A Digitally Assisted Dual-Input Dual-Band Doherty Power Amplifier With Enhanced Efficiency and Linearity

Kalyan, Robin; Rawat, Karun; Koul, Shiban K.

doi:10.1109/tcsii.2018.2859370

Cited by 23 publications

(16 citation statements)

References 13 publications

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“…A recent work using digital dual-input power was done by [55] targeting a dual-band Doherty power amplifier, where the difference of the reactance impedance that the transistor needs to see at the input side for both bands is eliminated by using a short-circuited shunt stub. Moreover, the load modulation of the designed circuit was improved by using different drain voltages, where 22 V and 36 V were used for both the main and the auxiliary amplifier, the difference in drain voltages helped the main amplifier to be more efficient at the back-off and more current to be got from the auxiliary amplifier, where the load modulation can be improved.…”

Section: Dual-band Design Improvementsmentioning

confidence: 99%

Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

Abdulkhaleq

Yahya

McEwan³

et al. 2019

Electronics

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Power amplifiers in modern and future communications should be able to handle different modulation standards at different frequency bands, and in addition, to be compatible with the previous generations. This paper reviews the recent design techniques that have been used to operate dual-band amplifiers and in particular the Doherty amplifiers. Special attention is focused on the design methodologies used for power splitters, phase compensation networks, impedance inverter networks and impedance transformer networks of such power amplifier. The most important materials of the dual-band Doherty amplifier are highlighted and surveyed. The main problems and challenges covering dual-band design concepts are presented and discussed. In addition, improvement techniques to enhance such operations are also exploited. The study shows that the transistor parasitic has a great impact in the design of a dual-band amplifier, and reduction of the transforming ratio of the inverter simplifies the dual-band design. The offset line can be functionally replaced by a Π-network in dual-band design rather than T-network.

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Section: Dual-band Design Improvementsmentioning

confidence: 99%

Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

Abdulkhaleq

Yahya

McEwan³

et al. 2019

Electronics

View full text Add to dashboard Cite

show abstract

“…On the other hand, the traditional single-frequency communication system has been unable to meet the current complex communication needs. Therefore, dual-band (DB) or multiband DPA has become a research hotspot because of its ability to enhance the efficiency during OPBO [13,14,15,16,17,18,19,20]. In the past years, the research on this has achieved great developments [21,22,23,24,25,26,27,28,29].…”

Section: Introductionmentioning

confidence: 99%

A concurrent 2.6/3.5GHz dual-band Doherty power amplifier with matching network based on composite right/left-handed unit cell

Luo

Xuan

Wang

et al. 2022

IEICE Electron. Express

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This paper presents a dual-band matching network based on composite right/left-handed transmission line (CRLH-TL) unit cell to optimize the impedance matching of dual-band Doherty power amplifier (DPA). The number of CRLH unit cells in the matching network can be flexibly determined by theoretical calculation to achieve impedance matching at any two frequencies. Moreover, A dualband DPA is designed and fabricated using GaN HEMT CGH40010H to verify the performance of the proposed network. The designed DPA can deliver a saturation output power over 43.3 dBm and the drain efficiency (DE) over 55.2% in the frequencies of 2.6 GHz and 3.5 GHz. Meantime, the drain efficiency at the 5dB output power back-off (OPBO) is over 44% at 2.6 GHz and 3.5 GHz.

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“…This does not mean that single-input Doherty PAs with good bandwidth do not exist, see for example [ 13 , 14 ]. However, the additional degrees of freedom offered by the separate inputs can be used to optimise the performance on the same or larger bandwidth, or to improve other performance metrics such as linearity and average efficiency [ 15 , 16 ]. Similar considerations can be made for the LMBA, which was originally proposed for telecom applications as a dual-input structure [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Machine-Learning Assisted Optimisation of Free-Parameters of a Dual-Input Power Amplifier for Wideband Applications

Wang

Quaglia

et al. 2021

Sensors

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This paper presents an auto-tuning approach for dual-input power amplifiers using a combination of global optimisation search algorithms and adaptive linearisation in the optimisation of a multiple-input power amplifier. The objective is to exploit the extra degrees of freedom provided by dual-input topologies to enhance the power efficiency figures along wide signal bandwidths and high peak-to-average power ratio values, while being compliant with the linearity requirements. By using heuristic search global optimisation algorithms, such as the simulated annealing or the adaptive Lipschitz Optimisation, it is possible to find the best parameter configuration for PA biasing, signal calibration, and digital predistortion linearisation to help mitigating the inherent trade-off between linearity and power efficiency. Experimental results using a load-modulated balanced amplifier as device-under-test showed that after properly tuning the selected free-parameters it was possible to maximise the power efficiency when considering long-term evolution signals with different bandwidths. For example, a carrier aggregated a long-term evolution signal with up to 200 MHz instantaneous bandwidth and a peak-to-average power ratio greater than 10 dB, and was amplified with a mean output power around 33 dBm and 22.2% of mean power efficiency while meeting the in-band (error vector magnitude lower than 1%) and out-of-band (adjacent channel leakage ratio lower than −45 dBc) linearity requirements.

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A Digitally Assisted Dual-Input Dual-Band Doherty Power Amplifier With Enhanced Efficiency and Linearity

Cited by 23 publications

References 13 publications

Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

A concurrent 2.6/3.5GHz dual-band Doherty power amplifier with matching network based on composite right/left-handed unit cell

Machine-Learning Assisted Optimisation of Free-Parameters of a Dual-Input Power Amplifier for Wideband Applications

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