©ISTOCKPHOTO.COM/MARINA_UA Feature CMOS Transimpedance Amplifiers for Biomedical Applications: A Comparative Study Ahmed Atef, Mohamed Atef, Elsayed Esam M. Khaled, and Mohamed Abbas Digital Object Identifier 10.1109/MCAS.2019.2961724 Date of current version: 11 February 2020 12 IEEE CIRCUITS AND SYSTEMS MAGAZINE Abstract Recently, different medical devices have emerged and utilized in a numerous health care fields such as pulse oximetry, cuffless blood pressure using Photoplethysmogram (PPG), noninvasive blood glucose measuring, and Near Infrared Spectroscopy (NIRS). Those devices are very similar in their analog front end circuit which is a transimpedance amplifier (TIA). Many different TIA topologies have appeared in different optoelectronic fields which make the choice 1531-636X/20©2020IEEE FIRST QUARTER 2020http://www.ISTOCKPHOTO.COM/MARINA_UA