Dual-Band Dual-Output Doherty Power Amplifier for Unsynchronized Time-Division Duplexing
Journal article, 2023

Conventional multiband power amplifiers (PAs), when working in time-division duplex (TDD), require the transmit–receive intervals of all bands to be synchronized. This is an undesirable constraint in modern radio base stations. This article proposes a dual-output dual-band Doherty PA (DB-DPA) that enables the loading of one band to be switched on-and-off without impacting the other band in normal transmission. A thorough analysis of the proposed dual-output DB-DPA architecture is presented, and a dual-output DB-DPA prototype operating at 1.4 and 2.6GHz has been designed as a proof of concept. The large-signal measurements of the prototype DB-DPA indicate Doherty behavior at both frequencies with over 56% saturation efficiency and 45% efficiency at 6-dB power back-off (PBO). Furthermore, single-band and concurrent dual-band linearized modulated measurements, using 10-MHz new radio (NR) signals with 6-dB peak-to-average power ratio (PAPR), demonstrate the linearizability of the proposed DB-DPA and its usefulness for unsynchronized TDD applications.

energy efficiency

power amplifier (PA)

dual output

Doherty

dual band

GaN-HEMT

Author

Paul Saad

Ericsson

Yonghai Jin

Ericsson

Christian Fager

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Rui Hou

Ericsson

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN) 15579670 (eISSN)

Vol. 71 11 4826-4840

Subject Categories (SSIF 2011)

Telecommunications

DOI

10.1109/TMTT.2023.3240526

More information

Latest update

2/26/2025