Title :
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
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 muWDC 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;
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
DOI :
10.1109/SENSOR.2007.4300074
