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Current-injected load-modulated outphasing amplifier for extended power range operation

Abstract: In this letter, the power range to be covered with maximized efficiency by a two-way outphasing power amplifier (PA) is significantly extended thanks to a proposed architecture with injection of an external signal. Using a reactively terminated quadrature hybrid coupler (QHC) as non-isolating combiner, the Chireix topology is transformed into a slight variation of the Load- Modulated Balanced Amplifier (LMBA) when the auxiliary branch is activated. This combined LM strategy provides a nearly resistive loading of the individual outphasing PAs over a wide power range. An appropriate output network, approximating a class-E/F2 operation of the selected GaN HEMT device under such loading condition, leads to remarkable drain efficiency figures at deep output power back-off (OPBO). Values higher than 80%, 70% and 60% have been measured at power levels 9.5 dB, 13.3 dB and 15 dB below its peak (45.7 dBm), respectively. A 5 MHz LTE signal with a peak-to-average power ratio (PAPR) as high as 12.65 dB has been reproduced with an average efficiency above 62% and worst case adjacent channel leakage ratio (ACLR) of -31 dBc.

 Autoría: Garcia J.A., Nieves Ruiz M., Cordero A., Vegas D.,

 Congreso: IEEE MTT-S International Microwave Symposium: IMS (2021 : Atlanta, Estados Unidos)

 Fuente: IEEE Microwave and Wireless Components Letters, 2021, 31(6), 713-716

Editorial: Institute of Electrical and Electronics Engineers, Inc.

 Fecha de publicación: 01/06/2021

Nº de páginas: 4

Tipo de publicación: Artículo de Revista

 DOI: 10.1109/LMWC.2021.3062150

ISSN: 1531-1309,1558-1764

Proyecto español: TEC2017-83343-C4-1-R

Url de la publicación: https://doi.org/10.1109/LMWC.2021.3062150

Autores/as

MARIA DE LAS NIEVES RUIZ LAVIN

ANA CORDERO PINILLOS

DAVID VEGAS BAYER