A 1–3-GHz Digitally Controlled Dual-RF Input Power-Amplifier Design Based on a Doherty-Outphasing Continuum Analysis

Andersson, Cristina; Gustafsson, David; Cahuana, Jessica Chani; Hellberg, Richard; Fager, Christian

doi:10.1109/tmtt.2013.2280562

Cited by 108 publications

(32 citation statements)

References 14 publications

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“…An even signal distribution in the low power region, together with an uneven one in favour of the Auxiliary in the Doherty region, is optimum for linearity and flat-gain response [94], while a frequency-dependent signal decomposition scheme is proposed in [95] to improve DPA bandwidth. A further bandwidth enhancement is obtained in [96], by resorting to a digital equalizer, and in [97], where instead, a mixed DPA-outphasing dual-input architecture is proposed. Recently, in [98], a wide-band dual-input Doherty was demonstrated, relying on a quasi-MMIC (Monolithic Microwave Integrated Circuit) technology, with the IIN realized as a high-pass filter to minimize the components' count and the inductor losses.…”

Section: Digital/dual-input Dpamentioning

confidence: 99%

“…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%

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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: Digital/dual-input Dpamentioning

confidence: 99%

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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“…A more extensive analysis on digital DPA operation is performed in [45]: a continuum between Doherty and Outphasing harmonic loading conditions of the devices is demonstrated under ideal conditions, studying a dual-digitally driven DPA. For the actual implementation, a combiner assuming nonideal harmonic closure is analyzed and designed, showing possible good efficiency level.…”

Section: B Digital Dpamentioning

confidence: 99%

The Doherty Power Amplifier: Review of Recent Solutions and Trends

Camarchia

Pirola

Quaglia

et al. 2015

IEEE Trans. Microwave Theory Techn.

210

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In this paper, an extensive review of the most up-to-date papers on microwave Doherty power amplifiers is presented. The main applications are discussed, together with the employed semiconductor technologies. The different research trends, all aimed to improve the advantages of the Doherty scheme and to solve its inherent drawbacks, are presented. The first considered topic is the maximization of efficiency and/or linearity, where analog and digital techniques are exploited. Another important trend is the bandwidth enlargement of the Doherty architecture, that involves a large number of papers. Multi-band, multi-mode solutions are also considered, using either fixed or reconfigurable solutions. The final section is dedicated to the most significant Doherty integrated implementations.Index Terms-Doherty power amplifier, gallium arsenide, gallium nitride, linearization, wireless communications.

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“…The complete outphasing PA system performance is measured simultaneously with a power meter at the output of the combiner as in [3]. During measurement, RF voltages and currents at ports 2, 3 and 4 are acquired sequentially with a common port 1 measurement.…”

Section: Internal Load Modulation Measurementsmentioning

confidence: 99%

“…Individual performance of the main and peaking amplifiers in a Doherty PA were also reported using a non-contact near-field technique [2]. The input waveforms of a broadband Doherty-outphasing PA using a 2-port LSNA are used to determine input phase, while the output is only measured with a power meter in [3]. The results presented here further the understanding of the outphasing PA through internal circuit measurements at both input and output of the internal PAs during full outphasing operation.…”

Section: Introductionmentioning

confidence: 99%

X-Band outphasing power amplifier with internal load modulation measurements

Litchfield¹,

Reveyrand²,

Popović³

2014

2014 44th European Microwave Conference

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Abstract-This paper presents a general measurement based design method for outphasing amplifiers. Both isolated and nonisolated combiners are designed based on individual PA loadpull measurements, in order to load modulate two 0.15µm GaN MMIC power amplifiers at 10.1 GHz. Load modulation measurements are performed at ports internal to the PA, with the inclusion of couplers in the combiner and a four-port LSNA, to gain insight into the dynamics of load modulation during outphasing operation. Both outphasing systems exhibit a peak PAE greater than 41.5 % at a peak output power greater than 35.7 dBm.

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A 1–3-GHz Digitally Controlled Dual-RF Input Power-Amplifier Design Based on a Doherty-Outphasing Continuum Analysis

Cited by 108 publications

References 14 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

The Doherty Power Amplifier: Review of Recent Solutions and Trends

X-Band outphasing power amplifier with internal load modulation measurements

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