1,721,174 research outputs found
Equivalent circuit of FET active loads for non-linear applications
Full text linkFET-based active loads have been fabricated and tested, and their equivalent circuit extracted for linear and non-linear applications. The extraction procedure requires the availability of an equivalent three-terminal FET device for accurate model identification. The model proves to be easy to extract, accurate and general
Efficient Frequency Domain plus Spatial Expansion Method For Semiconductor Devices Modeling
No full textLagrangian micromixing models for concentration fluctuations. An overview
Full text linkThis study presents a brief overview of the main features, theoretical formulations and validation tests of some Lagrangian micromixing models, currently used for estimations of the ensemble mean and the turbulent fluctuations of concentration. Their application fields regards several pollutant dispersion phenomena such as: accidents (power or production plants, terroristic attacks, hydrocarbons storage and transport, extraordinary emissions), odours (power plants and energy production from waste resourcescompost, dumps, incinerators, biogas storage and smokes-, high enthalpy geothermic plants-sulfide hydrogen-, animal farms), micro-scale dispersion from continuous or spot emissions (traffic pollutants, power and production plants, dispersion in aquatic environments...), industrial processes (combustion, pollutant treatment,...), strong non-linear relationship between concentration and damage (inflammable substances, explosions,..), reactions depending on instantaneous concentrations. © 2012 Science Publication
A Frequency-Domain Spectral-Balance Quasi-Two-Dimensional Approach for the Simulation of Nonlinear Devices and Circuits
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Frequency-Domain Physics-Based Analysis of semiconductor devices by a Spectral-Balance approach
No full textStability Characterizing Function for Electronic Circuit Design Based on Frequency-Domain Analysis With Parametric Damping
Full text linkA stability characterizing function (SCF) to be used for small and large-signal stability analysis and design of single and multitransistor electronic circuits is proposed. Stability constraints based on this function can be integrated with the framework of standard computer-aided design (CAD) procedures. The method is based on the bounded-input–bounded-output (BIBO) stability criterion, where a suitable set of input and output variables is chosen at the ports of all the nonlinear intrinsic electron device (IED) models. These variables are linked by a nonlinear state perturbation (NSP) matrix, whose elements are directly computed by analyzing an associated parametrically damped (PD) (i.e., stabilized) circuit. The proposed SCF is defined in terms of the NSP matrix elements and is a scalar function of frequency and the damping parameter. Circuit stability margins are easily evaluated by visual inspection of the plot of this function. Preliminary experiment validation is carried out by applying this approach for checking the self-starting capabilities of an oscillator as well as for the small and large-signal stability analysis of a two-transistor balanced amplifier and a single-transistor PA
Conversion Matrix extraction by commercial CAD software for the stability design of autonomous circuits
No full textIn this paper a method to extract the conversion matrix of a nonlinear circuit by
commercial CAD simulators is proposed. As an example, the conversion matrix, computed
from a harmonic balance simulation, is used to control the stability of oscillators under large signal conditions. This allows the suppression of possible spurious frequencies or the intentional generation of spurious signals (e.g. at sub-harmonic frequency)
Charatterisation of active loads for MMIC’s
No full textActive loads have been fabricated and tested, and their characterisation addressed for use in microwave CAD programs. The first results show that non-ideal (parasitic) effects are present that can easily be evaluated. Comparison with a three-terminal FET structure shows that a characterisation in terms of an equivalent circuit is feasible, and suggests a possible procedure for the extraction
Modelli Lagrangiani per la valutazione della dispersione di inquinanti
No full textINGEGNERIA SANITARI
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