A Dual-Band Voltage-Mode Class-D PA for 0.8/1.8 GHz Applications
IEEE MTT-S Int. Microw. Symp. Dig., Seattle, USA, Jun 2-7, TH3A-3 (2013).
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This paper presents a compact dual-band voltage-mode class-D power amplifier module suitable for the LTE frequency bands at 0.8 GHz and 1.8 GHz. It uses a broadband GaN voltage-mode PA MMIC and a hybrid lumped element dual-band filter structure. The amplifier can handle various pulse-mode or digital modulation schemes. For a pulsewidth modulated input signal the PA achieves a maximum output power of 5.4 W at 0.85 GHz and 4.3 W at 1.8 GHz. Peak drain efficiency is 84% and 54% for 0.85 GHz and 1.8 GHz, respectively. At 6 dB power back-off, drain efficiencies of 40% (0.85 GHz) and 25% (1.8 GHz) are obtained.
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany
Voltage-mode PA, dual-band filters, dualband power amplifiers, digital PA, class S.