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Researchers develop 8bit SAR ADC for wireless sensor nodes

Posted: 16 Jan 2014 ?? ?Print Version ?Bookmark and Share

Keywords:SAR? ADC? wireless sensor nodes?

Researchers at the Public University of Navarra in Spain have developed an 8bit charge redistribution successive approximation register (SAR) analogue-to-digital converter (ADC) with a power consumption of 2-microwatts for use in wireless sensor nodes (WSNs). The ADC has potential application in a chip powered by energy from the environment.

A paper describing the chip, written jointly by Antonio Lopez-Martin, a Professor of the Department of Electrical and Electronics Engineering at the University of Navarra, and a telecommunications engineering student Inigo Cenoz-Villanueva, was selected the best paper at the 7th International Conference on Sensing Technology held in Wellington, New Zealand in December.

The ADC employs an innovation in the capacitor switching procedure that is used within charge-redistribution SARs. The paper simulation and measured results of a test chip operating at 100-ksamples per second show a spurious-free dynamic range of 55.63dB at a power consumption of 2.17-microwatts. The active area of the ADC is 0.275 square millimeters.

- Peter Clarke
??EE Times Europe

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