Investigation of Input–Output Waveform Engineered Continuous Inverse Class F Power Amplifiers

Dhar, Sagar K.; Sharma, Tushar; Darraji, Ramzi; Holmes, Damon G.; Illath, Suhas Veetil; Mallette, Vince; Ghannouchi, Fadhel M.

doi:10.1109/tmtt.2019.2923187

Cited by 55 publications

(27 citation statements)

References 39 publications

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“…2. Harmonic impedances are assumed to be ideal as in the class-B PAs in the following analyses [29]- [31]. Here, conventional impedance conversion networks and impedance matching networks are replaced by a single two-section coupler whose terminal impedances are modified.…”

Section: Analysis Of the Proposed Quadband Dpamentioning

confidence: 99%

Design of a Quadband Doherty Power Amplifier With Large Power Back-Off Range

Zhang

Fusco

Cheng

et al. 2021

IEEE Trans. Circuits Syst. I

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This paper proposes a technique which allows quadband impedance matching and impedance level shifting Doherty power amplifier (DPA) design. By using novel coupler networks with reactance and choosing appropriate complex load impedances, the quadband DPA can reach a power back-off range (OBO) of over 9 dB. In addition, the peak PA branch and the carrier PA branch use different coupler network parameters in order to satisfy different impedance requirements. To illustrate the design procedure a quadband DPA with 9 dB OBO operating in 0.5-0.7 GHz, 1.5-1.7 GHz, 2.5-2.7 GHz, and 3.5-3.7 GHz frequency ranges is designed, fabricated and tested. Measurements demonstrate that the DPA can deliver saturated output power between 43.1 dBm and 43.8 dBm in all four bands, with a drain efficiency ranging from 63.3% to 66.5%. Also, drain efficiency of from 42.2% to 52.3 % can be obtained at an OBO of 9 dB level. The DPA implemented here shows state-of-the-art performance for OBO under quad-band operation.

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Section: Analysis Of the Proposed Quadband Dpamentioning

confidence: 99%

Design of a Quadband Doherty Power Amplifier With Large Power Back-Off Range

Zhang

Fusco

Cheng

et al. 2021

IEEE Trans. Circuits Syst. I

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show abstract

“…Traditionally, new variables can be introduced to the waveform expressions to enrich the load impedance solution space by increasing the design flexibility. [3][4][5] For example, continuous class-F/inverse class-F 4,[6][7][8] , class-J PAs, 9,10 class-B/J, 11 and even resistive harmonic impedances. 12,13 With mathematic equations, there are always some high-efficiency operation modes that cannot be defined.…”

Section: Introductionmentioning

confidence: 99%

A design of 1 to 4 GHz broadband high‐efficiency power amplifier with two‐way concurrent active load modulation method

You

Peng

et al. 2021

Int J RF Microw Comput Aided Eng

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Active load modulation and harmonic injection can be used to boost the power amplifier's (PA) efficiency, but these techniques must add a fundamental external source or a harmonic generator. In this paper, a two-way power amplifier architecture is introduced to extend high-efficiency operation bandwidth by utilizing concurrent active load modulation with a waveform mapping method. Active load modulation is realized in between the two branches with the aid of independent input amplitude and phase control. Based on a calculated waveform database, high-efficiency operations for both transistors from 1 to 4 GHz are designed in a self-defined optimization platform considering waveform distance and input parameters. Finally, this PA is fabricated and measured to offer 41.6 to 45.0 dBm power, 8.2 to 11.7 dB gain, and 56% to 89% drain efficiency from 0.85 to 3.85 GHz.

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“…So we believe that this simplified analysis method can reflect part of the characteristics of the power amplifier. This type of analysis method has also been used in the related research on the control of input harmonics and output harmonics 24,25,29,30 . Therefore, the theoretical derivation part of this paper continues to use this simplified analysis method.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the input nonlinearity and its impact on waveform shaping are ignored in much previous research. Although some studies of input waveform shaping are investigated in References [21][22][23][24][25], the influence on source harmonic's impact can be further explored and analyzed.…”

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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Investigation of Input–Output Waveform Engineered Continuous Inverse Class F Power Amplifiers

Cited by 55 publications

References 39 publications

Design of a Quadband Doherty Power Amplifier With Large Power Back-Off Range

Design of a Quadband Doherty Power Amplifier With Large Power Back-Off Range

A design of 1 to 4 GHz broadband high‐efficiency power amplifier with two‐way concurrent active load modulation method

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

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