A 112W GaN dual input Doherty-Outphasing Power Amplifier

Qureshi, Abdul Raheem; Acar, Mustafa; Qureshi, Jawad; Wesson, Robin; Vreede, L.C.N. de

doi:10.1109/mwsym.2016.7540194

Cited by 23 publications

(16 citation statements)

References 7 publications

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“…Moreover, similarly to the Doherty PA case, the HEPR can be further enhanced by adopting multi-way/multi-stage architectures [103], while even better results are obtained by combining the outphasing architecture with other back-off efficiency enhancement techniques, such as the supply-modulated outphasing PA [104] or the Doherty-Outphasing PA [97,105,106].…”

Section: High Efficiency Power Range and Stabilitymentioning

confidence: 99%

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

et al. 2017

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Abstract:Modern mobile communication signals require power amplifiers able to maintain very high efficiency in a wide range of output power levels, which is a major issue for classical power amplifier architectures. Following the load-modulation approach, efficiency enhancement is achieved by dynamically changing the amplifier load impedance as a function of the input power. In this paper, a review of the widely-adopted Doherty power amplifier and of the other load-modulation efficiency enhancement techniques is presented. The main theoretical aspects behind each method are introduced, and the most relevant practical implementations available in recent literature are reported and discussed.

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Section: High Efficiency Power Range and Stabilitymentioning

confidence: 99%

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

et al. 2017

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“…with α as defined in (14). For the continuous Class F −1 mode of operation, the current formulation in (20) is used [54]:…”

Section: A Theory Applied To Current Source Active Devicesmentioning

confidence: 99%

“…A theoretical constant efficiency of 78.5%, 90.7% and 81.5% can be obtained for the Class B/J, F and F −1 modes based on the waveforms in Eq. (6), (7), (16) and (20), when the knee voltage V knee is assumed to be 0. When the optimal load modulation trajectories are followed, a constant efficiency is theoretically maintained throughout back-off.…”

Section: A Theory Applied To Current Source Active Devicesmentioning

confidence: 99%

“…Amplitude modulation of the original signal is reconstructed by vectorial summation of the output of each branch in the combiner. Because of this advantage, outphasing has received renewed interest in recent years [20], [21], [29], [36]- [39]. Nevertheless, the reactive loading which each PA branch is presented with, during non-isolating outphasing operation is a significant obstacle to its implementation [13].…”

Section: Introductionmentioning

confidence: 99%

“…In outphasing systems employing Chireix reactive compensating techniques, the branch amplifiers are typically designed as class E [20]- [26], F [27], F −1 [28], [29] power amplifiers or as saturated class B amplifiers [30], [31]. Recently in [21], continuous class E theory was utilised in the design of a wideband outphasing system showing promising results.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Load Modulation of Harmonically Tuned Amplifiers and Application to Outphasing Systems

Falco

Pednekar

Mimis

et al. 2017

IEEE Trans. Microwave Theory Techn.

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Modulation of load impedance is an effective way to maintain efficient power amplifier (PA) operation over high dynamic range modulated signals. For high efficiency, a load modulation approach can be applied to inherently efficient classes of PAs such as those with harmonic tuning: class J, class F, and inverse class F. This paper presents an analysis of harmonically tuned amplifiers operating under load modulation conditions, deriving the optimal loading trajectories for these multiple classes of operation. Because these load trajectories are complex, it is then shown-through a series of analysis, simulations and measurements-that harmonically tuned amplifiers are better suited for outphasing systems, than conventional amplifiers such as class B. A design methodology is proposed and validated through design and measurement of a 900 MHz outphasing system, comprising of two Gallium Nitride (GaN) class J branch PAs, delivering 44.6 dBm with 75% PAE at saturation, while mantaining PAE above 60% over a 7 dB output power back-off.

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High Efficiency and High Output Power HFET GaN Doherty Power Amplifier with Linearity Region Extension for Wireless Applications

Kangarshahi

Zahedi

2022

Circuits Syst Signal Process

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A 112W GaN dual input Doherty-Outphasing Power Amplifier

Cited by 23 publications

References 7 publications

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

Load Modulation of Harmonically Tuned Amplifiers and Application to Outphasing Systems

High Efficiency and High Output Power HFET GaN Doherty Power Amplifier with Linearity Region Extension for Wireless Applications

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