A Solar-Cell-Assisted, 99% Biofuel Cell Area Reduced, Biofuel-Cell-Powered Wireless Biosensing System in 65nm CMOS for Continuous Glucose Monitoring Contact Lenses

Abstract

This brief proposes a solar-cell-assisted wireless biosensing system that operates using a biofuel cell (BFC). To facilitate BFC area reduction for the use of this system in area-constrained continuous glucose monitoring contact lenses, an energy harvester combined with an on-chip solar cell is introduced as a dedicated power source for the transmitter. A dual-oscillator-based supply voltage monitor is employed to convert the BFC output into digital codes. From measurements of the test chip fabricated in 65-nm CMOS technology, the proposed system can achieve 99% BFC area reduction.

A CMOS Temperature Sensor with On‐chip Photovoltaic Cells

“…As a step toward putting this attractive technology to practical use, I have developed a temperature sensor with an on-chip power generation function. Methods using photodiodes have been proposed for on-chip power generation [6][7][8][9]. References [7] and [8] successfully drive a ring oscillator with on-chip power generation.…”

“…References [7] and [8] successfully drive a ring oscillator with on-chip power generation. Reference [9] uses an off-chip biofuel cell as the main power source and an on-chip photovoltaic cell as an assist. Driving a practical temperature sensor with only on-chip power generation is a new proposal in this article.…”