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Développement et implantation d’un modèle de diode par VHDL-AMS : Discrétisation selon la méthode Scharfetter-Gummel

Abstract : Computer-aided design (CAD) is widely used in the semiconductor industry for the design and analysis of individual components whose study is to solve the drift-diffusion equation and the Poisson equation. The nonlinear characteristic of these equations request interactive digital solutions. The diagram Scharfetter-Gummel is conventionally used to discretize the non-degenerate drift-diffusion equation (or equation Schockley) to simulate particle transport phenomena "electrons and holes" in a semiconductor. Initially this method was applied to a one-dimensional domain. Subsequently, this method was extended to the two-dimensional problem on the basis of a rectangular mesh. So the aim of this thesis is to implement a VHDL-AMS diode model based on the discretization using the Scharfetter-Gummel method. The VHDL-AMS (Hardware Description Language - Analog Mixed Signal) is a behavioral description language for analog and mixed circuits. Inspired by its equivalent for logic circuits, VHDL, VHDL-AMS would be an extension. Since the VHDL-AMS is high level, this will allow us to model the behavior of physical systems, electrical, mechanical or otherwise. Meanwhile VHDL-AMS can create modules, called "entities". These are defined by their external ports (which are an interface with other architectures or entities) and by mathematical equations. The ability to use mathematical relationships directly in the description of the model gives us great flexibility. Like all analog behavioral description languages, VHDL-AMS is initially dedicated to the modeling of the type "high level" as the modeling of complete electronic systems. The use of such a language in order to achieve a diode model thus constitutes an alternative to the latter. Due to the large number of node it is necessary to generate the VHDL-AMS code from a Matlab-based interface. The results obtained by this method will be compared with others from various softwares. The model design will aim: - Match the specifications originally drawn by designers and in order to allow them to highlight the different characteristics of the modules. - Easily Simulate integration and / or the component adequacy in a given system - Be designed so that it is used in more complex components. -Finally We plan to conduct experimental measures in order to verify the accuracy of our model.
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Joseph Kesserwani. Développement et implantation d’un modèle de diode par VHDL-AMS : Discrétisation selon la méthode Scharfetter-Gummel. Electronique. INSA de Lyon; Université libanaise, 2015. Français. ⟨NNT : 2015ISAL0073⟩. ⟨tel-01278526⟩

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