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Theses

Analysis by “reverse engineering” methods of ultra-table piezoelectric resonators and noise modelling.

Abstract : Bulk Acoustic Wave Resonators (BAW) have been studied in Time and Frequency domain for a long time, particularly at FEMTO-ST. They have an essential role in many metrological applications such as in positioning devices like GPS, Glonass, Galileo, etc. This thesis work presents the passive technic used for phase noise measurement in high-performance BAW resonators. These resonators were fabricated by several European manufacturers and provided for the thesis work by CNES for reverse engineering investigations.The work begins with recalling the basics of piezoelectricity in quartz and noise in ultra-stable resonators.The second part of the work gives details on noise measurement by carrier suppression technic with an alternative technic for low impedance resonators (< 10 ohms).The third part is about the comparison of Steven-Tiersten’s model with our phase noise measurement results at different temperatures and classification of resonators according to their short-term stability. A finite element simulation is used to compare the theory and experimental results.The fourth part presents tests using Mittag-Leffler distribution and stable distributions of a model of phase noise due to power law intermittency.Finally, the “reverse engineering” work is carried out by dismantling some resonators for defects analysis using X-rays diffraction and laser scattering. This revealed macroscopic imperfections and a few dislocations which could be a possible cause for phase noise in the resonators. This will have to be confirmed and quantified with other resonators.
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https://tel.archives-ouvertes.fr/tel-03022147
Contributor : Abes Star :  Contact
Submitted on : Tuesday, November 24, 2020 - 4:31:09 PM
Last modification on : Thursday, January 13, 2022 - 12:00:27 PM
Long-term archiving on: : Thursday, February 25, 2021 - 8:42:43 PM

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  • HAL Id : tel-03022147, version 1

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Alok Pokharel. Analysis by “reverse engineering” methods of ultra-table piezoelectric resonators and noise modelling.. Vibrations [physics.class-ph]. Université Bourgogne Franche-Comté, 2020. English. ⟨NNT : 2020UBFCD025⟩. ⟨tel-03022147⟩

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