2nd International ICST Conference on Body Area Networks

Research Article

A low power sensor interface IC for wearable wireless biomedical devices

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  • @INPROCEEDINGS{10.4108/bodynets.2007.94,
        author={Xiaodan Zou and Xiaoyuan Xu and Yong Lian and Yuanjin Zheng},
        title={A low power sensor interface IC for wearable wireless biomedical devices},
        proceedings={2nd International ICST Conference on Body Area Networks},
        publisher={ICST},
        proceedings_a={BODYNETS},
        year={2007},
        month={6},
        keywords={Biomedical circuits and systems wireless biomedical device biosignal acquisition unit.},
        doi={10.4108/bodynets.2007.94}
    }
    
  • Xiaodan Zou
    Xiaoyuan Xu
    Yong Lian
    Yuanjin Zheng
    Year: 2007
    A low power sensor interface IC for wearable wireless biomedical devices
    BODYNETS
    ICST
    DOI: 10.4108/bodynets.2007.94
Xiaodan Zou1,*, Xiaoyuan Xu1,*, Yong Lian1,*, Yuanjin Zheng2,*
  • 1: Dept of ECE National University of Singapore 4 Engineering Drive 3 Singapore 117576
  • 2: Institute of Microelectronics 11 Science Park Road Singapore Science Park II Singapore 117685
*Contact email: xiaodan@nus.edu.sg, elexxy@nus.edu.sg, eleliany@nus.edu.sg, yuanjin@ime.a-star.edu.sg

Abstract

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].