A Broadband High-Efficiency Doherty Power Amplifier With Integrated Compensating Reactance

Xia, Jing; Yang, Miaomiao; Guo, Yan; Zhu, Anding

doi:10.1109/tmtt.2016.2574861

Cited by 127 publications

(99 citation statements)

References 25 publications

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“…To validate the linearity performance, the DPA was driven by a 20 MHz LTE signal with PAPR about 7 dB at the carrier frequency of 2.55 GHz, and then was linearized by using the digital predistortion (DPD) technique [21]. Fig.…”

Section: Realization and Experimental Resultsmentioning

confidence: 99%

“…To achieve the design targets mentioned above, the two-point matching approach proposed in [21] can be employed. Taking the carrier OMN design for example, by using S 11 and the phase of S 21 (θ 21 ) of the carrier OMN, the relationships between the load impedances, i.e., Z C sat , Z dC sat , Z C low and Z dC low , can be expressed as…”

Section: Circuit Design and Simulationsmentioning

confidence: 99%

“…This results in the degradation of back-off efficiency and limits the bandwidth of the DPA. Although several designs have been proposed to extend the bandwidth [10][11][12][13][14][15][16][17][18][19][20][21][22], many of them are still complicated for realization. Recently, a novel output combiner employing a resonance LC tank was reported in the frequency band of 0.7-0.95 GHz [15].…”

Section: Introductionmentioning

confidence: 99%

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A Wideband Doherty Power Amplifier With Shunted Reactive Load for Efficiency Enhancement

Kong¹,

Xia²,

Ding³

et al. 2017

PIER C

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Abstract-A highly efficient Doherty power amplifier (DPA) using shunted reactive load is designed to achieve wideband operation. For enhanced back-off efficiency over the whole bandwidth, a modified load modulation network (LMN), which employs a shunted reactive load at the combining point, was firstly designed to enlarge the effective load impedance of the carrier amplifier at low and high frequencies. Then, the two-point matching approach was employed to design the carrier and peaking output matching networks, which can eliminate the use of offset lines and simplify the LMN. Measurement results show that the designed DPA can deliver an efficiency of 48%-61% at 6 dB back-off power over the frequency band of 2.2-2.9 GHz. For a 20 MHz LTE modulated signal, an average efficiency of higher than 55% can be achieved at an average output power of 37 dBm, while the adjacent channel leakage ratio is below −49 dBc after linearization.

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Section: Realization and Experimental Resultsmentioning

confidence: 99%

Section: Circuit Design and Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Wideband Doherty Power Amplifier With Shunted Reactive Load for Efficiency Enhancement

Kong¹,

Xia²,

Ding³

et al. 2017

PIER C

Self Cite

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show abstract

“…However, with the application of high order modulation technologies, the 6 dB OBO can no longer meet the system requirements, and the design of the DPA with extended power back‐off range is an urgent problem to be solved. In addition, as the signal bandwidth is getting larger and larger, the design of broadband DPA is also one of the research hotspots …”

Section: Introductionmentioning

confidence: 99%

A novel design method for extending power back‐off range of broadband Doherty power amplifier

Jin

Dang

Yang

et al. 2019

Micro & Optical Tech Letters

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In this article, a novel design method for extending the output back‐off (OBO) range of the Doherty power amplifier (DPA) is proposed. The influence of the power ratio of the peaking and carrier power amplifier on the bandwidth of the DPA is analyzed in detail. With the proposed theory, the simplified estimation of the bandwidth of the DPA for a specific OBO range can be carried out. A broadband high‐efficiency DPA working from 1.8 to 2.6 GHz (33% relative bandwidth) with 9 dB OBO level is designed to verify the proposed method. According to the measured results, the DPA achieves 44.6 to 46.8 dBm saturation output power and drain efficiency (DE) of 61% to 74%. And at 9 dB OBO level, the DE varies from 50% to 63% over the operation band. Furthermore, digital predistortion (DPD) measurement results show that the linearized DPA can meet the spectral requirements for modern wireless communication systems.

