A Novel 1.4-4.8 GHz Ultra-Wideband, over 45% High Efficiency Digitally Assisted Frequency-Periodic Load Modulated Amplifier

We report an ultra-wideband and high efficiency sub-6GHz power amplifier, which is based on periodically varied load modulation with frequency. Key novelties are frequency-periodic load modulation over multiple contiguous frequency bands combined with digitally assisted dual-input configuration, whi...

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Bibliographic Details
Main Authors: Komatsuzaki, Yuji, Rui Ma, Benosman, Mouhacine, Nagai, Yukimasa, Sakata, Shuichi, Nakatani, Keigo, Shinjo, Shintaro
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
dual-input power amplifier
Field effect transistors
Frequency measurement
Frequency modulation
GaN
load modulation
PAE
power amplifier
Power amplifiers
Power transmission lines
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Summary:We report an ultra-wideband and high efficiency sub-6GHz power amplifier, which is based on periodically varied load modulation with frequency. Key novelties are frequency-periodic load modulation over multiple contiguous frequency bands combined with digitally assisted dual-input configuration, which provides optimum signal combination, magnitude and phase of dual-input signals. The amplifier using 0.15-μm GaN HEMT FETs achieved drain efficiency of 45-62% over 1.4-4.8GHz that is 110% fractional bandwidth at 6dB power back-off. This, to the best of the authors' knowledge, is the widest fractional bandwidth reported so far for a load modulated amplifier at these frequency range. It is a very promising PA technology for 5G base station, enabling reduction of the total cost of ownership (TCO) for operators.
ISSN:2576-7216
DOI:10.1109/MWSYM.2019.8700930