RF Class-S Power Amplifiers: State-of-the-Art Results and Potential
A. Wentzel, C. Meliani, W. Heinrich
Published in:
IEEE MTT-S Int. Microw. Symp. Dig., Anaheim, CA, May 25-27, pp. 812-815 (2010).
Abstract:
This paper reports recent results on a current-mode class-S power amplifier for the 450 MHz band, based on GaNHEMT MMICs. We achieve a peak output power of 8.7 W for a single tone at 420 MHz, encoded in standard band-pass deltasigma modulation with 1.68 Gbps sampling frequency. The respective efficiency is 34%. We find that these values strongly vary with coding efficiency of the modulation and reach 19 W with 59% for square-wave excitation. In order to clarify the potential of the PA in more detail, the S-class characteristics at power back-off and with varying oversampling ratio are presented as well.
Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany
Keywords:
power amplifier, class-S, GaN, HEMT, switchmode, band-pass delta-sigma modulation.
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