Abstract: Continuous monitoring of arterial carbon dioxide is critical for assessing respiratory function and detecting ventilation inefficiencies. Arterial blood gas analysis, the clinical gold standard, is invasive and limited to intermittent measurements in hospital settings. Transcutaneous carbon dioxide sensing offers a noninvasive alternative by measuring carbon dioxide diffusing through the skin, which strongly correlates with arterial carbon dioxide. However, conventional transcutaneous sensors require bulky bedside monitors and heating elements, making them unsuitable for wearable applications. This work presents the first integrated circuit implementation of a ratiometric time-domain dual lifetime referencing technique using a direct current-to-digital converter architecture designed for energy-efficient wearables.
Bio: Tuna B. Tufan received the B.Sc. degree in electrical and electronics engineering from Middle East Technical University, Ankara, Türkiye, in 2020, and the M.Sc. degree in electrical and computer engineering from Worcester Polytechnic Institute, Worcester, MA, USA, in 2022, where he is currently pursuing the Ph.D. degree with the Integrated Circuits and Systems (ICAS) Lab. He interned with Analog Devices as a Mixed-Signal Design Engineer during the summer of 2022. His Ph.D. research focuses on the analog and mixed-signal design for wearable, noninvasive sensors for monitoring respiratory functions.