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A Wireless Power and Data Transfer IC for Neural Prostheses Using a Single Inductive Link With Frequency-Splitting

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    IEEE Transactions on Biomedical Circuits and Systems
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    PubMed
    Summary

    This study introduces a novel integrated circuit for simultaneous wireless power and data transfer using frequency-shift keying (FSK). It achieves high efficiency and data rates over a single inductive link.

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    Area of Science:

    • Electrical Engineering
    • Wireless Communication
    • Integrated Circuit Design

    Background:

    • Simultaneous wireless power and data transfer is crucial for many emerging applications.
    • Existing methods often face trade-offs between power delivery and data rate.
    • Inductive links are a common approach but can be limited in bandwidth and efficiency.

    Purpose of the Study:

    • To develop an integrated circuit (IC) for efficient, simultaneous wireless power and data transfer over a single inductive link.
    • To leverage frequency-splitting characteristics for enhanced performance.
    • To improve the figure of merit (FoM) for both power delivery and data transmission.

    Main Methods:

    • Utilized a frequency-splitting-based inductive link.
    • Employed frequency-shift keying (FSK) modulation for data transmission.
    • Fabricated the IC using a 180-nm BCD process.

    Main Results:

    • Achieved simultaneous wireless power delivery up to 115 mW and a downlink data rate of 2.5 Mb/s.
    • Demonstrated a maximum overall power efficiency of 56.7%.
    • Reported a bit error rate (BER) below 10-6 at 2.5 Mb/s.

    Conclusions:

    • The proposed frequency-splitting approach enables high-performance simultaneous wireless power and data transfer.
    • The developed IC significantly enhances the figure of merit for both power delivery (38.7x) and data transmission (2x) compared to prior art.
    • This technology offers a promising solution for efficient and integrated wireless power and data communication.