A Low-Power, Single-Chip Electronic Skin Interface for Prosthetic Applications.

Area of Science:

• Biomedical Engineering
• Materials Science
• Electrical Engineering

Background:

• Commercial electronic skin interfaces are often bulky and power-intensive.
• Advanced prosthetics require compact, low-power solutions for tactile feedback.
• Existing systems limit the development of nimble and responsive prosthetic limbs.

Purpose of the Study:

• To develop a low-power, single-chip electronic skin interface for advanced prosthetic applications.
• To reduce the physical footprint and power consumption of electronic skin systems.
• To enable real-time tactile feedback in prosthetic devices.

Main Methods:

• Implemented a system on chip (SoC) integrating analog front ends (AFEs) and a 16-bit microcontroller.
• Utilized an event-driven architecture for energy-efficient channel monitoring.
• Fabricated a test chip in 0.13 μm CMOS technology and interfaced it with polyvinylidene fluoride (PVDF) piezoelectric sensors.

Main Results:

• The single-chip system demonstrated effective measurement and on-chip processing of tactile signals.
• Achieved low power consumption: 7.0 μW per channel and 93.5 μW for the example application at 1 Hz.
• The system successfully calculated charge from PVDF sensor inputs using a custom software algorithm.

Conclusions:

• The developed low-power, single-chip electronic skin interface is suitable for battery-powered advanced prosthetics.
• The system's flexibility allows interfacing with various sensor types.
• This technology facilitates the creation of more nimble prosthetic limbs with enhanced tactile sensing capabilities.