Understanding the 3 level Doherty

Roberts, Michael James

doi:10.1109/eumc.2016.7824604

Cited by 5 publications

(3 citation statements)

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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 can be used to design asymmetrical Doherty amplifier to accomplish a higher back-off [16,17]. Another way to increase the back-off efficiency operating region is by utilising more parallel transistors connected via more than one quarter-wavelength line as demonstrated figure 3.…”

Section: Three-way Doherty Amplifiermentioning

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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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: Three-way Doherty Amplifiermentioning

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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show abstract

“…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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“…This study requires additional signal processing circuits and fine control technique. To avoid these additional techniques, a three‐stage DPA using transistors of equal sizes for the main and peaking amplifiers was introduced . The relative level of current at each amplifier stage in the three‐stage DPA is 1:1:1.…”

Section: Introductionmentioning

confidence: 99%

A 55‐W high efficiency unbalanced three‐stage Doherty power amplifiers for various output power back‐offs

Kim

Kang

Kim

2018

Micro & Optical Tech Letters

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High efficiency unbalanced three‐stage Doherty power amplifiers (DPA) for input signals with various peak to average power ratios (PAPR) are presented. The amplifier uses three GaN devices of equal size. The output power back‐off (OPBO) at the efficiency peak of the amplifier can be extended and reduced according to the input signals with various PAPR. This is achieved by adjusting the impedances of the λ/4 impedance transformers at the individual amplifier output stages in the three‐stage DPA without the use of additional circuitries and by changing the impedance matching circuit at the input stages of the amplifiers. The current of the individual amplifiers in the three‐stage DPA is calculated according to the PAPR of the input signals. The impedances of the λ/4 impedance transformers are determined by the current ratio for the main, first peaking, and second peaking amplifiers and are implemented by microstrip lines. 55 W unbalanced three‐stage DPAs for extended and reduced OPBO are designed and fabricated to be operated at the frequency of 1810 MHz.

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Understanding the 3 level Doherty

Cited by 5 publications

References 0 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

A 55‐W high efficiency unbalanced three‐stage Doherty power amplifiers for various output power back‐offs

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