Linearization Technologies for High Efficiency Power Amplifier of Cellular Base Stations

Yasunori SUZUKI

IEICE TRANSACTIONS on Electronics   Vol.E104-C    No.10    pp.534-542
Publication Date: 2021/10/01
Publicized: 2021/03/24
Online ISSN: 1745-1353
DOI: 10.1587/transele.2021MMI0009
Type of Manuscript: Special Section INVITED PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
feed-forward,  predistortion,  power amplifier,  cellular base station,  

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This paper presents linearization technologies for high efficiency power amplifiers of cellular base stations. These technologies are important to actualizing highly efficient power amplifiers that reduce power consumption of the base station equipment and to achieving a sufficient non-linear distortion compensation level. It is well known that it is very difficult for a power amplifier using linearization technologies to achieve simultaneously high efficiency and a sufficient non-linear distortion compensation level. This paper presents two approaches toward addressing this technical issue. The first approach is a feed-forward power amplifier using the Doherty amplifier as the main amplifier. The second approach is a digital predistortion linearizer that compensates for frequency dependent intermodulation distortion components. Experimental results validate these approaches as effective for providing power amplification for base stations.