High-efficiency harmonic-control amplifier

Ingruber, B.; Pritzl, W.; Smely, D.; Wachutka, M.; Magerl, Gottfried

doi:10.1109/22.681213

Cited by 36 publications

(3 citation statements)

References 11 publications

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“…To achieve the broadband and high efficiency of the PAs, various impedance matching techniques are proposed, but unfortunately, it is difficult to maintain a high efficiency level over a bandwidth above octave. Generally, the high‐efficiency PAs are normally achieved by using harmonic‐tuned mode topologies, such as Class‐F 7,8 and inverse Class‐F 9 . To realize high‐efficiency, a complex load network is demanded to achieve infinite harmonic terminations, resulting in bandwidth restrictions for the PAs.…”

Section: Introductionmentioning

confidence: 99%

Design of multioctave power amplifier using multi‐harmonic bilateral pull technique

Xuan

Wang

Zhao

et al. 2020

Micro & Optical Tech Letters

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In this letter, the design, implementation and measurements of a multioctave bandwidth high-efficiency GaN HEMT power amplifier (PA) based on a novel systematic design methodology are presented. To achieve bandwidth expansion while maintaining a high level of efficiency, the multi-harmonic bilateral pull technique has been employed to acquire the optimum fundamental and second harmonic impedance regions. Especially, the impedance region of the second harmonic is analyzed to conclude that the second harmonic impedance can be expanded to a resistive-reactive with complex load impedances. Therefore, multioctave bandwidth can be achieved by combining low-pass lumped circuit (LC) matching network. For experimental verification, the wideband PA is achieved with a 10-W GaN device. The measurement results manifest that the implemented PA has a drain efficiency (DE) of 54% to 71% and a saturated output power of 38.2 to 42.3 dBm for the entire intended frequency range between 0.5 to 3.1 GHz with a relative bandwidth of 144.4%, while providing a gain larger than 8.2 dB. Measurement results confirm the theoretical findings.

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Section: Introductionmentioning

confidence: 99%

Design of multioctave power amplifier using multi‐harmonic bilateral pull technique

Xuan

Wang

Zhao

et al. 2020

Micro & Optical Tech Letters

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“…Switched-mode power amplifiers (SMPA) as e.g., class-F [18][19][20], inverse class-F [21][22][23] or current mode class-D (CMCD) provide the potential to increase the efficiency considerably. Due to the switched-mode operation the active devices are operated as switches instead of current sources, and therefore the drain voltages and drain currents ideally never occur simultaneously, which increases the electrical efficiency theoretically to 100%.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient switched-mode transmitter using a current mode class-D RF amplifier

Schuberth

Singerl

Gadringer

et al. 2010

Int J RF and Microwave Comp Aid Eng

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This article presents a switched-mode transmitter architecture using a current mode class-D (CMCD) amplifier. To achieve high average efficiency for a modulated signal the envelope of the complex baseband signal is transformed into pulses such that the CMCD amplifier is operated either at its peak efficiency or completely switched off. The CMCD amplifier has been designed based on single-tone active harmonic load-pull measurements to achieve a power-added efficiency (PAE) of 61.5% with 25 W output power at 900 MHz using LDMOS FETs. Removing the losses of the demodulation filter and of the amplifier a 10% higher efficiency than in an ideal class-B amplifier can be obtained for burst-mode operation with a peak-to-average power ratio of 10 dB. V C 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE 20: 446-457, 2010.

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“…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. are proposed and good results have been achieved.…”

mentioning

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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High-efficiency harmonic-control amplifier

Cited by 36 publications

References 11 publications

Design of multioctave power amplifier using multi‐harmonic bilateral pull technique

Design of multioctave power amplifier using multi‐harmonic bilateral pull technique

Highly efficient switched-mode transmitter using a current mode class-D RF amplifier

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

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