The Resistive-Reactive Class-J Power Amplifier Mode

Friesicke, Christian; Quay, R.; Jacob, Arne F.

doi:10.1109/lmwc.2015.2463211

Cited by 50 publications

(36 citation statements)

References 4 publications

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“…2 illustrates the harmonic impedance spaces when α = 1, α = 9/8 and α = 2/ √ 3. The fundamental impedance spaces of SCMs are further enlarged compared to the Class-B/J and Class-F continuums when δ changed from 0 to 0.3 [6], [7]. From Fig.…”

Section: B Resistive-reactive Series Of Continuous Modesmentioning

confidence: 97%

“…Fig. 1(a) is the voltage of resistive-reactive Class-B/J continuum [7], and Fig. 1(d) is the voltage of resistive-reactive Class-F continuum [6].…”

Section: B Resistive-reactive Series Of Continuous Modesmentioning

confidence: 99%

“…However, the strict demands of harmonic loads were relaxed by introducing resistive second harmonic loads to the continuous Class-F and Class-B/J modes, recently [5]- [7]. This results in the working band of PAs can exceed an octave.…”

Section: Introductionmentioning

confidence: 99%

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Design of Broadband Power Amplifiers Based on Resistive-Reactive Series of Continuous Modes

Shi

et al. 2016

IEEE Microw. Wireless Compon. Lett.

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In this letter, the bandwidth of the series of continuous modes (SCMs) power amplifiers (PAs) is extended. The SCMs are composed of a series of continuous working modes between Class-B/J and Class-F continuums. The second harmonic load of the series of continuums is purely reactive. By introducing resistive part to the purely reactive second harmonic load of the series of continuous modes, the operation bandwidth of power amplifiers is expanded. A broadband PA working across 0.8-3.05 GHz (117% bandwidth) is simulated and fabricated. Experimental results show that the drain efficiencies in interesting band are 57.4%-79%. The fabricated PA can deliver output power of 10.1-20.7 W.Index Terms-Broadband, high-efficiency, power amplifier, resistive-reactive, series of continuous modes.

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Section: B Resistive-reactive Series Of Continuous Modesmentioning

confidence: 97%

“…Fig. 1(a) is the voltage of resistive-reactive Class-B/J continuum [7], and Fig. 1(d) is the voltage of resistive-reactive Class-F continuum [6].…”

Section: B Resistive-reactive Series Of Continuous Modesmentioning

confidence: 99%

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Design of Broadband Power Amplifiers Based on Resistive-Reactive Series of Continuous Modes

Shi

et al. 2016

IEEE Microw. Wireless Compon. Lett.

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“…However, later higher requirements are put forward for the design space of the PA due to the total bandwidth of evolving communication standards covers a wide bandwidth of more than one octave. To fulfill the above requirements, the extended continuous Class‐B/J mode is subsequently proposed . By further extending the drain voltage and current equation on the basis of continuous Class‐B/J mode, the design space of harmonic impedance is enlarged to include the real part, which enormously expands the bandwidth of continuous Class‐B/J PAs and maintain a high efficiency level simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Design of multioctave high‐efficiency power amplifier based on extended continuous Class‐B/J modes

Xuan

Yang

Liu

2019

Int J RF Microw Comput Aided Eng

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The bandwidth covered by contemporary communication technologies has reached over an octave. But most existing power amplifier (PA) configurations cannot meet this requirement while at the same time maintaining a high efficiency. Therefore, a novel structure for bandwidth enhancement at a high efficiency level is proposed together with the systematic design methodology in this article. The difficulty lies in the overlap of the fundamental and harmonic frequencies. On this issue, the extended continuous Class‐B/J mode can extend the impedance of the second harmonic to a resistive‐reactive and relax design requirements for overlapping design space of fundamental and second harmonic frequencies. Specifically, the presented innovative circuit structure uses the multiple frequencies matching method to manipulate four fundamental and the corresponding second harmonics frequency points simultaneously, which can further effectively expand the bandwidth on the basis of the extended continuous Class‐B/J PA. To verify the validity of the proposed theory, a gallium nitride multioctave PA is designed, implemented, and measured. Measured results show a fractional bandwidth of 148.4% from 0.4 to 2.7 GHz, with drain efficiency of 63%‐78%, saturated output power greater than 39 dBm, and large signal gain larger than 9 dB. For the single carrier WCDMA signal with a channel bandwidth of 3.84 MHz and a peak to average power ratio of 6 dB, the adjacent channel power ratio of −47.5 to −35 dBc and −42.8 to −31.5 dBc at an average output power of 33 and 36 dBm separately are achieved over the whole frequency band.

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“…However, the matching network, combined with the parasitics, can not keep the real part of fundamental impedance constant over a desired bandwidth. Therefore, other PA modes [5,6] based on Class-J or continuous Class-F are proposed to extend the design space of fundamental and second harmonics, and also the bandwidth.…”

Section: Introductionmentioning

confidence: 99%

<i>C</i>-band general Class-J power amplifier using GaN HEMT

Huang

et al. 2016

IEICE Electron. Express

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In this paper, a C-band wideband power amplifier (PA) using a GaN HEMT is proposed. The general Class-J mode, which offer a bigger design space for the fundamental and harmonic terminations, is introduced to implement wideband PA. Then, to verify the mechanism mentioned above, a wideband PA operating from 3.5 to 6.0 GHz is proposed and fabricated. Meanwhile, the load/source harmonic and baseband impedances are also considered for the linearity. The amplifier exhibits 8-11 dB gain and 51%-64% drain efficiency (DE) covering from 3.5 to 5.5 GHz.

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The Resistive-Reactive Class-J Power Amplifier Mode

Cited by 50 publications

References 4 publications

Design of Broadband Power Amplifiers Based on Resistive-Reactive Series of Continuous Modes

Design of Broadband Power Amplifiers Based on Resistive-Reactive Series of Continuous Modes

Design of multioctave high‐efficiency power amplifier based on extended continuous Class‐B/J modes

<i>C</i>-band general Class-J power amplifier using GaN HEMT

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