A concurrent dual-band 1.9–2.6-GHz Doherty power amplifier with Intermodulation impedance tuning

Abstract

In this paper, a novel matching structure is introduced to implement accurate impedance matching at intermodulation (IM) frequencies in concurrent dual-band power amplifiers (PAs). Additionally, a concurrent dual-band Doherty power amplifiers (DPAs) architecture featuring Intermodulation impedance tuning (IM tuning) is introduced in this paper. Based on the proposed matching structure and DPA architecture, a concurrent dual-band 1.9-2.6 GHz DPA is designed and fabricated using two 13-Watts GaN HEMTs. After linearization, the proposed DPA exhibits drain efficiency higher than 50% and output power nearly 10 Watts in concurrent mode. Due to the accurate IM tuning, the efficiency and PUF are improved greatly compared with previously reported concurrent dual-band DPAs, by about 40 percent and 3 times, respectively. To our best knowledge, this is the first reported DPA with IM tuning and the state-of-the-art performance in terms of both efficiency and power utilization factor (PUF).