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Related Experiment Video

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A CMOS Current Steering Neurostimulation Array With Integrated DAC Calibration and Charge Balancing.

Elliot Greenwald, Christoph Maier, Qihong Wang

    IEEE Transactions on Biomedical Circuits and Systems
    |January 17, 2017
    PubMed
    Summary

    This study presents an 8-channel neural stimulator for precise charge balancing. Its current steering capabilities enable adaptive stimulation in neural interfaces, even with varying electrode and tissue conditions.

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    Area of Science:

    • Biomedical Engineering
    • Neuroscience
    • Electrical Engineering

    Background:

    • Precise charge balancing is critical for safe and effective neural stimulation.
    • Existing neural stimulators often lack adaptability to changing physiological conditions.

    Purpose of the Study:

    • To develop an 8-channel neural stimulator with on-chip calibration for precise charge balancing.
    • To enable adaptive and spatially controlled current steering for targeted neural interfaces.

    Main Methods:

    • An 8-channel stimulator design featuring sub-binary radix DACs and current buffers.
    • On-chip integrator for DAC calibration and phase matching.
    • Digital programming for current steering and spatial profile alteration.

    Main Results:

    • Achieved differential non-linearity within ±0.3 LSB at 8-bit resolution.
    • Matched anodic and cathodic stimulation phases within 0.3%.
    • Demonstrated current steering stimulation in a rat sciatic nerve model.

    Conclusions:

    • The developed neural stimulator offers precise charge balancing and adaptive stimulation capabilities.
    • On-chip calibration and current steering support autonomous operation in implanted neural interfaces.
    • This technology holds promise for advanced neuroprosthetics and therapeutic applications.