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Sensors 2015, 15(9), 21554-21566; doi:10.3390/s150921554

0.5 V and 0.43 pJ/bit Capacitive Sensor Interface for Passive Wireless Sensor Systems

CEIT and Tecnun (University of Navarra), Manuel de Lardizabal 15, Donostia 20018, Spain
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Author to whom correspondence should be addressed.
Academic Editor: Mohamed F. Younis
Received: 22 June 2015 / Revised: 7 August 2015 / Accepted: 26 August 2015 / Published: 28 August 2015
(This article belongs to the Section Sensor Networks)
View Full-Text   |   Download PDF [11797 KB, uploaded 28 August 2015]   |  

Abstract

This paper presents an ultra low-power and low-voltage pulse-width modulation based ratiometric capacitive sensor interface. The interface was designed and fabricated in a standard 90 nm CMOS 1P9M technology. The measurements show an effective resolution of 10 bits using 0.5 V of supply voltage. The active occupied area is only 0.0045 mm2 and the Figure of Merit (FOM), which takes into account the energy required per conversion bit, is 0.43 pJ/bit. Furthermore, the results show low sensitivity to PVT variations due to the proposed ratiometric architecture. In addition, the sensor interface was connected to a commercial pressure transducer and the measurements of the resulting complete pressure sensor show a FOM of 0.226 pJ/bit with an effective linear resolution of 7.64 bits. The results validate the use of the proposed interface as part of a pressure sensor, and its low-power and low-voltage characteristics make it suitable for wireless sensor networks and low power consumer electronics. View Full-Text
Keywords: capacitive-sensor interface; low-power sensor interface; period modulation; pressure sensor capacitive-sensor interface; low-power sensor interface; period modulation; pressure sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Beriain, A.; Gutierrez, I.; Solar, H.; Berenguer, R. 0.5 V and 0.43 pJ/bit Capacitive Sensor Interface for Passive Wireless Sensor Systems. Sensors 2015, 15, 21554-21566.

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