Title :
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
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;
Conference_Titel :
Circuits and Systems (LASCAS), 2014 IEEE 5th Latin American Symposium on
Conference_Location :
Santiago
Print_ISBN :
978-1-4799-2506-3
DOI :
10.1109/LASCAS.2014.6820300
