Pulse Oximeter Improvement with an ADC-DAC Feedback Loop and a Radial Reflectance Sensor

Author

Thompson, David ; Wareing, Austin ; Day, Dwight ; Warren, Steve

Author_Institution

Dept. of Electr. & Comput. Eng., Kansas State Univ., Manhattan, KS

fYear

2006

fDate

Aug. 30 2006-Sept. 3 2006

Firstpage

815

Lastpage

818

Abstract

Pulse oximeter circuitry must meet several design constraints, including the ability to separate a small pulsatile signal component from a large signal baseline. This paper describes pulse oximeter design changes that produced order-of-magnitude improvements in signal quality. The primary changes were (a) the replacement of an analog sample-and-hold-based differentiator circuit with an ADC-DAC feedback loop and (b) the replacement of a side-by-side reflectance sensor design with a radial sensor arrangement that maximizes the pulsatile-to-baseline signal ratio

Keywords

analogue-digital conversion; biomedical equipment; digital-analogue conversion; feedback; optical sensors; oximetry; ADC-DAC feedback loop; light-based sensor circuitry; photoplethysmogram; pulsatile-to-baseline signal ratio; pulse oximeter design; radial reflectance sensor; signal quality; Differential amplifiers; Feedback circuits; Feedback loop; Filters; Light emitting diodes; Microcontrollers; Pulse circuits; Reflectivity; Signal design; USA Councils; Light-based sensor circuitry; photoplethysmogram; pulse oximeter; reflectance;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE

Conference_Location

New York, NY

ISSN

1557-170X

Print_ISBN

1-4244-0032-5

Electronic_ISBN

1557-170X

Type

conf

DOI

10.1109/IEMBS.2006.259501

Filename

4461876