A comprehensive class A to B power and load-pull characterization of GaN HEMT son SiC and sapphire substrates

Camarchia, V. ; Donati Guerrieri, S. ; Pirola, M. ; Teppati, V. ; Ghione, G. ; Peroni, M. ; Lanzieri, C. (2005) A comprehensive class A to B power and load-pull characterization of GaN HEMT son SiC and sapphire substrates. In: Gallium Arsenide applications symposium. GAAS 2005, 3-7 ottobre 2005, Parigi.
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Abstract

An extensive power characterization of devices fabricated on GaN grown on SiC and sapphire substrates has been carried out, including powers weep and load-pull measurements in different bias conditions from class A to class B. An active load-pull bench optimized for high voltage and high power measurements allows to extend the load-pull characterization to the whole Smith chart, and to localize the optimum load conditions even for devices with almost reactive optimum terminations. The characterization procedure allows to verify scaling rules and the effects of defects and thermal degradation on the device power performances. The results of the SiC and sapphire-based devices show that, on one side, SiC-based devices exibit state-of-the-art performances in Class A, and, on the other side, low-cost sapphire-based devices, when biased in high efficiency classes, can be viable candidates for medium power applications, despite the higher thermal resistivity of sapphire compared with the one of SiC.

Abstract
Document type
Conference or Workshop Item (Paper)
Creators
CreatorsAffiliationORCID
Camarchia, V.
Donati Guerrieri, S.
Pirola, M.
Teppati, V.
Ghione, G.
Peroni, M.
Lanzieri, C.
Subjects
DOI
Deposit date
15 Feb 2006
Last modified
17 Feb 2016 14:25
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