A postmatching concurrent dual-band Doherty power amplifier with enhanced bandwidth

Meng, Fan; Zhu, Xiao‐Wei; Xia, Jing; Yu, Chao

doi:10.1002/mmce.21514

Cited by 5 publications

(4 citation statements)

References 24 publications

(48 reference statements)

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“…To extend the bandwidth, multiband DPAs were designed through theoretical analysis of the influence of the offset line's phase delay in multiple frequencies 7 . In Reference [8], a postmatching concurrent dual‐band DPA with enhanced bandwidth was proposed with the bandwidth of up to 400 MHz at each band. However, most of these dual‐band/multiband DPAs adopt a symmetrical configuration with a power ratio of 1:1, and their BOP range is always limited to about 6 dB, which cannot meet the requirements of future mobile communication systems with high PAPRs (up to 9 dB or even more) 4–8 .…”

Section: Introductionmentioning

confidence: 99%

“…In Reference [8], a postmatching concurrent dual‐band DPA with enhanced bandwidth was proposed with the bandwidth of up to 400 MHz at each band. However, most of these dual‐band/multiband DPAs adopt a symmetrical configuration with a power ratio of 1:1, and their BOP range is always limited to about 6 dB, which cannot meet the requirements of future mobile communication systems with high PAPRs (up to 9 dB or even more) 4–8 . To further boost efficiency of future wireless communication systems, it is desirable to design dual‐band/multiband DPAs with higher BOP range over a wide frequency band.…”

Section: Introductionmentioning

confidence: 99%

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A 9 dB back‐off dual‐band asymmetric Doherty power amplifier using dual peaking amplifiers for reactance compensation

Xia

Xie

Kong

et al. 2022

Micro & Optical Tech Letters

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This paper proposes a dual‐band asymmetric Doherty power amplifier (ADPA) with 9 dB power back‐off range using dual parallel peaking amplifiers to realize reactance compensation for wideband operation at two frequency bands. To achieve dual‐band amplification, the specific phase delays of the carrier and peaking output matching networks (OMNs) required on the two target frequency bands were determined using the phase delay period repeatability principle combined with the Doherty impedance transformation first. Then, the carrier and peaking OMNs were designed according to the desired phase delay. More specifically, two parallel peaking amplifiers using the low‐order impedance transformation network were combined to generate the desired compensating reactance at the back‐off power range for wideband operation. For verification, a dual‐band ADPA operating over 2.35–2.75 and 3.2–3.6 GHz frequency bands was designed and measured. Experimental results show that, for the two frequency bands, the efficiencies at saturation are 53.6%–64.3% and 48%–67.8%, with the 9 dB back‐off efficiencies reaching 41.5%–53.3% and 40.5%–52.8%, respectively. When stimulated by a 20 MHz modulated signal, the designed ADPA can achieve the adjacent channel leakage ratio of −48 dBc after linearization.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A 9 dB back‐off dual‐band asymmetric Doherty power amplifier using dual peaking amplifiers for reactance compensation

Xia

Xie

Kong

et al. 2022

Micro & Optical Tech Letters

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“…The development of mobile communication technology, for instance the upcoming 5G applications, sets higher requirements on drain efficiency for power amplifiers. Doherty power amplifiers are high in efficiency at the back‐off power range due to the presence of active load modulation, which is suitable for fifth‐generation mobile communications with high peak to average power ratio (PAPR) modulation signals . Therefore, Doherty has attracted researchers' attention for decades.…”

Section: Introductionmentioning

confidence: 99%

Efficiency‐enhanced Doherty power amplifier using Chireix‐like compensation technology

Zhang

Cheng

et al. 2019

Int J RF Microw Comput Aided Eng

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This article presents a novel efficiency-enhanced Doherty power amplifier (DPA) by using a Chireix-like compensation technique. This technique introduces a compensation circuit structure at the combiner to offset the phase difference effect of a DPA for enhancing drain efficiency. A DPA based on the proposed structure is fabricated with two 10 W GaN high electron mobility transistor (HEMT) transistors. The fabricated DPA with such proposed compensation structure manifests a measured saturated output power of 43.5 dBm and drain efficiency of 68% to 71% in the frequency range of 3.2 to 3.7 GHz. Forty-five percent of drain efficiency can be achieved at 6 dB power back-off. And the adjacent channel leakage ratio (ACLR) is better than −48.6 dBc with digital predistortion. K E Y W O R D SChireix-like compensation technique, Doherty power amplifier, efficiency-enhanced, phase difference

