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This paper presents an extensive numerical analysis of the thermal behavior of InGaP/GaAs HBTs in a laminate (package) environment. The combination between the Design of Experiments technique and a fast and accurate simulation capability is adopted to quantify the impact of all the key technology parameters and explore a wide range of operating conditions.
This paper presents an extensive analysis aimed at quantifying the impact of all the key layout and technology parameters on the thermal behavior of InGaP/GaAs HBTs. The investigation is conducted by resorting to accurate 3-D numerical simulations performed in accordance to the Design Of Experiments technique.
DOTSEVEN is an ambitious research project aiming at pushing the limits of SiGe HBT technology, modeling, circuits, and systems towards mm- and sub-mm wave applications. The project with a 12.3 M€ total funding and a duration of 45 months started in late 2012 and has been sponsored by the European Commission. This paper gives an overview on the project goals, its organization, and selected results...
Thermal Feedback Blocks are a viable approach to perform thermal and electrothermal simulations of electronics systems with very fast-switching inputs, for which the coupling of a finite-element method thermal solver with a physics-based or a circuit simulator cannot be used. In this work, we describe a RC-based thermal network improving the conventional Foster and Cauer solutions, which is used to...
A novel Model Order Reduction approach for the construction of Dynamic Compact Thermal Models is presented. With respect to previous approaches, this methodology allows reducing the complexity of the constructed models, from quadratically to linearly dependent on the number of independent heat sources. In such a way, the approach allows constructing Dynamic Compact Thermal Models practically without...
The lifetime estimation of power converters is a crucial issue for the reliability of electrical generators with renewable sources. During normal operations, the switching devices show junction temperature cycles that are widely recognized as the main cause of their failures. Although in-line junction temperature monitoring is extremely difficult, its knowledge is essential in order to achieve a reliable...
The reliability of high-speed SiGe:C HBT under electrical stress close to the Safe Operating Area (SOA) limit is analyzed and modeled. A long time stress test, up to 1000h, is performed at bias conditions chosen according to applications targeted for these transistors. During the aging tests, Gummel plots are measured at fixed time to analyze the evolution of base and collector current. At low level...
This paper presents a fast and accurate approach for the dynamic electrothermal analysis of photovoltaic (PV) plants with a cell-level discretization. A circuit model is developed for the elementary cell, and an equivalent electrical network is automatically built in a preprocessing stage to account for the power-temperature feedback. The PV plant under analysis is represented as an electrical macrocircuit...
Failure mechanisms during short-circuit conditions of Silicon Carbide Power MOSFETs are analysed in this work, and a possible theoretical explanation is provided. Insight into the physics involved in such processes was inferred through experimental and numerical analyses. The TCAD structure used for electro-thermal simulations was calibrated to fit the ID-VGS characteristics of a commercial device...
This work is focused on the analysis of the dynamic thermal behavior of advanced GaAs HBTs, with particular emphasis on BiFET technologies, where pHEMTs are integrated below the conventional bipolar device. A novel highly-efficient tool is employed to determine the influence on the thermal impedance of the key layout and technology features, namely, size of the emitter and base-collector mesa, pHEMT...
This paper presents a computationally efficient 3-D simulation approach for the dynamic electrothermal analysis of SiC power MOSFETs. The strategy relies on a circuit representation of the whole device, where the electrothermal feedback is enabled through an equivalent electrical network, and the elementary device cell is described by a novel behavioral model accounting for the non-intuitive temperature...
Small shadows are often neglected in the prediction of energy producible by photovoltaic systems. This is mostly due to the lack of specific tools available in commercial design software packages, which neither allow realistic drawings nor can account for individual solar cells currents. In this paper the effects of small shadows are accurately analyzed with reference to two special cases, a TV antenna...
This paper propose a new system to short circuit a photovoltaic panel, embedded in a photovoltaic string, with the aim to ensure safe operation of firemen in case of fire. The circuit is activated by a wireless command and doesn't require additional wiring. Moreover it is self powered by the solar panel itself and can be either turned on or turned off in a fully reversible way.
In this paper a new monitoring system, suitable for large photovoltaic fields, is presented. Differently from others available monitoring systems the new approach is based on a sensor network which collects detailed information about the electrical performances of each string forming a photovoltaic plant. A devised electronic board has been specifically developed and prototyped which embeds innovative...
In this paper a novel time-domain identification procedure for passive RC multiport networks is introduced, based on convex optimization and allowing the straightforward enforcement of basic physical constraints, specifically tailored to thermal impedances. The identification is performed in two steps. First, the time constants are identified for each element of the thermal impedance matrix by means...
We present a parameterized macromodeling approach to perform fast and effective dynamic thermal simulations of electronic components and systems where key design parameters vary. A decomposition of the frequency-domain data samples of the thermal impedance matrix is proposed to improve the accuracy of the model and reduce the number of the computationally costly thermal simulations needed to build...
In this paper, a novel circuit model of photovoltaic (PV) cells is presented, which exploits the thermal equivalent of the Ohm's law and the macromodeling technique to describe the temperature dependence of all key parameters and allow a specific temperature for each cell. The model is compatible with commercial SPICE-like simulation tools, and suitable to be employed for dynamic electrothermal (ET)...
In this paper, an innovative topology performing a Power Line Communication on DC bus, with series connected photovoltaic modules, is presented. The circuit ensures the transmission on the DC bus even if the transceivers cannot share the same reference voltage. Moreover, a circuit solution avoiding that the operating point of the photovoltaic string can be affected is proposed. The circuit is provided...
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