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Programmable ExG biopotential front-end IC for wearable applications.

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    IEEE Transactions on Biomedical Circuits and Systems
    |July 30, 2014
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    This study introduces a flexible CMOS integrated circuit front-end for recording various biopotentials (ExG), like ECG and EMG. The configurable design offers adjustable gain and selectable input stages, ideal for wearable physiological sensing.

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    Area of Science:

    • Integrated Circuit Design
    • Biomedical Engineering
    • Wearable Technology

    Background:

    • Biopotential signal recording is crucial for physiological monitoring.
    • Existing systems often lack configurability and flexibility for diverse applications.
    • Wearable devices require low-power, high-performance front-end electronics.

    Purpose of the Study:

    • To present a configurable CMOS integrated circuit front-end for recording a wide range of biopotentials (ExG).
    • To demonstrate the chip's suitability for long-term wearable physiological sensing applications.

    Main Methods:

    • Designed and fabricated a configurable CMOS integrated circuit front-end.
    • Utilized a 0.35 μm CMOS technology.
    • Implemented selectable single-differential or double-differential recording topologies, adjustable gain (37-66 dB), and selectable CMOS/BJT input stages.

    Main Results:

    • Achieved a Common-Mode Rejection Ratio (CMRR) > 97 dB.
    • Measured an input-referred noise of 21 nV/√Hz.
    • Demonstrated successful recording of electrocardiogram (ECG) and electromyogram (EMG) signals.
    • Chip power consumption ranges from 110 to 324 μW with a core area of 0.16 mm².

    Conclusions:

    • The configurable CMOS front-end effectively records diverse biopotentials (ExG).
    • The chip's low power consumption and high performance make it suitable for wearable physiological sensing.
    • Integration with microcontrollers enables long-term health monitoring applications.