2.4 GHz Class- $\text{F}^{-1}$ GaN Doherty Amplifier With Efficiency Enhancement Technique

Kim, Joonhyung

doi:10.1109/lmwc.2017.2767292

Cited by 17 publications

(8 citation statements)

References 12 publications

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“…Power amplifier (PA) is one of the most important components in Radio Remote Unit (RRU), its performance strongly influence the whole system performance in terms of bandwidth, output power, and efficiency . The PA module contributes over 65% of the energy usage in RRU, to improve the efficiency of the PAs and meet the power consumption requirement of the system, several kinds of design method is proposed, such Class‐E, Class‐J, Class‐F, and Doherty . Although the working principle of those methods is difference, they all follow the same principles that minimum the output harmonic energy and the heat loss of transistor .…”

Section: Introductionmentioning

confidence: 99%

“…1,2 The PA module contributes over 65% of the energy usage in RRU, to improve the efficiency of the PAs and meet the power consumption requirement of the system, several kinds of design method is proposed, such Class-E, [3][4][5] Class-J, 6,7 Class-F, [8][9][10] and Doherty. 11,12 Although the working principle of those methods is difference, they all follow the same principles that minimum the output harmonic energy and the heat loss of transistor. 13 The theory of Class-E PA is constructing proper output network to decrease the power usage of the transistor and maximum the output power, in ideal states, the transistor is assumed to be an ideal switch, and the efficiency can up to 100%.…”

Section: Introductionmentioning

confidence: 99%

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1.6‐2.6 GHz continuous Class‐F power amplifier with gain and power‐added efficiency flatness enhancement by negative feedback structure

Luo

Feng

et al. 2019

Micro & Optical Tech Letters

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This article studies the feasibility of applying negative feedback structure in continuous Class‐F power amplifiers to improve the gain and efficiency flatness. The operation principle of the negative feedback structure under small and large signal input states is presented. The gain and efficiency are increased at high frequency part and decreased at low frequency by introducing the negative feedback structure, and the flatness is improved. Multiharmonic bilateral pull is used to obtain the optimum impedances, to reduce the interaction between source and load side, and the influence of parasitic parameters. A highly flatness amplifier with the negative feedback structure is designed operating at 1.6‐2.6 GHz by using a Cree GaN HEMT CGH40010H device. The measurement results show a gain flatness of 1.1 dB, and a power‐added efficiency flatness of 9%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

1.6‐2.6 GHz continuous Class‐F power amplifier with gain and power‐added efficiency flatness enhancement by negative feedback structure

Luo

Feng

et al. 2019

Micro & Optical Tech Letters

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“…With the development of wireless communication technology, the amount of data transmitted is greatly increasing. Therefore, high peak-to-average modulation signals are often used to improve data transmission capacity [1,2,3,4,5]. Traditional power amplifiers (PAs) often only maintain high efficiency at saturation, and are not suitable for amplifying the high peak-to-average ratio signals [6,7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…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. A broadband Doherty PA with a 41% fractional bandwidth is presented, in which the post-matching structure and low-order impedance transformation networks are employed to achieve the broadband performance [4].…”

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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“…Thus, the Doherty power amplifier (DPA) has been extensively used due to its simple implementation and significant efficiency enhancement [2,3,4,5,6,7,8,9]. To further improve the efficiency, the harmonic controlled DPAs based on class-F and class-J modes have been presented [10,11]. Due to the symmetric configuration, the back-off power (BOP) ranges of the conventional harmonic controlled DPAs are always limited to around 6 dB [12,13].…”

Section: Introductionmentioning

confidence: 99%

A harmonic controlled symmetric Doherty power amplifier with extended back-off power range

Xia

Zhu

Ding

et al. 2018

IEICE Electron. Express

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This paper proposes a harmonic controlled symmetric Doherty power amplifier (DPA) for large back-off applications. For efficiency enhancement, the harmonic impedances of the carrier and peaking amplifiers are controlled in the continuous class-F mode. To extend the back-off range, unlike the traditional DPA, the output impedance of the peaking amplifier locates far away from infinity at the edge of the Smith chart, which can further improve the efficiency of the carrier amplifier. For verification, a 3.3-3.8 GHz symmetric DPA was designed and measured. The designed DPA can deliver an efficiency of 45%-48% at 9 dB back-off power over the whole frequency band with a maximum output power larger than 44 dBm. When driven by a 40-MHz modulated signal, the DPA exhibits an adjacent channel leakage ratio of better than -50 dBc after linearization at an average output power of 36.5 dBm.

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2.4 GHz Class- $\text{F}^{-1}$ GaN Doherty Amplifier With Efficiency Enhancement Technique

Cited by 17 publications

References 12 publications

1.6‐2.6 GHz continuous Class‐F power amplifier with gain and power‐added efficiency flatness enhancement by negative feedback structure

1.6‐2.6 GHz continuous Class‐F power amplifier with gain and power‐added efficiency flatness enhancement by negative feedback structure

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

A harmonic controlled symmetric Doherty power amplifier with extended back-off power range

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