Efficiency First: Outphasing Architectures for Power Amplification of High-PAPR Signals

Barton, Taylor W.

doi:10.1109/csics.2015.7314498

Cited by 3 publications

(2 citation statements)

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“…Outphasing is a concept of improving efficiency at high PAPR values, which is well-known from analog PAs. It has been applied to digital PAs as well [8][9][10][11], but up to now, this was done only for PAs with small output power P out levels, below [8] or around 1 W [10], or at low frequencies (30…600 MHz) [11].…”

Section: Introductionmentioning

confidence: 99%

“…This is achieved by applying a circuit topology for resonant commutation to both final stages, similar to that shown in [8]. The outputs of both amplifier branches are combined with two discrete inductors; no transformer or spaceconsuming elements such as high-Q filters are required in the output network [9]. Furthermore, due to its broadband design, the proposed PA can be used from the concept point of view for other frequencies as well.…”

Section: Introductionmentioning

confidence: 99%

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GaN digital microwave outphasing PA

Hoffmann

Wentzel

Flisgen

et al. 2020

Int. J. Microw. Wireless Technol.

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This paper presents a novel GaN-based digital outphasing power amplifier (PA) for the 800 MHz range. The PA reaches a maximum output power of 5.8 W at 30 V final-stage (FS) drain supply voltage. A novel output combiner circuit is used and efficiency is improved by resonant commutation of the FSs and optimized driver circuits for the two GaN push-pull FSs. 3D electromagnetic simulation of output network has been conducted to extract an equivalent circuit model and to access full information in terms of functionality and broadband impedance characteristics for optimized outphasing operation in the final design. Measured total efficiencies (ηtot) of 59 and 25% at 0 and 10 dB power back-off are achieved, respectively, fitting the simulation quite well. The proposed digital outphasing module is a promising candidate for fully digitized base-station architectures in future wireless communications.

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