Design and test of a 915MHz, RFID-based pressure sensor for Glaucoma

Author

Faul, Andre ; Naber, John

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Louisville, Louisville, KY, USA

fYear

2014

fDate

25-28 Feb. 2014

Firstpage

1

Lastpage

4

Abstract

A Radio Frequency Identification (RFID)-based pressure sensing system is developed to extend the range of current Intra-Ocular Pressure (IOP) sensing systems. The system described in this work utilizes a unique Electrically Small Antenna (ESA) that measures 7mm × 10mm to receive a 915MHz signal used to power the system. A four-stage Schottky rectifier circuit is used to rectify the received signal and provide dc power via a regulator to a Colpitts oscillator. The Colpitts oscillator senses pressure and provides an output signal that is proportional to the pressure. The system is fabricated using a mature, inexpensive 0.5μm CMOS fabrication process and is capable of operating over a range of 5.4cm.

Keywords

UHF antennas; biomedical equipment; diseases; eye; pressure sensors; radiofrequency identification; radiofrequency oscillators; rectifiers; CMOS fabrication; Colpitts oscillator; ESA; RFID-based pressure sensor; dc power; electrically small antenna; four-stage Schottky rectifier circuit; frequency 915 MHz; glaucoma; intraocular pressure sensing systems; radiofrequency identification-based pressure sensing system; received signal; Antenna measurements; CMOS integrated circuits; Dipole antennas; Oscillators; Radiofrequency identification; Rectifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (LASCAS), 2014 IEEE 5th Latin American Symposium on

Conference_Location

Santiago

Print_ISBN

978-1-4799-2506-3

Type

conf

DOI

10.1109/LASCAS.2014.6820300

Filename

6820300