Simple Small-Signal HEMT Model Suitable for GaN Stability Analysis and Technologies Benchmarking
Ammar Issaoun,
Thomas Roedle
Issue:
Volume 6, Issue 1, March 2021
Pages:
1-8
Received:
11 February 2021
Accepted:
20 February 2021
Published:
3 March 2021
Abstract: This article deals with the extension of the small-signal model usage to GaN technologies benchmarking, and to the detection of internal oscillations occurring in highly optimized multi-finger GaN high-electron-mobility transistors (HEMTs). The proposed small-signal model consists of only 14 circuit elements. Its simple semi-analytical extraction procedure is developed in Keysight ADS circuit simulator, letting instantaneous comparison between modelled and simulated small-signal parameters. The simplicity and the adaptability of the technique always ensures a physical model parameter extraction. The technique is demonstrated for various technology processes, layouts, dimensions, and for three commercially available GaN vendors. The extracted data and the number of circuit elements are used to benchmark GaN technologies in terms of bias dependency, efficiency, and static linearity. By coupling the small-signal model to the electromagnetic (EM) GaN HEMT layout simulation results in a powerful tool for detecting odd-mode and even-mode instabilities. The technique is proven for various GaN basic cells as well as for power bars. Even prior to structure fabrication, the tool can be used to analyze its stability behavior by exploring its layout.
Abstract: This article deals with the extension of the small-signal model usage to GaN technologies benchmarking, and to the detection of internal oscillations occurring in highly optimized multi-finger GaN high-electron-mobility transistors (HEMTs). The proposed small-signal model consists of only 14 circuit elements. Its simple semi-analytical extraction p...
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A Classical Electron Model with Synchrotron Radiation
Issue:
Volume 6, Issue 1, March 2021
Pages:
9-23
Received:
26 April 2020
Accepted:
13 January 2021
Published:
30 March 2021
Abstract: A classical model of the electron based on Maxwell’s equations is presented in which the wave character is described by classical physics. Most properties follow from the description of a classical massless charge circulating with v=c. The magnetic moment of the electron yields the radius of this circulation and the generated synchrotron radiation removes the singularity of the Coulomb field. The residual field equals then to the mass of the electron. Quantum mechanics yields its spin and the fine structure constant α compares this dynamic structure of the electron with the classical point-like static view. This configuration is not stable. It will decay by the emission of synchrotron radiation. The stability of this description is therefor investigated by extending this model to 3 dimensions. The field lines within the free electromagnetic fields of the creation process, solved in polar coordinates, yield possible tracks for a massless charge. Many possible circulating tracks are found but only a combination of background fields yield environments in which stable tracks for β = 1 - charges may be created. Knotted toroidal tracks yield the stability. A knotted field line e.g. with T(3,2)-symmetry may describe a spin-1/3-particle and a field line with T(2,3)-symmetry in form of a knotted trefoil may belong to an electron as a stable spin-1/2-particle. With its fixed internal revolution frequency this electron appears to the external world as a standing wave with an amplitude propagating like the de Broglie wave.
Abstract: A classical model of the electron based on Maxwell’s equations is presented in which the wave character is described by classical physics. Most properties follow from the description of a classical massless charge circulating with v=c. The magnetic moment of the electron yields the radius of this circulation and the generated synchrotron radiation ...
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