Wirelessly Powered Sensor Transponder for UHF RFID

Author

Pursula, P. ; Marjonen, J. ; Ronkainen, H. ; Jaakkola, K.

Author_Institution

VTT Tech. Res. Centre of Finland, Espoo

fYear

2007

fDate

10-14 June 2007

Firstpage

73

Lastpage

76

Abstract

A transponder for UHF RFID with sensor interface for external capacitive sensors is described. The sensor interface consists of a capacitive voltage divider and a 10 bit successive approximation analog to digital converter. The power consumption is about 30 muW_DC and the transponder is wirelessly powered with RF waves from the reader device. Wireless measurement of capacitance is demonstrated at a distance of 30 cm with 0.5 W erp transmission power. Low operation distance is mostly due to low efficiency of the rectifying Schottky-diodes in the particular BiCMOS process.

Keywords

BiCMOS integrated circuits; Schottky diodes; UHF devices; analogue-digital conversion; capacitive sensors; radiofrequency identification; rectifying circuits; transponders; voltage dividers; BiCMOS process; UHF RFID; analog to digital converter; capacitive sensors; capacitive voltage divider; distance 30 cm; rectifying Schottky-diodes; sensor interface; wirelessly powered sensor transponder; Analog-digital conversion; Capacitance measurement; Capacitive sensors; Energy consumption; Radio frequency; Radiofrequency identification; Sensor phenomena and characterization; Transponders; Voltage; Wireless sensor networks; UHF RFID; sensor;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Sensors, Actuators and Microsystems Conference, 2007. TRANSDUCERS 2007. International

Conference_Location

Lyon

Print_ISBN

1-4244-0842-3

Electronic_ISBN

1-4244-0842-3

Type

conf

DOI

10.1109/SENSOR.2007.4300074

Filename

4300074