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“…Concurrent dual-band or multi-band DPA is another common way to meet the requirement of higher data transmission rate combined with the carrier aggregation technology. Up to now, a large number of concurrent dual-band DPAs are implemented with T-shaped or π-shaped dual-band impedance inverter network (IIN) and IIN with minimum phase delay [19,20]. In [21] concurrent tri-band and quad-band DPAs are designed and fabricated after theoretically analysing the influence of the offset line's phase in multiple frequencies.…”

mentioning

confidence: 99%

Bandwidth‐extended single‐input switchable Doherty power amplifier based on dual compensating reactance with adjusted drain voltage

Liu

Zhu

Xia

et al. 2021

IET Microwaves Antenna & Prop

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This study presents a switchable Doherty power amplifier (S-DPA) based on dual compensating reactance and adjusted drain voltage with 124% fractional bandwidth (FBW) using single-input architecture. The proposed S-DPA can be operated in wideband mode (WB-MOD) and dual-band mode (DB-MOD) with a larger power back-off region through one-click switching directly. The needed back-off impedance in both operation modes is achieved by using the dual compensating reactance for bandwidth extension. Meanwhile, a load modulation enhancement technique through adjusting the drain voltage of both the carrier and peaking amplifiers is proposed for proper load modulation in DB-MOD. To verify the proposed techniques, an S-DPA was designed and fabricated. Measurement results show that the proposed S-DPA has an efficiency of 51.3%-70.3% at saturated power of higher than 43.4 dBm over the frequency band of 0.8-3.4 GHz with 124% FBW. The 6-dB back-off efficiency in WB-MOD (1.3-2.9 GHz) is 45.3%-56.1% and the 8-dB back-off efficiency in DB-MOD (0.8-1.3 GHz & 2.9-3.4 GHz) is 41.6%-57.9%. 80-MHz modulated signals with 6.2-dB and 8.2-dB peak to average power ratios are used to evaluate the modulated signal performance in two modes. The DPA can achieve an average efficiency of up to 56% with high linearity after digital pre-distortion linearisation. | INTRODUCTIONWith the development of the modern wireless communication techniques, the peak-to-average power ratios (PAPRs) of the modulated signals are becoming higher and higher. It is quite essential to improve the efficiency of the power amplifiers at a large output power back-off (PBO). Doherty power amplifier (DPA) is one of the most popular ways to improve efficiency at the back-off power level, because of its simple and reliable structure [1][2][3][4][5]. At the same time, the higher data transmission rate for the next generation of mobile communication networks (5G) requires a larger signal bandwidth. Due to the increasing scarcity of spectrum resources, the 5G wireless communication system will employ new core-air interfaces with a frequency band from 3 to 6 GHz. For example, Band N77 from 3.3 to 4.2 GHz and Band N79 from 4.4 to 5.5 GHz. Meanwhile, some of the long-term evolution (LTE) bands below 3 GHz will continue to be used in the upcoming 5G wireless communication systems. For example, the 3GPP Bands No. 19 of 830-890 MHz, No. 40 of 2300-2400 MHz, and No. 41 of 2496-2690. These application requirements bring greater challenges to wideband highefficiency DPA design.One way to meet this requirement is designing wideband DPA. Various design approaches have been reported to extend the bandwidth of DPA by modifying the output matching networks (OMNs), such as low-order matching network [8,9], post-matching networks [10, 11], integrated compensatingThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for comm...

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A postmatching concurrent dual-band Doherty power amplifier with enhanced bandwidth

Cited by 5 publications

References 24 publications

A 9 dB back‐off dual‐band asymmetric Doherty power amplifier using dual peaking amplifiers for reactance compensation

A 9 dB back‐off dual‐band asymmetric Doherty power amplifier using dual peaking amplifiers for reactance compensation

Efficiency‐enhanced Doherty power amplifier using Chireix‐like compensation technology

Bandwidth‐extended single‐input switchable Doherty power amplifier based on dual compensating reactance with adjusted drain voltage

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