Représentation et traitement des signaux analogiques dans le domaine temporel, pour répondre aux défis des technologies CMOS très avancées

Abstract : Advanced CMOS nodes trend to reduce the size of transistors hence reducing the power supply voltages and consequently available dynamics for the representation of analog signals. This work aims at proposing a data representation alternative which is usually done by an amplitude value. The chosen solution is to use a time-domain representation.In this thesis, we study both the use of a VCO-based ADC to convert an analog data into a time-domain one and a calculating method using data already encoded into the time domain.The three pillars of this thesis are a method to digitize a time-domain data so as to do more complex calculations, a method with a « residue extraction » allowing us to improve VCO-based ADCs performance in terms of resolution for a given bandwidth and an innovative architecture of a hybrid ADC which can adjust its operation switching between an asynchronous low-performance mode (which is a low power mode) and a synchronous high-performance mode (which is more energy consuming). The potential of these methods is pointed out by means of simulations that mimic the behavior of the 28 nm FDSOI CMOS technology.
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David Buffeteau. Représentation et traitement des signaux analogiques dans le domaine temporel, pour répondre aux défis des technologies CMOS très avancées. Micro et nanotechnologies/Microélectronique. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAT105⟩. ⟨tel-02138956⟩

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