D. Al-Mozani, A. Wentzel, C. Meliani, and W. Heinrich

Published in:

7th German Microwave Conference (GeMiC 2012), Ilmenau, Germany, Mar. 12-14, paper 1470 (2012).

Abstract:

This paper presents a class-S power amplifier with voltage-mode class-D topology for the 900 MHz band. The design is based on a GaN-HEMT MMIC and realized as a hybrid module. For a typical 3.6 Gbps single-tone BPDSM input signal, the measured output power exceeds 1 W with an efficiency of 21%. In order to study the impact of coding efficiency, a periodic square-wave input signal was investigated as well. In this case, output power increases to 3 W. Efficiency rises to 43 % peaking at 59% for an output power of 0.8 W. For the voltage-mode version, these are the highest class-S output-power values in the 900 MHz band reported so far.

Index Terms:

power amplifier, class-S, voltage mode, GaN, HEMT, band-pass delta-sigma modulation, band-pass filter.

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