A 83-W, 51% GaN HEMT Doherty power amplifier for 3.5-GHz-band LTE base stations

Kato, Katsuya; Miwa, Shuichiro; Teranishi, Eri; Kosaka, Naoki; Fujii, K.; Yamabe, Shinichi; Asada, T.; Horiguchi, Kenichi; Sasaki, Y.; Inoue, Akihisa; Katayama, Hideki

doi:10.1109/eumc.2016.7824407

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…The carrier amplifier is designed to operate as a class AB amplifier whereas the peaking amplifier is designed to operate as class C amplifier. The input signal is split between the two amplifiers, where the carrier amplifier should be saturated at the back-off input power; at the same power level, the peaking amplifier starts feeding current to the output till it becomes saturated at the peak region, where the two power amplifiers give their maximum designed output power [5][6][7].…”

Section: Doherty Conceptmentioning

confidence: 99%

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A 70-W Asymmetrical Doherty Power Amplifier for 5G Base Stations

Abdulkhaleq

Al‐Yasir

Parchin

et al. 2018

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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Much attention has been paid to making 5G developments more energy efficient, especially in view of the need for using high data rates with more complex modulation schemes within a limited bandwidth. The concept of the Doherty power amplifier for improving amplifier efficiency is explained in addition to a case study of a 70W asymmetrical Doherty power Amplifier using two GaN HEMTs transistors with peak power ratings of 45W and 25W. The rationale for this choice of power ratio is discussed. The designed circuit works in the 3.4GHz frequency band with 200 MHz bandwidth. Rogers RO4350B substrate with dielectric constant εr=4.66 and thickness 0.035 mm is used. The performance analysis of the Doherty power amplifier is simulated using AWR MWO software. The simulated results showed that 54-64% drain efficiency has been achieved at 8 dB back-off within the specified bandwidth with an average gain of 10.7 dB.

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Section: Doherty Conceptmentioning

confidence: 99%

“…The idea of the Doherty depends on the so-called active load-pull technique [1]. Where The operation of the Doherty power amplifier can be divided into three main regions [5][6][7][8][9]:…”

Section: Fig 1 Doherty Power Amplifier Structure [2]mentioning

confidence: 99%

A 70-W Asymmetrical Doherty Power Amplifier for 5G Base Stations

Abdulkhaleq

Al‐Yasir

Parchin

et al. 2018

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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show abstract

“…To do so, several techniques have been proposed, such as the outphasing power amplifier [2], Doherty amplifier [3], and sequential power amplifier [4]. Among the above-mentioned techniques, the Doherty power amplifier (DPA) is considered as the most suitable technique due to its simple structure, ease of implementation, and high performance [5]- [9]. However, conventional DPAs can only maintain moderate efficiency at 6 dB BO level [10], which does not satisfy the requirements of modern wireless communication systems.…”

Section: Introductionmentioning

confidence: 99%

High efficiency Doherty power amplifiers for modern wireless communication systems: A brief review

Mabrok

Zakaria

Sutikno

2021

IJEECS

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Due<span lang="EN-MY">to the high peak to average power ratio (PAPR) of modern modulated signals, power amplifiers (PAs) have been forced to operate at the back-off (BO) region of their saturation power in order to avoid signal clipping and distortion. However, classical PAs suffer from low efficiency in the BO region operation. Therefore, efficiency has to be enhanced in that region. Many techniques have been proposed. Among them, the Doherty power amplifier (DPA) is considered as the most suitable technique due to its simple structure and high performance. However, its conventional design is limited to a 6 dB BO level, which does not satisfy the requirements of modern communication systems. In this paper, a brief review of the most significant techniques of high-efficiency DPA is presented. First, DPA topology and its operation principles are briefly discussed. Second, efficiency enhancement techniques such as an asymmetrical DPA, output combiner modification, gate bias adaption, offset line optimization, and multi-way DPA were discussed. The study shows that the most suitable, simple, and effective solution is an asymmetrical approach. However, it needs to be investigated in terms of bandwidth in order to meet the efficiency-bandwidth requirements of modern wireless communication systems such as </span>5G.

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“…Among all of these techniques, DPA is considered as the most suitable technique for modern wireless communication signals with high PAPR. This is mainly due to its simple structure, ease of implementation, and high performance especially the efficiency at the BO [11]- [15]. However, conventional DPAs are limited to 6 dB BO level which are unable to satisfy the requirements of modern wireless communication systems such as the upcoming 5G.…”

Section: Introductionmentioning

confidence: 99%

High efficiency Doherty power amplifier based on asymmetrical matching network

Mabrok

Zakaria

Sutikno

2021

IJEECS

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Doherty power amplifier (DPA) with high efficiency at the output power back off is highly demanded for modern wireless communication systems to achieve high data rates and reduce the power consumption and operation costs. This paper presents a new design strategy for enhancing DPA’s back-off efficiency. New design strategy called asymmetrical matching network is used to achieve asymmetric operation, which helps to compensate for the low power delivered by the peaking stage in the conventional DPA. The simulation results showed an enhancement in the back-off efficiency, where the proposed design is able toachieve 46-52% drain efficiency at 8 dB output power back-off while maintains high efficiency of 73-80 % at saturation over the designed bandwidth of 3.4-3.6 GHz. The proposed design is suitable for high efficiency sub-6 GHz fifth-generation wireless applications.<br /><div> </div>

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A 83-W, 51% GaN HEMT Doherty power amplifier for 3.5-GHz-band LTE base stations

Cited by 6 publications

References 10 publications

A 70-W Asymmetrical Doherty Power Amplifier for 5G Base Stations

A 70-W Asymmetrical Doherty Power Amplifier for 5G Base Stations

High efficiency Doherty power amplifiers for modern wireless communication systems: A brief review

High efficiency Doherty power amplifier based on asymmetrical matching network

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