A Light Tolerant Neural Recording IC for Near-Infrared-Powered Free Floating Motes.

Area of Science:

• Biomedical Engineering
• Neuroscience
• Integrated Circuit Design

Background:

• Near-infrared (NIR) powered neural recording integrated circuits (ICs) face challenges with parasitic short-circuit currents from junction diodes under light exposure.
• Minimizing power consumption in these ICs is crucial for standalone applications, but often conflicts with the need for robust operation.

Purpose of the Study:

• To develop a neural recording IC with enhanced tolerance to light exposure.
• To achieve ultra-low power consumption for standalone neural recording systems.
• To integrate on-chip feature extraction and individual gain control.

Main Methods:

• Design and fabrication of a novel neural recording integrated circuit.
• Testing the IC's operational robustness under varying levels of near-infrared light exposure.
• Measurement of power consumption and performance metrics including feature extraction and gain control.

Main Results:

• The developed neural recording IC demonstrates tolerance to light exposure up to 300 μW/mm², exceeding typical tissue limits.
• The IC achieves an ultra-low power consumption of 0.57 μW at 38°C.
• The design incorporates on-chip feature extraction and individual gain control capabilities.

Conclusions:

• The presented neural recording IC offers a robust and power-efficient solution for advanced neural recording applications.
• This technology enables lower power consumption in standalone neural recording motes.
• The integrated features enhance the utility of the IC for complex neural interface systems.