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Experimental Clock Calibration on a Crystal-Free Mote-on-a-Chip

Abstract : The elimination of the off-chip frequency reference,typically a crystal oscillator, would bring important benefits in terms of size, price and energy efficiency to IEEE802.15.4compliant radios and systems-on-chip. The stability of on-chip oscillators is orders of magnitude worse than that of a crystal.It is known that as the temperature changes, they can drift more than50ppm/◦C. This paper presents the result of an extensive experimental study. First, we propose mechanisms for crystal-free radios to be able to track an IEEE802.15.4 join proxy, calibrate the on-chip oscillators and maintain calibration against temperature changes. Then, we implement the resulting algorithms on a crystal-free platform and present the results of an experimental validation. We show that our approach is able to track a crystal-based IEEE802.15.4-compliant join proxy and maintain the requested radio frequency stability of±40ppm, even when subject to temperature variation of2◦C/min.
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https://hal.inria.fr/hal-02266563
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Submitted on : Wednesday, August 14, 2019 - 7:43:17 PM
Last modification on : Wednesday, September 23, 2020 - 10:53:13 AM
Long-term archiving on: : Thursday, January 9, 2020 - 7:38:24 PM

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Ioana Suciu, Filip Maksimovic, David Burnett, Osama Khan, Brad Wheeler, et al.. Experimental Clock Calibration on a Crystal-Free Mote-on-a-Chip. IEEE INFOCOM - CNERT 2019 : International Workshop on Computer and Networking Experimental Research using Testbeds, Apr 2019, Paris, France. ⟨hal-02266563⟩

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