A 143nW Glucose-Monitoring Smart Contact Lens IC with a Dual-Mode Transmitter for Wireless-Powered Backscattering and RF-Radiated Transmission Using a Single Loop Antenna

Abstract

This paper presents a smart contact lens (SCL) controller IC with a high-precision current sensor interface and a dual-mode wireless telemetry, where a single power-oscillator-based circuit with an external loop antenna supports both LSK and RF data transmission. The implemented IC in $0.18 \mu m$ CMOS, achieving a dynamic conversion range of 89 dB while dissipating 143 nW, is verified in a glucose-sensing SCL system.