Modeling of Input Nonlinearity and Waveform Engineered High-Efficiency Class-F Power Amplifiers

Dhar, Sagar K.; Sharma, Tushar; Zhu, Ning Hua; Darraji, Ramzi; Holmes, Damon G.; Staudinger, Joseph; Helaoui, Mohamed; Mallette, Vince; Ghannouchi, Fadhel M.

doi:10.1109/tmtt.2020.3011442

Cited by 18 publications

(13 citation statements)

References 31 publications

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“…2(a) indicates the values of (𝛾, 𝜑 ) taken by simulating a nonlinear model of GaN transistor for second harmonic source reflection coefficient at the intrinsic gate of magnitude (|Γ |) fixed at 0.9 at 2.6 GHz to have a good correlation with practical implemented PAs. For a given device periphery, the ∠Γ can be evaluated as function of 𝛾, 𝜑 using nonlinear polynomial fitting of gate to source capacitance as given in [23]. Figure 2(b) illustrates the (𝛾, 𝜑 ) values realizable with respect to ∠Γ while keeping the |Γ2S| = 0.9.…”

Section: ) Drain Curret Modelingmentioning

confidence: 99%

“…Recently, comprehensive studies on input nonlinearity and its impact on PA performance have been investigated [19]- [26]. In [23], the input nonlinearity as a function of second harmonic source terminations is mathematically modeled and utilized to design efficiency enhanced broadband Class F/F -1 PA design [24], [25]. Also, input nonlinearity is considered in continuous mode Class B/J PA design in [26] but lacks the physical correlation to the input nonlinearity generation and source harmonic terminations.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Input-Output Waveform Engineered High-Efficiency Broadband Class B/J Power Amplifier

et al. 2022

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Section: ) Drain Curret Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Input-Output Waveform Engineered High-Efficiency Broadband Class B/J Power Amplifier

et al. 2022

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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.…”

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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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Class iCGF^–1 Mode Power Amplifier for Enhancing the Linearity of the Traditional Continuous Class F^–1 Mode

Li,

Yu,

Liu

2024

Circuit Theory & Apps

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In this paper, the iCGF−1 mode is proposed to compensate the amplitude‐to‐amplitude modulation (AM/AM) distortion of the traditional continuous class F−1 mode while maintaining the high efficiency. The AM/AM profile of the iCGF−1 mode is mathematically expressed simultaneously as a function of the input nonlinearity parameter and conduction angle , which makes the iCGF−1 mode more flexible in controlling the AM/AM profile. The first inflection point of the AM/AM profile can be moved to a higher output power level through theoretical deduction by adjusting the second harmonic source impedance and gate bias voltage to increase the values of and . This flattens the AM/AM profile while the efficiency profile remains almost the same as that of the traditional continuous class F−1 mode. The performance of the iCGF−1 mode is verified through simulation and experimental measurements. The iCGF−1 PA is fabricated with CGH40010F and has a frequency range of 2–2.6 GHz. The drain efficiency is 70.1%–77.9%, and the output power is 41.1–41.7 dBm. The linearity is tested with a 100 MHz 5G NR signal (the peak average power ratio (PAPR) is 8.5 dB) at 2.3 GHz. The worst adjacent channel power ratio (ACPR) is −32.3 dBc without digital predistortion (DPD) and −52.1 dBc with DPD. The results show that the iCGF−1 mode has successfully compensated the AM/AM distortion of the traditional continuous class F mode and maintaining high efficiency.

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Modeling of Input Nonlinearity and Waveform Engineered High-Efficiency Class-F Power Amplifiers

Cited by 18 publications

References 31 publications

Investigation of Input-Output Waveform Engineered High-Efficiency Broadband Class B/J Power Amplifier

Investigation of Input-Output Waveform Engineered High-Efficiency Broadband Class B/J Power Amplifier

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

Class iCGF^–1 Mode Power Amplifier for Enhancing the Linearity of the Traditional Continuous Class F^–1 Mode

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Modeling of Input Nonlinearity and Waveform Engineered High-Efficiency Class-F Power Amplifiers

Cited by 18 publications

References 31 publications

Investigation of Input-Output Waveform Engineered High-Efficiency Broadband Class B/J Power Amplifier

Investigation of Input-Output Waveform Engineered High-Efficiency Broadband Class B/J Power Amplifier

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

Class iCGF–1 Mode Power Amplifier for Enhancing the Linearity of the Traditional Continuous Class F–1 Mode

Contact Info

Product

Resources

About

Class iCGF^–1 Mode Power Amplifier for Enhancing the Linearity of the Traditional Continuous Class F^–1 Mode