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A long range passive UHF transponder ASIC with temperature sensor

: Feldengut, Tobias; Kolnsberg, Stephan; Kokozinski, Rainer

TU Ilmenau:
54. Internationales Wissenschaftliches Kolloquium 2009. CD-ROM : 7th - 10th September 2009, Conference Proceedings
Ilmenau: Technische Universität Ilmenau, 2009
ISBN: 978-3-938843-45-1
5 pp.
Internationales Wissenschaftliches Kolloquium (IWK) <54, 2009, Ilmenau>
Conference Paper
Fraunhofer IMS ()
passive; temperature sensor; Transponder

Recent development in UHF RFID Tags has been focused on the optimization of the powering and communication range of the reader/tag system [1]. The use of low threshold Shottkydiode rectifiers and the rigorous minimization of the tag power consumption have yielded read ranges of more than 10 m for simple identification tags. Sensor transponders that serve as nodes in wireless networks require a more complex chip architecture with a stable, regulated supply voltage and precise currentand voltage references. The analog/digital conversion of sensor data leads to short periods of large current consumption on the tag side. A passive UHF sensor tag was designed in a 0.35 µm CMOS process with Schottky diodes and double poly layers. The tag operates in the 868 MHz ISM band and the air interface is compatible to the ISO 18000-6 standard. The tag with temperature sensor consumes up to 10 µA from the DC supply, which leads to an operation range of more than 4 m. The data rate, the size and the maximum range of each sensor node are significantly improved in comparison with existing LF and HF solutions.