Behavioural modelling of amplifier asymmetry in the time domain

Jang, Wonhoon; Kriplani, Nikhil M.; Steer, M.B.

doi:10.1002/jnm.1842

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…Therefore, empirical models have been widely used in practical circuits design. However, by taking the drain current modeling as an example, the conventional empirical models are not able to distinguish the different working state of the device and use only one set of parameters or formulas to fit all the states . As a result, the predicted data cannot fit the measurement very well, especially for the high power device.…”

Section: Introductionmentioning

confidence: 99%

A novel approach for the modeling of HEMT high power device

Sang

Huang

et al. 2016

Int J Numerical Modelling

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Current characteristic has not been detailed, analyzed, and modeled in conventional High-electron-mobility transistor field-effect transistor model, which is not accuracy enough because the current has different variation rules under different gate voltages. A novel approach for the modeling of high-electron-mobility transistor high power amplifier is proposed in this paper. In order to obtain a more accuracy nonlinear model, drain current database are divided into three different regions, including the high gate bias region, the middle gate bias region, and the approximate pinch-off regions. The three nonlinear current regions are modeled separately and implemented in final high-electron-mobility transistor field-effect transistor model based on support vector regression algorithm. The proposed model is validated with high accuracy by comparing the simulated data with the tested data of a high power gallium nitride high-electron-mobility transistor amplifier, which the modeling is based on fewer samples compared with conventional methods based on the integrated current model. Figure 4. The support vector regression (SVR)-based nonlinear modeling flow chart (a) and I ds predicted process of the discrete method (b) (T 1 and T 2 are the decision threshold).6 of 11 L. SANG ET AL.

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Section: Introductionmentioning

confidence: 99%

A novel approach for the modeling of HEMT high power device

Sang

Huang

et al. 2016

Int J Numerical Modelling

View full text Add to dashboard Cite

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Multiscale modeling and nested simulations of three-dimensional ionospheric plasmas: Rayleigh–Taylor turbulence and nonequilibrium layer dynamics at fine scales

Mahalov

2014

Phys. Scr.

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Multiscale modeling and high resolution three-dimensional simulations of nonequilibrium ionospheric dynamics are major frontiers in the field of space sciences. The latest developments in fast computational algorithms and novel numerical methods have advanced reliable forecasting of ionospheric environments at fine scales. These new capabilities include improved physics-based predictive modeling, nesting and implicit relaxation techniques that are designed to integrate models of disparate scales. A range of scales, from mesoscale to ionospheric microscale, are included in a 3D modeling framework. Analyses and simulations of primary and secondary Rayleigh-Taylor instabilities in the equatorial spread F (ESF), the response of the plasma density to the neutral turbulent dynamics, and wave breaking in the lower region of the ionosphere and nonequilibrium layer dynamics at fine scales are presented for coupled systems (ions, electrons and neutral winds), thus enabling studies of mesoscale/microscale dynamics for a range of altitudes that encompass the ionospheric E and F layers. We examine the organizing mixing patterns for plasma flows, which occur due to polarized gravity wave excitations in the neutral field, using Lagrangian coherent structures (LCS). LCS objectively depict the flow topology and the extracted scintillation-producing irregularities that indicate a generation of ionospheric density gradients, due to the accumulation of plasma. The scintillation effects in propagation, through strongly inhomogeneous ionospheric media, are induced by trapping electromagnetic (EM) waves in parabolic cavities, which are created by the refractive index gradients along the propagation paths.

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Behavioural modelling of amplifier asymmetry in the time domain

Cited by 2 publications

References 27 publications

A novel approach for the modeling of HEMT high power device

A novel approach for the modeling of HEMT high power device

Multiscale modeling and nested simulations of three-dimensional ionospheric plasmas: Rayleigh–Taylor turbulence and nonequilibrium layer dynamics at fine scales

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