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An 8W GaN-Based H-Bridge Class-D PA for the 900 MHz Band Enabling Ternary Coding

A. Wentzel1, C. Meliani1, G. Fischer2, W. Heinrich1

Published in:

IEEE MTT-S Int. Microw. Symp. Dig., Montreal, Canada, Jun 17-22 (2012).

Abstract:

This paper presents an H-bridge class-D power amplifier (PA) for the 900 MHz band based on GaN MMICs. For a classical BPDS modulated signal, a maximum output power of 34.5 dBm with a drain efficiency of 22% is obtained. Using a periodic square-wave input signal, the PA achieves a peak output power of 39 dBm and maximum drain efficiency of 48%. Investigating different binary and a ternary coding schemes, up to 30% drain efficiency at 6 dB power back-off is achieved.

1 Ferdinand-Braun-Institut, Leibniz-Institut fuer Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, D-12489 Berlin, Germany
2 Lehrstuhl für Technische Elektronik, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

Index Terms:

H-bridge, class-D, microwave power amplifiers, pulse-width modulation, binary, ternary, GaN, MMIC.

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