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1-cm3 event-driven wireless sensor nodes

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5 Author(s)
Oshima, S. ; NTT Microsyst. Integration Labs., NTT Corp., Atsugi, Japan ; Matsunaga, K. ; Shimamura, T. ; Morimura, H.
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This paper describes a 1-cm3 event-driven wireless sensor node (WSN) consisting of a solar battery with a capacitor, vibration sensor, wireless circuit, and antenna. The WSN transmits data using energy in the millimeter-size capacitor charged by the solar battery. The concept of the wireless transmission scheme is to not only reduce 1-bit energy while transmitting data continuously but also to reduce all energy of “one-time data transmission” from circuit start-up to the end of data transmission. We have already fabricated and evaluated a wireless chip that uses ring oscillators as clocks and transmits OOK pulse trains. In this paper, we show that these architectures are suitable for reducing energy of “one-time data transmission” and for WSN operation by limited energy because they can reduce the start-up time and activated time in 1-bit symbol of RF circuits. The fabricated sensor node can transmit 36-bit data 3 m by charged energy of 8 μJ in the capacitor when the sensor detects the event. This enables us to achieve 1-cm3 WSN and paves the way to the future millimeter-size battery less WSNs.

Published in:

Communication Systems (ICCS), 2012 IEEE International Conference on

Date of Conference:

21-23 Nov. 2012