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A Millimeter-Scale Crystal-Less MICS Transceiver for Insertable Smart Pills.

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    This study introduces a compact, crystal-less wireless transceiver for ingestible pills, enabling reliable in-body communication. Its adaptive antenna matching ensures consistent performance across various physiological conditions.

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    Area of Science:

    • Biomedical Engineering
    • Wireless Communication Systems
    • Integrated Circuit Design

    Background:

    • Insertable medical devices require miniaturized, low-power wireless transceivers for in-body communication.
    • Antenna impedance variations within the human body pose a significant challenge for reliable wireless data transmission.

    Purpose of the Study:

    • To develop a millimeter-scale, crystal-less wireless transceiver for ingestible pill applications.
    • To address the challenge of variable antenna impedance in-body through an adaptive matching solution.

    Main Methods:

    • A phase-tracking receiver for over-the-air carrier recovery in the MICS band (402-405 MHz).
    • A fully integrated adaptive antenna impedance matching network (TMN) with a single inductor for TX/RX modes.
    • A loop-back power detector with self-mixing for dynamic calibration against VSWR up to 4.8.

    Main Results:

    • The transceiver was fabricated using 40-nm CMOS, occupying a 2 mm² die area.
    • A prototype module (3.5 × 15 mm²) integrated the chip and antenna.
    • Achieved receiver sensitivity of -90 dBm at 200 kbps and -25 dBm EIRP in phantom measurements.

    Conclusions:

    • The developed transceiver offers a viable solution for volume-constrained insertable medical devices.
    • The adaptive impedance matching system effectively compensates for in-body antenna variations.
    • This technology enables robust wireless communication for ingestible diagnostic and therapeutic systems.