Design of a 12dB back-off asymmetric Doherty power amplifier using reactive output impedance

Xia, Jing; Zhang, Tianqi; Cai, Jialin; Zhou, Xinyu; Ding, Dawei; Kong, Wa; Bao, Xu

doi:10.1587/elex.17.20200156

Cited by 8 publications

(2 citation statements)

References 30 publications

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“…As wireless spectrum resources grow increasingly constrained, the continuous operational bandwidth in future mobile communication systems is often limited. As a result, the carrier aggregation technology is employed to aggregate discontinuous frequency bands over a broadband spectrum for high-speed data transmission, which requires the power amplifiers (PAs) [1,2,3,4] to be able to operate efficiently over a wider frequency range [5,6,7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Optimization design of fragment-type filtering matching network for continuous inverse class-F power amplifier

Xia

Bian

Kong

et al. 2022

IEICE Electron. Express

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This paper proposes a filtering matching network optimization design method using the fragment-type structure for continuous inverse class-F (CCF −1 ) power amplifier (PA). Different from the conventional microstrip matching structure, the fragment-type structure is used to increase the flexibility of optimization for a sharp roll-off at the second harmonic band. By using a multi-objective evolutionary algorithm, a filtering output matching network (OMN) with the fast transition between the passband and stopband is designed and optimized. For verification, a 1.5-3 GHz broadband CCF −1 PA is designed, simulated and measured. Simulated results show that, compared with conventional Chebyshev filtering OMN design, the operational bandwidth of the proposed design can be expanded by about 15%. Experimental results show that measured efficiency of 65%-77% with a corresponding output power of 40.2-42.2 dBm over a fractional bandwidth of 66.7% can be achieved.

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Section: Introductionmentioning

confidence: 99%

Optimization design of fragment-type filtering matching network for continuous inverse class-F power amplifier

Xia

Bian

Kong

et al. 2022

IEICE Electron. Express

Self Cite

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show abstract

“…To meet the needs of future wireless communication systems, the DPAs that can improve the efficiency and dynamic range of OPBO are important issues in the research community [8]- [15]. Among them, three-stage and three-way DPAs have garnered significant research attention [16]- [22], which can effectively amplify the signal at larger back-off power.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Extension of Three-Way Doherty Power Amplifier With Reactance Compensation Using Parallel Peaking Amplifiers

et al. 2021

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This paper presents a new methodology for designing a broadband three-way Doherty power amplifier (DPA), which utilizes a reactance compensation generated by parallel peaking amplifiers to extend the bandwidth and improve the back-off efficiency. By analyzing the load impedance and efficiency of the reactance-compensated DPA, the optimal reactance at the output of the peaking amplifier required for bandwidth extension can be obtained. Then, a structure using two parallel peaking amplifiers is proposed to reduce the output reactance for the desired distribution. Using a λ 0 /4 transmission line, a sufficiently large output reactance of the peaking branch can be realized at the combining point over a wider frequency band, which can compensate the effective load impedance of the carrier amplifier and improve its efficiency and bandwidth. A wideband three-way DPA is designed and fabricated to verify the proposed method. Measurement results indicate that an efficiency of 50-53% at 10 dB output power backoff and a saturated efficiency of 54-68% can be achieved over the frequency range from 1.6 to 2.7 GHz.

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A Broadband Doherty Power Amplifier for Sub-6GHz 5G Applications

et al. 2023

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This paper presents a novel and accurate procedure for designing a Doherty power amplifier (DPA) for wireless systems. The method is based on a systematic approach to designing the matching networks of both Main and Auxiliary devices, which employs an optimization process to set their input impedance in the corresponding optimal regions obtained from standard load-and source-pull simulations. To import the optimum regions of each device into the optimization algorithm, mathematical expressions are derived and graphically reported on the Smith chart. Besides this, we have developed an accurate method to account for the loading effect of the Auxiliary amplifier on the Main one at back-off when designing the Main PA. As a proof of concept, a symmetric DPA is designed, fabricated, and tested. The measurements showed a working frequency band of 3.3 -3.9 GHz (aimed at n78 band of 5G-NR), a minimum peak output power of 36 W, drain efficiency between 48 % -53.2 % at peak and 34.6 % -44.5 % at 6 dB back-off.INDEX TERMS Doherty power amplifier, high-efficiency power amplifier, load-pull, optimization, sourcepull, wideband matching network.

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Design of a 12dB back-off asymmetric Doherty power amplifier using reactive output impedance

Cited by 8 publications

References 30 publications

Optimization design of fragment-type filtering matching network for continuous inverse class-F power amplifier

Optimization design of fragment-type filtering matching network for continuous inverse class-F power amplifier

Bandwidth Extension of Three-Way Doherty Power Amplifier With Reactance Compensation Using Parallel Peaking Amplifiers

A Broadband Doherty Power Amplifier for Sub-6GHz 5G Applications

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