摘要
介绍了一种基于SMIC 0.18μm CMOS工艺的低噪声、宽输入摆幅的仪表放大器设计.本文采用电流反馈型仪表放大器结构,通过改进整体电路结构,实现了很高的电极失调抑制能力,采用斩波技术减小低频闪烁噪声,采用直流抑制环路(DCOC)减小电路的失调.该电路的电源电压为1.2V,功耗为56μW,等效带内输入噪声密度小于200nV/√Hz,电极失调抑制可达±300mV,CMRR大于110dB,输入阻抗大于1GΩ.
A low-noise, high input-swing instrument amplifier for biopotential monitoring based on 0. 18μm CMOS IC process is presented. This circuit is a current feedback amplifier, by improving the overall circuit structure, to achieve a very high electrode offset suppression. The circuit uses chopping technique to reduce flicker noise and uses DC offset cancellation loop to reduce amplifier offset. The proposed circuit consumes 56 μW from a 1.2 V supply, with in-band input-referred voltage noise density lower than 200 nV/√Hz, CMRR larger than 110 dB, ±300 mV electrode offset suppression and input impedance larger than 1 GΩ.
出处
《微电子学与计算机》
CSCD
北大核心
2017年第12期40-44,共5页
Microelectronics & Computer
