A streamlined drain-lag model for GaN HEMTs based on pulsed S-parameter measurements

P. Luo1,2, F. Schnieder2, O. Bengtsson2, V. Vadala3, A. Raffo3, W. Heinrich2 and M. Rudolph1,2

Published in:

Int. J. Microwave Wireless Technolog., vol. 11, no. 2, pp. 121-129 (2019).

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Abstract:

Accurately and efficiently modeling the drain-lag effects is crucial in nonlinear large-signal modeling for Gallium Nitride high electron mobility transistors. In this paper, a simplified yet accurate drain-lag model based on an industry standard large-signal model, i.e., the Chalmers (Angelov) model, extracted by means of pulsed S-parameter measurements, is presented. Instead of a complex nonlinear drain-lag description, only four constant parameters of the proposed drain-lag model need to be determined to accurately describe the large impacts of the drain-lag effects, e.g., drain-source current slump, typical kink observed in pulsed IV curves, and degradation of the output power. The extraction procedure of the parameters is based on pulsed S-parameter measurements, which allow to freeze traps and isolate the trapping effects from self-heating. It is also shown that the model can very accurately predict the load pull performance over a wide range of drain bias voltages. Finally, the large-signal network analyzer measurements at low frequency are used to further verify the proposed drain-lag model in the prediction of the output current in time domain under large-signal condition.

1 Brandenburgische Technische Universität Cottbus-Senftenberg, 03046 Cottbus, Germany
2 Ferdinand-Braun-Institut, Leibniz-Institut f&ür Höchstfrequenztechnik, 12489 Berlin, Germany
3 Department of Engineering, University of Ferrara, 44122 Ferrara, Italy

Keywords:

Chalmers model; drain-lag effects; GaN HEMT modeling; pulsed S-parameter measurements; trapping effects