Optimal Definition of Class F for Realistic Transistor Models

Martinez-Rodriguez, Francisco J.; Roblin, Patrick; Popović, Zoya; Martinez-Lopez, Jose I.

doi:10.1109/tmtt.2017.2743714

Cited by 14 publications

(3 citation statements)

References 19 publications

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“…High-efficiency power amplifiers (PAs) play a very important role in modern microwave and millimeter-wave systems. Among them, class-F and inverse class-F (F −1 ) PAs are intensively studied [1]- [10]. Previously, class-F −1 operation was strongly limited by the transistor breakdown voltage, because the maximum drain voltage of class-F −1 is 1.5 times larger than that of class-F operation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Efficiency-Limiting Factors Resulting from Transistor Current Source on Class-F and Inverse Class-F Power Amplifiers

Yamamoto

Kikuchi

Vadalà

et al. 2022

IEICE Trans. Electron.

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This paper describes the efficiency-limiting factors resulting from transistor current source in the case of class-F and inverse class-F (F −1 ) operations under saturated region. We investigated the influence of knee voltage and gate-voltage clipping behaviors on drain efficiency as limiting factors for the current source. Numerical analysis using a simplified transistor model was carried out. As a result, we have demonstrated that the limiting factor for class-F −1 operation is the gate-diode conduction rather than knee voltage. On the other hand, class-F PA is restricted by the knee voltage effects. Furthermore, nonlinear measurements carried out on a GaN HEMT validate our analytical results.

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Section: Introductionmentioning

confidence: 99%

Analysis of Efficiency-Limiting Factors Resulting from Transistor Current Source on Class-F and Inverse Class-F Power Amplifiers

Yamamoto

Kikuchi

Vadalà

et al. 2022

IEICE Trans. Electron.

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“…At present, how to further improve their efficiency and bandwidth is still concerned by researchers. For example, Class-F PAs are designed by using harmonic control methods to achieve higher efficiency in [2]- [5]. Reference [6] designs a high efficiency class-E PA by analyzing the DC I-V curve of the actual device.…”

Section: Introductionmentioning

confidence: 99%

Filtering Power Amplifier With Up to 4^th Harmonic Suppression

Xiao

2020

IEEE Access

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Unlike conventional conception that power amplifier and filter are regarded as two separate components and designed separately, this paper presents a high efficiency power amplifier with filtering capability, which is called filtering power amplifier. The proposed power amplifier integrates a bandpass filter as output matching network so that entire size is reduced to some extent. The filter will play the role of filtering and impedance matching simultaneously, and thus high-order harmonics are suppressed for output of the filtering power amplifier. For demonstration, an example of filtering power amplifier was designed, fabricated and measured. The measurement shows that it is featured by highly-selective bandpass response and good out-of-band performance. As high as 46.2 dB suppression can be achieved and extended over the forth-order harmonic. The example also retains the advantages of high efficiency and output power. The maximum output power can reach 40.5 dBm, and the maximum power-added efficiency is as high as 62%.

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“…In this regard, many researchers have achieved success. In order to achieve high efficiency, many technologies have been proposed, such as class-E, [4][5][6] class-F, [7][8][9] and harmonic control. [10][11][12] As for extending the bandwidth, continuous mode, [13][14][15] real-frequency technology, [16][17][18] post matching network, 19,20 etc.…”

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confidence: 99%

High‐efficiency hybrid continuous mode power amplifier with input and output harmonic engineering

Shen

Xiao

et al. 2021

Int J RF Mic Comp-Aid Eng

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This paper intensely studies the impact of the input nonlinearity caused by the transistor's feedback on the hybrid continuous class‐F power amplifier. The research extends the influence of input harmonics on class‐F power amplifiers to a more general form. Through waveform engineering, the impact of feedback is analyzed. By analyzing the change in cutoff angle caused by input nonlinearity, the change of the drain voltage and current waveforms of the hybrid continuous class‐F power amplifier can be obtained. The new drain voltage and current waveforms obtained from the analysis redefine the design space of source impedance and load impedance for the hybrid continuous class‐F power amplifier. By designing the corresponding input and output matching network, the second harmonic is suppressed, and finally, the hybrid continuous class‐F power amplifier achieves a high‐efficiency state. The research reveals that input harmonics also play an essential role in the design process of power amplifiers. A comparative experiment is designed to verify the theory. Simultaneously, a 1.6–2.8 GHz broadband hybrid continuous class‐F power amplifier is designed using this theory, with a saturation efficiency of more than 61.2% and a saturation power of more than 40.4 dBm.

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Optimal Definition of Class F for Realistic Transistor Models

Cited by 14 publications

References 19 publications

Analysis of Efficiency-Limiting Factors Resulting from Transistor Current Source on Class-F and Inverse Class-F Power Amplifiers

Analysis of Efficiency-Limiting Factors Resulting from Transistor Current Source on Class-F and Inverse Class-F Power Amplifiers

Filtering Power Amplifier With Up to 4^th Harmonic Suppression

High‐efficiency hybrid continuous mode power amplifier with input and output harmonic engineering

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Optimal Definition of Class F for Realistic Transistor Models

Cited by 14 publications

References 19 publications

Analysis of Efficiency-Limiting Factors Resulting from Transistor Current Source on Class-F and Inverse Class-F Power Amplifiers

Analysis of Efficiency-Limiting Factors Resulting from Transistor Current Source on Class-F and Inverse Class-F Power Amplifiers

Filtering Power Amplifier With Up to 4th Harmonic Suppression

High‐efficiency hybrid continuous mode power amplifier with input and output harmonic engineering

Contact Info

Product

Resources

About

Filtering Power Amplifier With Up to 4^th Harmonic Suppression