The Continuous Harmonic-Tuned Power Amplifier

Merrick, Brian M.; King, Justin; Brazil, T.J.

doi:10.1109/lmwc.2015.2479850

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…The Z 2 L does not have to be shorted strictly. And due to factorial factor

((), 1 - δ \sin θ)

added into the output voltage formula, the square output voltage waveform for hybrid continuous class‐F voltage 38–40 can be given as

\begin{matrix} lefttrue \\ V_{italicds} (λ, μ, δ, θ) = (1 - λ \cos θ + μ \cos 3 θ) (1 - δ \sin θ) \\ = 1 - λ \cos θ - δ \sin θ + \frac{λ + μ}{2} \cdot δ \sin 2 θ \\ + μ \cos 3 θ - \frac{1}{2} μδ \sin 4 θ, (- 1 < δ < 1) \end{matrix}

…”

Section: Drain Waveforms and Performance Evaluation Of Hybird Continu...mentioning

confidence: 99%

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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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“…The Z 2 L does not have to be shorted strictly. And due to factorial factor

((), 1 - δ \sin θ)

added into the output voltage formula, the square output voltage waveform for hybrid continuous class‐F voltage 38–40 can be given as

\begin{matrix} lefttrue \\ V_{italicds} (λ, μ, δ, θ) = (1 - λ \cos θ + μ \cos 3 θ) (1 - δ \sin θ) \\ = 1 - λ \cos θ - δ \sin θ + \frac{λ + μ}{2} \cdot δ \sin 2 θ \\ + μ \cos 3 θ - \frac{1}{2} μδ \sin 4 θ, (- 1 < δ < 1) \end{matrix}

…”

Section: Drain Waveforms and Performance Evaluation Of Hybird Continu...mentioning

confidence: 99%

“…The Z 2L does not have to be shorted strictly. And due to factorial factor 1 À δsinθ ð Þadded into the output voltage formula, the square output voltage waveform for hybrid continuous class-F voltage [38][39][40] can be given as…”

Section: Formulation Of Voltage and Current Waveformsmentioning

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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“…By studying the field of designing PAs, in retrospect, it can be understood several different PA design methods are introduced to increase PAs' PAE, bandwidth, to name but a handful. Such methods comprise envelope tracking [1][2][3][4][5], switching mode class PAs [6][7][8][9][10], harmonically tuned class PAs [10][11][12][13][14][15], Cherix outphasing [16][17][18][19][20], and DPA [21][22][23][24][25]. DPA is one such PA that is still under more scrutiny to subdue the related restrictions of exerted technology and try to reach the best possible performance of that PA [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Extended Bandwidth and Increased Efficiency Quasi-Doherty Power Amplifier Design With A Revised Approach For Load Modulation

Rouhani

Rouhi

Abrishamifar

et al. 2021

Preprint

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This paper presents an approach to power added efficiency (PAE) increase for Quasi-Doherty power amplifier (Q-DPA) design. For this aim, active feedback is utilized instead of a passive quarter wavelength transmission line (TL) usage, which is conventionally used in the DPA schematic. PAE increase can be done by applying an accurate load modulation to the main amplifier (PAmain), especially for technologies in which output impedance of the main power amplifier (Zout,main) considerably varies in both low and high power regions. Because such precise modulation is still based on a modified TL, this approach suffers from the inherent narrowband behavior of that TL. As a consequence, expecting a wideband DPA may not be satisfied in all cases. To deal with this issue, active feedback is used to play a role in reaching PAmain, which is not saturated before, to its maximum efficiency at the highest level of received input power (Pin) in the high power region. Following Zout,main trajectories in power and frequency sweeps simultaneously just by a passive TL are not needed anymore. Still, for the sake of preventing total PAE degradation due to the consummated power by the feedback path’s power amplifier (PAfeedback) should be limited, analytical confinement is provided in this work. A comparison is made between GaAs pHEMT 0.25um MMIC technology-based conventional DPA and the proposed revised approach based-DPA to verify the mentioned approach. The proposed PA shows maximum output power of 33.4 dBm, maximum PAE of 41.6, fractional bandwidth of 11%. The Q-DPA works with a maximum power gain of 24.16.

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“…A recent and important discovery in PA design has been continuous modes [3], which have enabled the combination of harmonic tuning and broadband operation. Originally introduced as an extension of class B for purely reactive second harmonic terminations, it has now been applied to many different PA classes and cases [4], [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Power and efficiency continuous modes in saturated GaN HEMT devices

Bogusz

Costello

Quaglia

et al. 2018

2018 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC)

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This paper discusses, for the first time, the continuity of optimum load for power and efficiency in saturated GaN devices. Continuous modes are defined originally on the zerograzing voltage assumption. In this paper we show that a continuous behaviour can also be observed in saturated devices without imposing any limitation on clipping. Simulations using a simplified knee-model for the device and source-load pull experimental characterization are critically analysed and compared to describe the discovered continuum.

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The Continuous Harmonic-Tuned Power Amplifier

Cited by 10 publications

References 7 publications

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

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

Extended Bandwidth and Increased Efficiency Quasi-Doherty Power Amplifier Design With A Revised Approach For Load Modulation

Power and efficiency continuous modes in saturated GaN HEMT devices

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