Iterative Design of a Harmonically Tuned Multi-Octave Broadband Power Amplifier
M. Sakalas1, S. Preis1, D. Gruner1, G. Boeck1,2,
Published in:
IEEE MTT-S Int. Microw. Symp. Dig., Tampa Bay, USA, Jun 1-6, TH2B-2 (2014).
Abstract:
This article presents the design approach, realization and measurement results of a highly efficient double octave wideband power amplifier using a GaN-HEMT bare-die. An iterative approach to obtain the optimum source and load impedances is described. Multiple harmonics are analyzed using harmonic load-pull simulation and a reliable large-signal device model. The design was realized exploiting a transition between two substrates and a vertical impedance step transformation. From 1.5 GHz to 6 GHz, a constant high output power and remarkable efficiency were achieved. More than 20 W saturated power and 50 % drain efficiency were measured up to 5.5 GHz.
1 Microwave Engineering Lab, Berlin Institute of Technology, Einsteinufer 25, 10587 Berlin, Germany
2 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany
Index Terms:
Broadband amplifiers, gallium nitride, HEMTs, high efficiency, impedance matching, power amplifiers.
© Copyright 2014 IEEE - All Rights Reserved. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Full version in pdf-format.