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Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
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An Integrated Wireless Power Management and Data Telemetry IC for High-Compliance-Voltage Electrical Stimulation

Jianming Zhao, Lei Yao, Rui-Feng Xue

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    Summary
    This summary is machine-generated.

    This study presents a wireless power recovery system for neural stimulators, achieving 49% peak efficiency. It enables efficient power delivery and bidirectional data communication for advanced medical devices.

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    Area of Science:

    • Electrical Engineering
    • Biomedical Engineering
    • Integrated Circuit Design

    Background:

    • Neural and muscle stimulators require efficient wireless power transfer and bidirectional data communication.
    • Existing systems face challenges in providing multiple stable DC outputs and high data rates.
    • High-compliance-voltage applications necessitate robust power management and reliable telemetry.

    Purpose of the Study:

    • To develop a 13.56-MHz wireless power recovery system with a bidirectional data link for high-compliance-voltage neural/muscle stimulators.
    • To achieve simultaneous and efficient generation of multiple DC power outputs (1.8 V, 3.3 V, 20 V).
    • To enhance power efficiency and data telemetry performance for implantable medical devices.

    Main Methods:

    • A 2-stage rectifier and a modified low-ripple charge pump were designed to generate three DC outputs.
    • A 2-stage time-division-based rectifier was implemented for simultaneous power output.
    • Bidirectional data telemetry was achieved using a clock and data recovery (CDR) circuit and a load shift keying (LSK) modulator.
    • The system was fabricated using a 24 V HV LDMOS 1.8 μm CMOS process.

    Main Results:

    • The power recovery circuit achieved a peak power efficiency of 49%.
    • The modified charge pump reduced output ripple voltage by 40% for the 20 V supply.
    • Forward and backward data telemetry rates reached 61.5 kbps and 33.3 kbps, respectively.
    • The integrated system occupied a core area of approximately 3.5 mm².

    Conclusions:

    • The developed wireless power recovery system effectively meets the power and data communication needs of high-compliance-voltage neural/muscle stimulators.
    • The proposed 2-stage rectifier and modified charge pump offer significant improvements in power efficiency and output stability.
    • This integrated system demonstrates a viable solution for advanced implantable neuromodulation devices.