A global physical/electromagnetic HEMT simulation approach, entirely in the frequency domain, is here described for microwave CAD applications. The frequency-domain Spectral Balance technique for the solution of steady-state nonlinear differential equations is applied to the moments of Boltzmann's Transport Equation for the analysis of the intrinsic, active part of the device, yielding a very simple formulation. A numerical electromagnetic solver in the frequency domain is used for the analysis of the extrinsic, passive embedding and access structure. The two analyses are coupled, and give a self-consistent, global description of the device. The frequency-domain formulation allows easy inclusion of frequency-dependent parameters of the semiconductor, and a natural extension to multitone analysis, without the need for cumbersome time-frequency transformations. The thechnique is applied to a Quasi-2-Dimensional (Q-2D) hydrodynamic modeling of the active device for simplicity, but is suitable for more comprehensive approaches as well. DC and small-signal microwave results up to 40 GHz are obtained for a 0.3-µm gate-length AlGaAs–InGaAs–GaAs pHEMT transistor, and compared to experimental data.

Global Modeling Analysis of HEMTs by the Spectral Balance Technique

LEUZZI, GIORGIO;STORNELLI, Vincenzo
2007

Abstract

A global physical/electromagnetic HEMT simulation approach, entirely in the frequency domain, is here described for microwave CAD applications. The frequency-domain Spectral Balance technique for the solution of steady-state nonlinear differential equations is applied to the moments of Boltzmann's Transport Equation for the analysis of the intrinsic, active part of the device, yielding a very simple formulation. A numerical electromagnetic solver in the frequency domain is used for the analysis of the extrinsic, passive embedding and access structure. The two analyses are coupled, and give a self-consistent, global description of the device. The frequency-domain formulation allows easy inclusion of frequency-dependent parameters of the semiconductor, and a natural extension to multitone analysis, without the need for cumbersome time-frequency transformations. The thechnique is applied to a Quasi-2-Dimensional (Q-2D) hydrodynamic modeling of the active device for simplicity, but is suitable for more comprehensive approaches as well. DC and small-signal microwave results up to 40 GHz are obtained for a 0.3-µm gate-length AlGaAs–InGaAs–GaAs pHEMT transistor, and compared to experimental data.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11697/12817
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