Doherty Power Amplifier With Extended Bandwidth and Improved Linearizability Under Carrier-Aggregated

Doherty Power Amplifier With Extended Bandwidth and Improved Linearizability Under Carrier-Aggregated

Abstract

This letter proposes a novel output combining network devised to extend a Doherty power amplifier’s (DPA’s) radio frequency bandwidth (RFBW), while maintaining the proper load modulation, and to ensure its linearizability when driven with intra- and inter-band carrier aggregated (CA) communication signals. Based on the proposed topology, a wideband 20-W DPA was designed and implemented using packaged GaN transistors. Drain efficiency in excess of 48% was recorded at 6 dB back-off over the frequency range of 1.72-2.27 GHz. The DPA prototype was successfully linearized when driven with wideband (up to 160 MHz instantaneous bandwidth) and dual-band (up to 300 MHz carrier separation) modulated stimuli and achieved an average drain efficiency in excess of 45%.

Comments are closed.