Search

In order to care and prevent diabetes, continuous glucose monitoring (CGM) is considerably important [1]. However, existing needle-type glucose monitoring systems [2] are painful, thus unsuitable for preventing applications. In order to address this issue, a needle-less and pain-free CGM contact lens has been developed [3]. Since tear glucose level has high correlation with blood glucose level, it can be expected to be future de facto standard CGM. However, the existing CGM contact lens is based on RFID technology associated with the dedicated smart glasses, which degrade the patients' comfort and cost too much.

This work presents world's lowest power consumption sub-mm2supply-modulated CMOS OOK transmitter for enabling self-powered continuous glucose monitoring contact lens. By introducing self-oscillating voltage doubler and charge pump, compact, low-voltage, low-power supply-modulated OOK transmitter become available. By prototyping 385 μm × 385 μm testchip in 65nm standard CMOS technology, 0.27 nW under 0.165 V performance and self-powered operation using 2 mm × 2 mm solid-state glucose fuel cell were sucessfully demonstrated.