462-nW 2-axis gesture sensor interface based on capacitively controlled ring oscillators

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2 Citations (Scopus)

Abstract

This paper presents a 2-axis gesture sensor interface that consumes 462 nW powered by a 0.8 V supply. The system consists of two proximity sensor (PS) interfaces that provide digital data outputs. A single PS interface consists of a capacitively controlled ring oscillator (CCRO) whose frequency is sensitive to the capacitance between two copper plates in a coplanar deployment and additional capacitive load introduced by the presence of a hand. The CCRO in each interface is followed by a modified cascaded integrator comb (CIC) filter that performs the frequency-to-digital conversion, filtering and downsampling. When a total of three sensor plates are arranged in parallel, the middle one acting as a shared ground plate, the location of a user's hand can be obtained in two dimensions. Measurement results show that hand sweep gestures at 6-cm distance from the sensing plates can be detected by a lightweight algorithm.
Original languageEnglish
Title of host publication2017 IEEE International Symposium on Circuits and Systems (ISCAS) Proceedings
PublisherIEEE
Number of pages4
ISBN (Electronic)978-1-4673-6853-7
DOIs
Publication statusPublished - 28 Sep 2017
MoE publication typeA4 Article in a conference publication
EventIEEE International Symposium on Circuits and Systems - Marriot Waterfront, Baltimore, United States
Duration: 28 May 201731 May 2017
http://ieeexplore.ieee.org/document/8050249/

Publication series

NameIEEE International Symposium on Circuits and Systems proceedings
ISSN (Electronic)2379-447X

Conference

ConferenceIEEE International Symposium on Circuits and Systems
Abbreviated titleISCAS
CountryUnited States
CityBaltimore
Period28/05/201731/05/2017
Internet address

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    Pulkkinen, M., Salomaa, J., Moayer, M., Haapala, T., & Halonen, K. (2017). 462-nW 2-axis gesture sensor interface based on capacitively controlled ring oscillators. In 2017 IEEE International Symposium on Circuits and Systems (ISCAS) Proceedings (IEEE International Symposium on Circuits and Systems proceedings). IEEE. https://doi.org/10.1109/ISCAS.2017.8051005