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

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Research units


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
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

Publication series

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


ConferenceIEEE International Symposium on Circuits and Systems
Abbreviated titleISCAS
CountryUnited States
Internet address

ID: 15743642