A CMOS Wearable Infrared Light Intensity Digital Converter for Monitoring Unplanned Self-Extubation of Patients

This paper proposes a complementary metal oxide semiconductor wearable infrared (IR) light intensity digital converter for monitoring the unplanned self-extubation of patients. The proposed converter could process the IR light intensity without limitations of the field-of-view and is immune to ambient optical noise. Furthermore, the output of the proposed converter can be easily transmitted to Internet of things devices. The sensing area of a monolithic photodiode was 120× 120 μm
²
, and the complete size of the chip was 1.21×2.04 mm
²
. The measured distance between an IR light source and the proposed converter was 15-29 cm, and the measured signal-to-noise-distortion ratio was corresponding to 80.9-74.9 dB. Finally, an experiment was conducted for monitoring the unplanned self-extubation of patients. The results indicate that the proposed chip is suitable for usage in medical institutions.