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Oscillateurs Asynchrones en Anneau : de la Théorie à la Pratique Thèse soutenue

Abstract : Oscillators are essential building blocks in many applications. For instance, they are basic blocks in almost all designs: they are part of PLLs, clock recovery systems and frequency synthesizers. The design of a low phase-noise multi-phase clock circuitry is especially crucial when a large number of phases is required. There are plenty of works covering the design of multiphase clocks. High frequency oscillators can be implemented using ring structures, relaxation circuits or LC circuits. Ring architectures can easily provide multiple clocks with a small die size. With the advanced nanometric technologies, it is also required to deal with the process variability, stability and phase noise. Today many studies are oriented to Self-Timed Ring (STR) oscillators which present well-suited characteristics for managing process variability and offering an appropriate structure to limit the phase noise. Therefore, self-timed rings are considered as promising solution for generating clocks. This thesis studies the benefits and potential offered by Self-Timed Ring oscillators. Two main applications have been identified. On the one hand, these oscillators are a promising solution for the generation of high-frequency multi-phase low phase noise clocks. On the other hand, they are a simple alternative to some extent to the conventional oscillators and DLLs, because they are digitally programmable. Several oscillators have been designed, implemented, manufactured in 65 nm CMOS technology from STMicroelectronics, and characterized. This work has demonstrated the relevance of these oscillators, which are a serious alternative to the conventional ring oscillators based on inverters.
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https://tel.archives-ouvertes.fr/tel-00669620
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Submitted on : Wednesday, June 6, 2012 - 12:00:55 PM
Last modification on : Friday, March 25, 2022 - 11:09:35 AM
Long-term archiving on: : Friday, September 7, 2012 - 2:21:38 AM

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  • HAL Id : tel-00669620, version 1

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Oussama El Issati. Oscillateurs Asynchrones en Anneau : de la Théorie à la Pratique Thèse soutenue. Micro et nanotechnologies/Microélectronique. Institut National Polytechnique de Grenoble - INPG, 2011. Français. ⟨NNT : ⟩. ⟨tel-00669620⟩

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