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An ultra-low-power sensor interface for RFID-based sensor networks

: Gay, N.; Fu, Q.; Hildebrandt, R.; Bansleben, C.; Heiß, M.; Fischer, W.-J.

Eurosensors XXII. Proceedings. CD-ROM : Dresden, Germany, 7 - 10 September 2008
Dresden, 2008
ISBN: 978-3-00-025217-4
Eurosensors <22, 2008, Dresden>
Fraunhofer IPMS ()

An ultra-low-power four-channel sensor interface for RFID-based sensor networks employing an incremental ??-ADC is presented. The sensor is embedded in an EPC Gen2-compliant UHF/microwave RFIDtransponder. Power consumption can be regulated by means of the sampling frequency (max. 1MHz), sensor signal bandwidth (DC-16kHz), output resolution (max. 16 bits) and output word rate. Two channels can be cascaded (2-2 MASH configuration) further increasing the dynamic range and/or reducing the number of clock cycles to obtain a given resolution. The power consumption per channel ranges from 4 to 20?W at a supply voltage of 1.4V with a minimal dynamic range of 101dB.