Sami Ghedira

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Design of integrated power systems requires prototype-less approaches. Accurate simulations are necessary for analysis and verification purposes. Simulation relies on component models and associated parameters. The paper focuses on a step-by-step extraction procedure for the design parameters of a one-dimensional finite-element-method (FEM) model of the PiN(More)
The literature proposes some thermal models needed for the electrothermal simulation of power electronic systems. This paper gives a useful analysis about the choice of the thermal model circuit networks, equivalent to a discretization of the heat equation by the finite difference method (FDM) and the finiteelement method (FEM), and an analytic model(More)
Commercial power diodes are optimized to feature punch-through behavior. However, a tradeoff between the width and the doping level of the diode epitaxial layer leads to various levels of optimization. For a given breakdown voltage, a shorter epitaxial layer width leads to better transient performances. Device datasheets do not cover this issue and a simple(More)
The main objective of this paper is to develop a model of an inductor dedicated to the monolithic integration of DC/DC converters for mobile phone applications. Numerical simulation based on the finite element method shows that in contrast to 2D models, modeling of 3D integrated inductors can better estimate the electrical parameters of the desired(More)
In this work we have developed and implemented on VHDL-AMS a model of the PiN diode, based upon the bond graph energy-flow modelling and the regional hypothesis. The PiN diode model is an association of several semiconductors region models. Each region is described by its important physical mechanism and the energy flow transfer between these regions is(More)
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A new experimental set-up is developed and validated to characterize high voltage diodes in switch transient regime. Parameters extracted from DMTVCA and OCVD techniques is validated in a buck converter on a resistive load. The experimental set-up enable to measure nice current and voltage transient characteristics, i.e. without noise and high parasitic(More)
The memristor, known as “the fourth fundamental passive circuit element”, was predicted theoretically in 1971 by Prof. Leon Chua. It has attracted the scientist's attention since the physical implementation demonstrated in 2008 by HP Labs research team. However, at the nanoscale, due to its diversified modeling methods, SPICE memristor models(More)
This paper presents an analysis of the choice of integrated inductor for energy conversion in order to improve the DC-DC converter efficiency and their monolithic integration. A comparative study using two forms of turns, allowed to choose the best form of inductor which provides good values of inductance and quality factor for the same area occupied. In(More)
The aim of this paper is to combine the Bond Graph energy-flow modeling and the VHDL-AMS signal-flow modeling language for the simulation and the prototyping of modern switch-mode power converters. The proposed approach was used to model a specific test case, consisting of a Buck converter with a mixed-signal PWM regulator. The causal structure of bond(More)
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