Bandwidth Extension of Doherty Power Amplifier Using Complex Combining Load With Noninfinity Peaking Impedance

Yang, Zhenxing; Yao, Yao; Li, Mingyu; Jin, Yi; Li, Tian; Dai, Zhijiang; Tang, Fang; Li, Zhengzhou

doi:10.1109/tmtt.2018.2884415

Cited by 56 publications

(28 citation statements)

References 29 publications

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“…Note, A z1,2 parameter remains at R opt in 7and (8) with the intention of increasing device reliability in the usage of the HTHCMs technique. Thus, on the condition that an inappropriate impedance match occurs, the alternative impedance match for the HTHCMs technique to fall on will be the A z1,2 parameter.…”

Section: Theory Of the Proposed Approachmentioning

confidence: 99%

“…Several techniques for adequately meeting the broadband and high back-off efficiency requirements in the Doherty power amplifier (DPA) are reported in the literature. Among these techniques are the bias modulation, envelope tracking [1], continuous mode [2] and many others [3][4][5][6][7][8]. Although the DPA's performance in [2] is encouraging, continuous mode analysis was not provided.…”

Section: Introductionmentioning

confidence: 99%

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Impacts of continuous modes approach on the back-off efficiency of Doherty power amplifiers

Naah

Shi

et al. 2019

Journal of Electromagnetic Waves and Applications

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This paper analyses the impacts of the harmonic-tuned hybrid continuous modes (HTHCMs) approach on the back-off efficiency of Doherty power amplifiers (DPAs). Based on the HTHCMs strategy, formulations are derived for designing the impedance inverting network (IIN) and impedance transforming network (ITN) in the DPA. Via the proposed approach, multiple impedance solutions for realizing broadband DPAs with substantial output back-off efficiency recovery is made possible. The potentiality of the design method is demonstrated by the realized prototype working from 1.4 to 2.45 GHz. Test results have shown over 50% drain efficiency at 6 dB back-off power.

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Section: Theory Of the Proposed Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impacts of continuous modes approach on the back-off efficiency of Doherty power amplifiers

Naah

Shi

et al. 2019

Journal of Electromagnetic Waves and Applications

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“…In the case of the continuous mode TW-SDPAs proposed by Chen et al [32][33][34] and Shi et al [35][36], the reported bandwidths are also less than 52% even if the beneficial effect of the continuous mode technique on the efficiency figure was tangible. Giofrè et al [40], Yang et al [42] and Rubio et al [43] proposed TW-SDPAs that were not accomplished using continuous mode technique. Upon comparing [40], [42] and [43] with [32][33][34][35][36], this is a clear indication that the reported continuous mode-based TW-SDPAs are critically facing bandwidth problems.…”

Section: Introductionmentioning

confidence: 99%

“…Giofrè et al [40], Yang et al [42] and Rubio et al [43] proposed TW-SDPAs that were not accomplished using continuous mode technique. Upon comparing [40], [42] and [43] with [32][33][34][35][36], this is a clear indication that the reported continuous mode-based TW-SDPAs are critically facing bandwidth problems. As a result, cannot meet the challenging demands and the successful deployment of modern wireless communication systems.…”

Section: Introductionmentioning

confidence: 99%

Empowering the Bandwidth of Continuous-Mode Symmetrical Doherty Amplifiers by Leveraging on Fuzzy Logic Techniques

Naah

Giofrè

2020

IEEE Trans. Microwave Theory Techn.

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Achieving a fractional bandwidth (FBW) of more than 60% has been a challenging problem for two-way symmetrical Doherty power amplifiers (TW-SDPAs) that are designed using continuous mode technique. As reported in the literature, these designed continuous mode-based TW-SDPAs possess less than 52% FBW which cannot satisfactorily meet the challenging, complex and ever-evolving modulation schemes' demands. To overcome such a limitation, this paper proposes a novel approach based on fuzzy logic techniques able to simplify and to speed up the design of continuous mode-based TW-SDPAs with state-ofart FBW. In particular, the proposed technique uses K-means unsupervised learning clustering algorithm and continuous mode technique in a modelled fuzzy logic system environment. As a result, extensive impedance solution design space is readily made available and the optimal impedances required by the carrier and peaking sub-amplifiers for efficiently operating at the saturation and output-power-back-off (OPBO) levels are automatically obtained. For verification, a TW-SDPA was designed and measured. According to the measured results, the TW-SDPA operates within 1.2−2.4 GHz frequency band, corresponding to 66.7% FBW. As compared to the designed continuous modebased TW-SDPAs reported in the literature, this work indicates over 15% increment in FBW. Moreover, 41.59%−81.1% drain efficiency (DE) at saturation, 35%−63% DE at 6 dB OPBO, 42−45 dBm output power and 7−10.52 dB gain were successfully achieved. Adjacent channel leakage ratio (ACLR) better than −46 dBc and average DE within 46%−55% were successfully recorded after linearisation.Index Terms-Continuous mode, Doherty power amplifiers (DPAs), fuzzy logic technique, fractional bandwidth (FBW).

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“…However, the bandwidth of Doherty PAs is limited by its offset lines [17,18,19,20]. Many methods have been reported to expand the bandwidth of the Doherty PAs [21,22,23,24]. In [3], a high efficiency Doherty PA which uses the complex combining load with non-infinity peaking impedance is implemented in 1.1-2.4 GHz.…”

Section: Introductionmentioning

confidence: 99%

A broadband Doherty power amplifier based on the two-port networks method

Zhang

Cheng

Zhang

et al. 2019

IEICE Electron. Express

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This paper proposes a simple method for designing a broadband Doherty power amplifier. The two-port network is used to represent the output matching networks and load modulation networks. Then, the relationships between the parameters of the two-port network and the output impedances of the transistors and the impedances of the power amplifier branches at the combiner are derived. The output matching network and the load modulation network are designed based on the parameters of the two-port network. A broadband Doherty power amplifier is designed and fabricated to verify the effectiveness of the proposed method. The measured results show that the saturated output power is 43.5-45 dBm and the saturated drain efficiency is 65-75% in 2.1-2.7 GHz. And the drain efficiency is greater than 40% at the 6 dB power backoff in the same frequency band. And the gain is above 12 dB.

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Bandwidth Extension of Doherty Power Amplifier Using Complex Combining Load With Noninfinity Peaking Impedance

Cited by 56 publications

References 29 publications

Impacts of continuous modes approach on the back-off efficiency of Doherty power amplifiers

Impacts of continuous modes approach on the back-off efficiency of Doherty power amplifiers

Empowering the Bandwidth of Continuous-Mode Symmetrical Doherty Amplifiers by Leveraging on Fuzzy Logic Techniques

A broadband Doherty power amplifier based on the two-port networks method

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