A Dual-Band Voltage-Mode Class-D PA for 0.8/1.8 GHz Applications

Published in:
IEEE MTT-S Int. Microw. Symp. Dig., Seattle, USA, Jun 2-7, TH3A-3 (2013).
© Copyright 2013 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.

Abstract:
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.

Keywords:
Voltage-mode PA, dual-band filters, dualband power amplifiers, digital PA, class S.

Full version in pdf-format.