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“…Various approaches and structures can be employed to realize a broadband PA, including a balanced-unbalanced load [8], an equalizer [9]- [10], an envelope modulator [11]- [12], a push-pull structure [13], a cascade [14]- [15], or a Doherty structure [16]- [17], but these are not able to simultaneously realize high-efficiency and high gain flatness at maximum output power.…”

Section: Introductionmentioning

confidence: 99%

Systematic Approach for Design of Broadband, High Efficiency, High Power RF Amplifiers

Mohadeskasaei¹,

An²,

Chen³

et al. 2017

ETRI J

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This paper demonstrates a systematic approach for the design of broadband, high efficiency, high power, Class-AB RF amplifiers with high gain flatness. It is usually difficult to simultaneously achieve a high gain flatness and high efficiency in a broadband RF power amplifier, especially in a high power design. As a result, the use of a computer-aided simulation is most often the best way to achieve these goals; however, an appropriate initial value and a systematic approach are necessary for the simulation results to rapidly converge. These objectives can be accomplished with a minimum of trial and error through the following techniques. First, signal gain variations are reduced over a wide bandwidth using a proper pre-matching network. Then, the source and load impedances are satisfactorily obtained from small-signal and load-pull simulations, respectively. Finally, two highorder Chebyshev low-pass filters are employed to provide optimum input and output impedance matching networks over a bandwidth of 100 MHz-500 MHz. By using an EM simulation for the substrate, the simulation results were observed to be in close agreement with the measured results.Keywords: Broadband, Class-AB, Matching network, Power amplifier. Manuscript received June 28, 2016; revised Oct. 7, 2016; accepted Oct. 17, 2016. Seyed Alireza Mohadeskasaei (corresponding author, alireza.kasaee@gmail.com), Jianwei An (ajw626@126.com), Yueyun Chen (chenyy@ustb.edu.cn), Zhi Li (lizhi870218@gmail. com), Sani Umar Abdullahi (umarsani@gmail.com), and Tie Sun (suntie1605@163.com) are with the Department of Communication, School of Computer and Communication, University of Science and Technology Beijing, China. This is an Open Access article distributed under the term of Korea Open Government License (KOGL) Type 4: Source Indiction + Commercial Use Prohibition + Change Prohibition (http://www.kogl.or.kr/news/dataFileDown.do?dataIdx=71&dataFileIdx=2). I. IntroductionPower amplifiers (PAs) are one of the most significant ingredients of many communication systems. Four important requirements, namely, the efficiency, linearity, low noise, and broadband frequency response, must be considered when designing PAs [1]- [3]. For broadband power amplifiers, one of the most difficult challenges lies in determining how to achieve a high signal gain and high power level while maintaining a low power dissipation. In other words, how to achieve high efficiency. At the same time, gain variation throughout the band causes more challenges for modern signal modulation techniques, such as quadrature amplitude modulation.In wideband applications, linear classes, such as Class-A, Class-B, and Class-AB, are widely employed because they provide appropriate bandwidths and acceptable signal gains [4]- [5], but their efficiency is not as high as that of harmonictuned classes, such as Class-E and Class-F [6]- [7]. Various aspects resulting from recent research on broadband PAs are summarized in Table 1. According to this table, a Class-F PA exhibits a high power-added efficiency (P...

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A Broadband High-Efficiency Doherty Power Amplifier With Integrated Compensating Reactance

Cited by 127 publications

References 25 publications

A Wideband Doherty Power Amplifier With Shunted Reactive Load for Efficiency Enhancement

A Wideband Doherty Power Amplifier With Shunted Reactive Load for Efficiency Enhancement

A novel design method for extending power back‐off range of broadband Doherty power amplifier

Systematic Approach for Design of Broadband, High Efficiency, High Power RF Amplifiers

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