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Wirelessly Powered and Bi-Directional Data Communication System With Adaptive Conversion Chain for Multisite

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    This study presents a novel wireless power and data system for multiple implanted biomedical devices. It achieves efficient, safe operation using dual-band coils and advanced control, reaching a 31.2% power transfer efficiency.

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    Area of Science:

    • Biomedical Engineering
    • Electrical Engineering
    • Implantable Devices

    Background:

    • Wireless power transfer is crucial for implantable biomedical devices.
    • Existing systems face challenges in efficiency and multi-site communication.

    Purpose of the Study:

    • To develop a full wireless power and data communication system for multisite implanted biomedical applications.
    • To enhance power transfer efficiency (PTE) and ensure safe operation.

    Main Methods:

    • Utilized dual-band coils for separate wireless power and data reception per implant.
    • Implemented bi-directional half-duplex communication using amplitude and load shift keying (ASK and LSK) modulation.
    • Employed a digitally assisted active rectifier, automatic resonance tuning, and a closed-loop power control unit.

    Main Results:

    • Achieved separate wireless power and data communication for each implant using different resonance frequencies.
    • Demonstrated bi-directional communication with ASK and LSK modulation over a single inductive link.
    • Maximized overall PTE to 31.2% from the transmitter coil to the implant load.
    • Integrated a novel self-sampling separated- Vb ASK demodulator for data conversion.

    Conclusions:

    • The developed system offers a robust solution for wirelessly powering and communicating with multisite implanted biomedical devices.
    • The system's design ensures efficient power transfer, safe operation, and reliable data communication.
    • Fabricated using a standard 180-nm CMOS process, the system demonstrates practical feasibility for biomedical applications.