Frequency-Agile Class-J Power Amplifier With Clockwise Fundamental- and Second-Harmonic Loads

Chang, Hsiu-Chen; Roblin, Patrick; Hahn, Yunsik; Martinez-Lopez, Jose I.; Liang, Chenyu; Rawat, Karun

doi:10.1109/tmtt.2020.2995216

Cited by 15 publications

(8 citation statements)

References 34 publications

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“…The second-harmonic signal is injected through the embedded broadband bandpass filter at the gate of the packaged transistor to further enhance the efficiency via the tuning of the intrinsic output loadlines of the transistor. The effectiveness of the CW and modulated active second-harmonic injection methodology presented in this paper are validated by the improvements in the efficiency experimentally reported in [3]. At 2 GHz, it can be observed that the drain efficiency improves by 15% for CW signals and 9.7% for a frequency-modulated 30 MHz chirp signal.…”

Section: Discussionsupporting

confidence: 57%

“…The experimental results are presented in this section. The frequency-agile broadband clockwise-loaded class-J PA circuit and measurement setup were reported in [3]. The fabricated CLCJ PA is shown in Figure 4.…”

Section: Experimental Validation Using Cw and Modulated Signalsmentioning

confidence: 99%

“…For radar applications, high-efficiency broadband PAs are needed. Waveform-engineering based continuous mode PAs, such as class J [1,2], clockwise-loaded class-J (CLCJ) [3], continuous class F [4,5], and class F −1 [6,7], have been studied extensively for broadening the operating bandwidth. The majority of continuous mode research focused more on the waveform engineering at the drain current source reference plane (CSRF).…”

Section: Introductionmentioning

confidence: 99%

“…As reported in [3], the transistor gate bias is set at −3 V with a frequency-agile drain supply voltage ranging from 23 to 31.6 V.…”

mentioning

confidence: 99%

“…Figure 2 shows the simulated drain-efficiency source-pull Γ S (2ω) contours for ω/(2π) at 1.9, 2.0, and 2.1 GHz using the output matching network designed in [3]. The areas with different colors represent different drain efficiencies.…”

mentioning

confidence: 99%

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CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers

et al. 2021

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The second-harmonic input impedance plays a critical role on the performance of GaN power amplifiers. In a recent paper, a drain efficiency enhancement for a continuous-mode power amplifiers was reported to be achieved using active broadband second-harmonic injection at the PA input. In this paper, the strategy for selecting the second-harmonic input impedance and the necessity for using active injection in such broadband PAs are discussed in detail. Additionally, the methodology for designing an embedded broadband diplexer in the input matching network is reported. Finally, the importance of the phase of the second-harmonic signal injected is demonstrated for both CW and modulated signals using both simulation and measurement, respectively. The effectiveness of the CW and modulated active second-harmonic injection methodology presented here are validated by previously reported measurements that demonstrated an average drain efficiency improvement of 9.4% from 1.3 to 2.4 GHz for CW signals and of 9.7% at 2 GHz for a frequency-modulated 30 MHz chirp radar signal.

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Section: Discussionsupporting

confidence: 57%

Section: Experimental Validation Using Cw and Modulated Signalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…As reported in [3], the transistor gate bias is set at −3 V with a frequency-agile drain supply voltage ranging from 23 to 31.6 V.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers

et al. 2021

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Broadband high‐efficiency power amplifier with compact coupling matching network

Wang

Zhang

et al. 2021

Micro & Optical Tech Letters

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This article presents the design of a broadband highefficiency power amplifier (PA) with a compact coupling structure. In theory, the output matching network impedance expression based on the compact coupling structure is derived. According to the load impedance range of the class EFJ PA, the coupling structure is deduced to meet the impedance range of the class EFJ PA. This structure can realize the two functions of impedance transformation and harmonic impedance control. In order to further expand the bandwidth and improve the drain efficiency, the step impedance matching method is used to design the input matching network. To verify this design approach, a broadband high-efficiency PA over a 115% bandwidth from 0.8 to 3.0 GHz is designed. The measured results show that the PA delivers output power of 40-42.2 dBm with the drain efficiency of 62%-73% and gain of 10-12.2 dB in the target band. The test results are good consistent with the simulated ones.

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An octave bandwidth Class-J power amplifier with second harmonic termination control

Bukvic

Ilić

2023

AEU - International Journal of Electronics and Communications

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Frequency-Agile Class-J Power Amplifier With Clockwise Fundamental- and Second-Harmonic Loads

Cited by 15 publications

References 34 publications

CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers

CW and Modulated Input Second Harmonic Injection for Efficiency Enhancement in Broadband Power Amplifiers

Broadband high‐efficiency power amplifier with compact coupling matching network

An octave bandwidth Class-J power amplifier with second harmonic termination control

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