A 3.5GHz High Power GaN Hybrid Doherty Power Amplifier with Dynamic Input Power Splitting for Enhanced Power Added Efficiency at Backoff

Lopera, Jose Romero; Mayock, Jim; Sun, Qing; Gadringer, Michael Ernst; Bösch, Wolfgang; Leitgeb, Erich

doi:10.1109/pawr51852.2021.9375547

Cited by 17 publications

(5 citation statements)

References 4 publications

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“…According to the transformation of network parameters, the ABCD matrix in Equation ( 1) can be expressed by S parameters, and the S parameters of a lossless reciprocal two-port network can be expressed as. 29 CGH40010F is used to design the carrier amplifier by the large signal model. The drain voltage (Vdd) is 26 V, and the gate bias (Vgg) is À2.8 V. Active load pull technique is used to extract the optimal impedance of the triode at the peak output power point and power back-off point, respectively.…”

Section: Proposed Wideband Doherty Pamentioning

confidence: 99%

High‐efficiency wideband Doherty power amplifier based on two‐point impedance‐matching circuits

Song

Zhu

et al. 2022

Micro & Optical Tech Letters

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A novel wideband Doherty power amplifier with high-drain efficiency is proposed in this paper. The triode CGH40010F is adopted in carrier amplifier and peak amplifier to realize the power amplification, respectively. The wide bandwidth is achieved by using the two-point impedance matching circuit, which can be applied to achieve good matching of peak output power point and power back-off point at the same time. The drain efficiency at peak output power point is greater than 55.8% and the maximum drain efficiency is 71.3%, while the peak output power is greater than 43.2 dBm (with an error of AE0.7 dBm) from 1.8 to 2.8 GHz. The drain efficiency at 6 dB power back-off point is greater than 45.1% and the maximum drain efficiency is 63.2%.

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Section: Proposed Wideband Doherty Pamentioning

confidence: 99%

High‐efficiency wideband Doherty power amplifier based on two‐point impedance‐matching circuits

Song

Zhu

et al. 2022

Micro & Optical Tech Letters

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“…Previous studies indicate that DPAs have demonstrated impressive efficiency across a broad spectrum of output power levels. Past works used analog and digital control systems for regulating the inputs of the DPA where all the control components were fabricated on the same PCB, which restricts the use of the control system for the other amplifiers [14][15][16][17][18]. Moreover, previous approaches show that either the control system was integrated at the input of a power divider, which limits the control range for two parallel-connected PAs, or two different RF generators were used for the inputs of the parallel branch instead of using a power divider, increasing the chance of error for the mismatch between two signals.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Control System for the Independent Control of the Inputs of the Doherty Power Amplifier

Sah,

Poulton,

Luyen

et al. 2023

Designs

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This study presents a systematic design of an optimized drive signal control system for 2.5 GHz Doherty power amplifiers (DPAs). The designed system enables the analysis of the independent control of the amplitude and phase for the signals between the main and peak amplifiers of the DPA. The independent control of the signal is achieved by incorporating a variable attenuator (VA) and a variable phase shifter (VPS) in each of the two parallel paths of the DPA. This integration allows for driving varying power levels with an arbitrary phase difference between the individual parallel PAs for reduced control complexity and power consumption. The specific VA (Qorvo QPC6614) and VPS (Qorvo QPC2108) components are used for the test system to provide an amplitude attenuation range from 0.5 dB to 31.5 dB and a phase range from 0∘ to 360∘ at the intended operating frequency of 2.5 GHz, offering the benefit of characterizing the behavior of PAs for an extensive range of drive signals to optimize the output performance, such as PAE or the ACLR. For experimental validation, the designed drive signal control system is integrated with GaN PAs (Qorvo QPD0005—DUT) with a P1dB of 37.7 dBm. Each PA is preceded by a drive amplifier with a gain of 17.8 dB to boost the power fed into the PA. In this manuscript, we analyzed and compared the PAE of the DPA and parallel-connected PA for diverse input signals generated using a designed optimized control system.

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“…Due to the increasingly growing demand for wireless communication systems with high quality and high data rates, the radio frequency (RF) transceiver is being pushed to operate at higher frequencies and wider bandwidths, and with modulation schemes characterized by high Peak-to-Average Power Ratios (PAPRs). The power amplifier (PA) strongly affects the performance of the transmitter [1][2][3], and thus it should operate as efficiently as possible over wide bandwidths, maintaining a sufficient level of linearity, which is especially challenging for 5G systems, based on Orthogonal Frequency Division Modulation (OFDM). OFDM signals have a varying envelope and high PAPR of the order of 10 dB to 12 dB for aggregated multicarrier signals [4], thus making the design of a PA that operates efficiently over wide dynamic and frequency ranges a critical challenge [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Broadband Class-J GaN Doherty Power Amplifier

et al. 2022

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This paper presents a broadband 3 GHz–3.7 GHz class-J Doherty power amplifier exploiting second harmonic tuning in the output network. Furthermore, the output impedance inverter is eliminated and its effect is embedded in the main device’s output matching network, thus trading off among bandwidth, efficiency, and gain. The proposed amplifier adopts two 10 W packaged GaN transistors, and it achieves in measurement 60–74%, and 46–50% drain efficiency at saturation and 6 dB output back-off, respectively, with a saturated output power of 43 dBm–44.2 dBm and a small-signal gain of 10 dB–13 dB. The proposed DPA exhibits a simulated adjacent channel power ratio less than −30 dBc at 36 dBm average output power, when a 16-QAM modulation with 5 MHz bandwidth is applied to the 3.5 GHz carrier.

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A 3.5GHz High Power GaN Hybrid Doherty Power Amplifier with Dynamic Input Power Splitting for Enhanced Power Added Efficiency at Backoff

Cited by 17 publications

References 4 publications

High‐efficiency wideband Doherty power amplifier based on two‐point impedance‐matching circuits

High‐efficiency wideband Doherty power amplifier based on two‐point impedance‐matching circuits

An Optimized Control System for the Independent Control of the Inputs of the Doherty Power Amplifier

Broadband Class-J GaN Doherty Power Amplifier

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