A low power sensor interface IC for wearable wireless biomedical devices

This paper presents a low power, low noise CMOS front-end IC for wearable biomedical sensor devices used in wireless body area network. The IC includes a rail-to-rail low noise amplifier (LNA), a unity gain buffer, and a 12-bit analog-to-digital converter (ADC), which is able to acquire biomedical signals in the range of few μV to 10 mV. The overall system operates under 1V supply voltage, provides 40dB midband gain with 2.4μVrms input referred noise integrated from 0.04Hz to 250Hz, and consumes 1.4μW when implemented in standard 0.35μm CMOS process. The low power is achieved through a newly introduced system architecture that significantly reduces the clock frequency of ADC compared to the design in [4].

[1]  P. K. Chan,et al.  A CMOS analog front-end IC for portable EEG/ECG monitoring applications , 2005, IEEE Transactions on Circuits and Systems I: Regular Papers.

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

[3]  Yong Ping Xu,et al.  A 1V 2.3/spl mu/W Biomedical Signal Acquisition IC , 2006, 2006 IEEE International Solid State Circuits Conference - Digest of Technical Papers.

[4]  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.