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An analog front end for a passive UHF transponder with temperature sensors

: Feldengut, T.; Wang, J.; Kolnsberg, S.; Kokozinski, R.

European Microwave Association:
European Microwave Week 2008. CD-ROM : EuMW 2008; the European Microwave Week now consists of four conferences: European Microwave Conference (EuMC); European Wireless Technology Conference (EuWiT); European Radar Conference (EuRAD); European Microwave Integrated Circuits Conference (EuMIC); 27-31 October 2008, Amsterdam Rai, Amsterdam, The Netherlands
Piscataway, NJ: IEEE, 2008
European Microwave Week (EuMW) <11, 2008, Amsterdam>
European Microwave Conference (EuMC) <38, 2008, Amsterdam>
European Wireless Technology Conference (EuWiT) <2008, Amsterdam>
European Radar Conference (EuRAD) <2008, Amsterdam>
European Microwave Integrated Circuits Conference (EuMIC) <3, 2008, Amsterdam>
Conference Paper
Fraunhofer IMS ()
temperature sensor; sensor tag; passive UHF transponder; RFID; transponder; Temperatursensor; passiver Transponder

We present the analog front-end for a passively powered UHF transponder with integrated temperature sensor that was designed for a 0.35 µm CMOS process with EEPROM, Schottky diodes, and double poly layers. Due to a more complex architecture and additional functionality, the power consumption of the presented sensor transponder tag is significantly larger than that of simple RFID tags. The maximum operating distance is approximately 3 m, which is less than reported values of well over 10 m for state of the art identification tags. The A/D conversion requires a stable, ripple-free supply voltage with a relatively large DC value. The aim of the front-end design in this work is to guarantee the generation and regulation of this voltage, even at a relatively high, time-varying current consumption. The design of the three main circuit blocks (the power generator, the modem, and the clock generator) is focussed on a reliable operation for different temperatures, process variations, and operating istances. All circuits have been optimized to meet these requirements while maintaining relatively low power consumption.