Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2008
Session Number:P1
Session:
Number:P1-35
Design and Layout of CMOS Interface Circuit for Measuring Photoplethysmogram
Woo Ram Lee, Wan Jik Lee, Chang Soo Won, Sang Hee Son, Won Sup Chung, Kyoung Rok Cho,
pp.-
Publication Date:2008/7/7
Online ISSN:2188-5079
Summary:
A CMOS interface circuit for measuring PPG(Photoplethysmogram) is proposed and designed by using current-control Schmitt trigger in this paper,. This circuit detects the blood beat using PPG which occurs in bloodbeat sensor and composed of analog and digital parts. Current signal of sensor is converted into voltage in analog parts and then converted into digital signal in digital parts. Compared to the conventional method, operation speed is increased and linear error is diminished by applying OTA(Operational transconductance amplifier) to Schmitt trigger circuit and oscillator. Also, proposed and designed circuit has some features of low power consumption, simple structure and high resolution compared with previous method.