Mutual Coupling Effect on Three-Way Doherty Amplifier for Green Compact Mobile Communications

Abdulkhaleq, Ahmed M.; Yahya, Maan A.; Parchin, Naser Ojaroudi; Al‐Yasir, Yasir I. A.; Sajedin, Maryam; Elfergani, Issa; Abd‐Alhameed, Raed A.; Rayit, Ashwain; Rodrı́guez, Jonathan

doi:10.23919/eucap48036.2020.9135900

Cited by 8 publications

(7 citation statements)

References 8 publications

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“…The Doherty amplifier operation is explained in detail in many materials; [4][5][6][7][8][9]; however, a short summary will be provided. W. Doherty, in 1936, came up with a new concept for combining two amplifiers outputs [15], Doherty used a quarter-wavelength transmission line and two tube amplifiers.…”

Section: Theory Of Class F Amplifiermentioning

confidence: 99%

“…The efficiency of power amplifiers can be achieved at the saturation region. Nevertheless, for modulated signals with high PAPR, power amplifiers should be operated at the backed-off region that is far from the most efficient point to keep the required linearity performance, however, the efficiency drops sharply [2][3][4][5][6][7][8][9][10]. The back-off efficiency of power amplifier can be improved using several techniques; among them, the Doherty technique is the easiest, where no digital signal process (DSP) nor additional complex circuity is required.…”

Section: Introductionmentioning

confidence: 99%

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Three-Way Doherty Power Amplifier Using Class-F Amplifier for More Efficient Mobile Communications

Abdulkhaleq¹,

Yahya²,

Sajedin³

et al. 2020

Proceedings of the Proceedings of the 1st International Multi-Disciplinary Conference Theme: Sustainable Development and Smart

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An efficient three-way Doherty amplifier is designed and simulated using Cadence Microwave Office software. 6W, 25W and 45W GaN HEMT transistors are used to design three-way Doherty amplifier at 3.4-3.8 GHz band to achieve a 76W peak power. Each amplifier was designed to work as a class F amplifier to improve the efficiency of the designed amplifier. In addition, A new configuration of impedance modulation is used, where a 12.5 dB gain was obtained over the band, in addition, a 13 dB back-off efficiency was achieved with 50-60% drain efficiency. Changing the location of the peaking amplifier or changing the operation sequence of the peaking amplifier can achieve good efficiency at the back-off region. There was an efficiency improvement of 10% at the back off by utilizing a class F amplifier comparing with the classical Doherty design.

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Section: Theory Of Class F Amplifiermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three-Way Doherty Power Amplifier Using Class-F Amplifier for More Efficient Mobile Communications

Abdulkhaleq¹,

Yahya²,

Sajedin³

et al. 2020

Proceedings of the Proceedings of the 1st International Multi-Disciplinary Conference Theme: Sustainable Development and Smart

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“…Only 6-dB a peak efficiency at the back-off can be obtained from classical Doherty design assuming both amplifiers have same capabilities. To get more efficiency at further back-off of Doherty power, two different capabilities of power transistors of can be used to design asymmetrical Doherty amplifier to accomplish a higher back-off [13][14][15][16]. Another way to increase the back-off efficiency operating region is to utilise more parallel transistors connected via more than one quarter-wavelength line as demonstrated figure 3.…”

Section: Three-way Design Of Doherty Amplifiermentioning

confidence: 99%

Mutual Coupling Effect on Classical Three-way Doherty Amplifier for 5G Applications

Abdulkhaleq¹,

Hameed²,

Yahya³

et al. 2020

Proceedings of the Proceedings of the 1st International Multi-Disciplinary Conference Theme: Sustainable Development and Smart

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A three-way Doherty power amplifier targeting sub 6-GHz. Three 6W GaN transistors are used to design an 18W peak power with an 8.5 dB back-off efficiency. The amplifier achieved an efficiency of 55%, 63% and 80% at 8.5, 6, and 0 dB respectively from the peak power. The designed amplifier target 3.4-3.8 GHz band with a gain of 13 dB over the band. In addition, the amplifier was examined for different VSWRs taking into account the effect of impedance changing of antenna due to beamforming. There was an average of 3.35 dBm variation in the output power and 20% efficiency variation for different VSWRs at both the back-off and peaking regions. The structure of three-way Doherty amplifier or sequence of turning the peaking amplifiers on affects the amplifier performance for different VSWRs.

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“…Green communication goals include studying sustainability related to environmental conditions and energy efficiency to create a more harmonious industrial environment. Therefore, reducing energy usage is considered one of the critical problems of the base station infrastructures used for telecommunication networks [1,2]. The power amplifier (PA) is the most crucial module in the transmitter chain, so the development of power-efficient and wideband power amplifiers minimises the complexity of the hardware and helps meet the requirements of wireless applications.…”

Section: Introductionmentioning

confidence: 99%

Design of an efficiency enhanced wideband Doherty power amplifier based on synthesising of a modified harmonic‐control load modulation network

Abounemra,

Helaoui,

Ghannouchi

2024

IET Microwaves Antenna & Prop

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A design of a broadband Doherty power amplifier (DPA) using a novel harmonic control network (HCN) is presented. The DPA structure focused on manipulating harmonic components using this new HCN to enhance the bandwidth of operation and power efficiency. The proposed HCN combines a third harmonic suppression network (THSN) with the second harmonic impedance inverter circuit (SHIIC). In the design, the second harmonic component of the main transistor and the peaking transistor are short‐circuited by their associated SHIIC. Additionally, the carefully designed SHIIC and THSN circuit placed between the main and peaking transistors realise open circuit conditions at the third harmonic for both transistors at the saturation state and back‐off regions. Side by side with the aid of the properly designed post‐matching tuned network (PMTN), these harmonic loading conditions make both amplifiers to operate in continuous Class‐F modes with enhanced‐added efficiencies over wideband conditions. As a result, a succession of highly efficient DPA modes can be formed over a continuous frequency range in the full Doherty region, resulting in a reduced‐size enhanced power efficiency wideband DPA. For verification, a wideband DPA operating from 1.1 to 1.8 GHz was designed and implemented using the proposed topology. The measured drain efficiency of the implemented DPA at 6‐dB back‐off is 52.5%–67.5%, while the saturated power across the specified bandwidth is 43–43.7 dBm. The fabricated DPA exhibits an average efficiency of 48.7%–59.4%, when supplied by a 40‐MHz long‐term evolution (LTE) signal with a 7.5‐dB peak‐to‐average power ratio (PAPR). Performing digital pre‐distortion (DPD) improves the adjacent channel power ratio (ACLR) from −25.8 dBc to −47.6 dBc.

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Mutual Coupling Effect on Three-Way Doherty Amplifier for Green Compact Mobile Communications

Cited by 8 publications

References 8 publications

Three-Way Doherty Power Amplifier Using Class-F Amplifier for More Efficient Mobile Communications

Three-Way Doherty Power Amplifier Using Class-F Amplifier for More Efficient Mobile Communications

Mutual Coupling Effect on Classical Three-way Doherty Amplifier for 5G Applications

Design of an efficiency enhanced wideband Doherty power amplifier based on synthesising of a modified harmonic‐control load modulation network

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