论文信息 - A 1-V 1.1-μW sensor interface IC for wearable biomedical devices

A 1-V 1.1-μW sensor interface IC for wearable biomedical devices

An ultra-low-power, low-noise sensor interface IC dedicated for bio-signal acquisition is presented in this paper. The proposed system architecture is optimized to achieve a better trade-off between power consumption and noise figure. A 0.05 ~ 200 Hz bandpass function is embedded within the front-end amplifier, and a wide bandwidth buffer is inserted between the front-end amplifier and ADC to facilitate a power-efficient interface. The system also includes an 11-bit SAR ADC with nonlinearity of less than plusmn0.7 LSB. The measured input-referred noise is 2.1 muV integrated across the pass-band, achieving noise efficiency factor of 2.9, and the power consumption for the overall system is 1.1 muW under 1 V supply.

Jun Tan | Yong Lian | Libin Yao | Xiaodan Zou | Xiaoyuan Xu

[1] R. R. Harrison,et al. A low-power low-noise CMOS amplifier for neural recording applications , 2003, IEEE J. Solid State Circuits.

[2] R. Jacob Baker,et al. CMOS Circuit Design, Layout, and Simulation , 1997 .

[3] Jens Sauerbrey,et al. A 0.5-V 1-μW successive approximation ADC , 2003, IEEE J. Solid State Circuits.

[4] Maysam Ghovanloo,et al. A Low-Noise Preamplifier with Adjustable Gain and Bandwidth for Biopotential Recording Applications , 2007, 2007 IEEE International Symposium on Circuits and Systems.

[5] J. Ramirez-Angulo,et al. A low-voltage low-power QFG-based Sigma-Delta modulator for electroencephalogram applications , 2006, 2006 IEEE Biomedical Circuits and Systems Conference.

[6] Honglei Wu,et al. A 1V 2.3µW Biomedical Signal Acquisition IC. , 2006 .

[7] W.M.C. Sansen,et al. A micropower low-noise monolithic instrumentation amplifier for medical purposes , 1987 .