@article{10902/21918,
year = {2021},
month = {6},
url = {http://hdl.handle.net/10902/21918},
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.},
organization = {This work was supported by the Spanish Ministry of Science, Innovation and Universities under Project TEC2017-83343-C4-1-R, cofunded by the European Fund for Economic and Regional Development (FEDER). The work of David Vegas was supported by the Spanish Ministry of Science, Innovation and Universities under Grant BES-2015-072203.},
publisher = {Institute of Electrical and Electronics Engineers, Inc.},
publisher = {IEEE Microwave and Wireless Components Letters, 2021, 31(6), 713-716},
publisher = {IEEE/MTT-S International Microwave Symposium (IMS), Atlanta, GA, USA, 2021},
title = {Current-injected load-modulated outphasing amplifier for extended power range operation},
author = {García García, José Ángel and Ruiz Lavín, María de las Nieves and Cordero Pinillos, Ana and Vegas Bayer, David},
}