECAS, Beijing 100029, P. R. China School of Future Technology, University of Chinese Academy of Sciences, Beijing 101400, P. R. China)
出处
《微电子学》
CSCD
北大核心
2017年第5期593-596,共4页
Microelectronics
