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Title: A 0.5 V-1.4 V supply-independent frequency-based analog-to-digital converter with fast start-up time for wireless sensor networks
Authors: Volkaerts, Wouter
Marien, Bart
Danneels, Hans
De Smedt, Valentijn
Reynaert, Patrick
Dehaene, Wim
Gielen, Georges #
Issue Date: 3-Aug-2010
Series Title: 2010 International Symposium on Circuits and Systems pages:3096-3099
Conference: IEEE International Symposium on Circuits and Systems (ISCAS) location:Paris, France date:May 30 -June 2 2010
Abstract: RF-powered wireless sensor networks demand for ultra-low-energy A/D converters. Such systems have specific requirements, like fast start-up time and supply voltage independence. The presented A/D converter is based on a digital phase locked loop. Two closely matched ring oscillators perform the analog to frequency conversion. The digital output is generated by an in-loop digital proportional-integral filter. The acquisition of the PLL is splitted into coarse and fine tuning to reduce the locking time to less than 30µs. A UMC130 CMOS technology is used to simulate a temperature sensor interface. The energy consumption is maximally 212 pJ per conversion and the effective number of bits is 7 bit in a 0.5 V-1.4 V supply voltage range.
Publication status: published
KU Leuven publication type: IC
Appears in Collections:ESAT - MICAS, Microelectronics and Sensors
# (joint) last author

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