The Effects of Limited Drain Current and On Resistance on the Performance of an LDMOS Inverse Class-E Power Amplifier

You, Fei; He, Songbai; Tang, Xiaohong; Deng, Xiangke

doi:10.1109/tmtt.2008.2011175

Cited by 12 publications

(2 citation statements)

References 16 publications

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“…High‐efficiency power amplifiers (PAs) are based on envelope elimination and restoration (EER) transmitters and linear amplification with nonlinear components (LINC) at the intermediate stages of RF and microwave systems. Different configurations of PAs were found to have high efficiency 1–14 . The Class‐E amplifier has the potential in portable wireless communication systems owing to its 100% efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…The inverse Class‐E at suboptimum condition at any duty ratio has been studied by Chen and He 6 . The on‐resistance effects on the performance of the inverse Class‐E mode using a simplified transistor model were analyzed by Fei You et al 7 In Mury and Fusco, 8 the effect of the duty cycle on the performance of the inverse Class‐E amplifier has been presented. Moreover, one of the high‐efficiency PAs in the communication system is the DPA.…”

Section: Introductionmentioning

confidence: 99%

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Employing inverse Class‐E power amplifier series output filter in parallel Doherty power amplifier

Sheikhi

Hemesi

Grebennikov³

2022

Micro & Optical Tech Letters

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In this paper, a Doherty power amplifier based on an inverse Class-E amplifier with a series output filter are presented. The proposed inverse Class-E amplifier has been designed and simulated using lumped elements and transmission lines (TL), respectively. The high-performance simulation results of TL inverse Class-E PA with an output power of 46.2 dBm, peak drain efficiency of 71%, and a power gain of 27 dB at an input power 18 dBm have been obtained. Finally, the Doherty power amplifier (DPA) based on the inverse Class-E power amplifier with some asymmetry in two paths has been designed and implemented. Implementation of both carrier and peaking amplifiers with an inverse Class-E load network can provide an increase in the efficiency and improvement of harmonic suppression levels. Maximum drain efficiencies of 69.3% and 54% at maximum output power level (50 dBm) and 7-dB back-off power level (43 dBm) have been measured, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Employing inverse Class‐E power amplifier series output filter in parallel Doherty power amplifier

Sheikhi

Hemesi

Grebennikov³

2022

Micro & Optical Tech Letters

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Inverse Class‐E power amplifier with broadband capability at different switch‐off duty ratio

Sheikhi,

Hemesi,

Grebennikov

2024

Circuit Theory & Apps

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The paper explores the investigation of an inverse Class‐E amplifier featuring a series output filter across various switch‐off duty ratios D. Analysis of different duty ratios as a design parameter reveals their impact on peak switch voltage, output power capability, and maximum operating frequency. Notably, it is demonstrated that adjusting the D ratio affects these parameters, with specific emphasis on achieving a maximum normalized switch voltage lower than 2 and an output power capability exceeding 0.1 for D = 0.7. Furthermore, the paper considers both parasitic shunt capacitance and series inductor in the load network, a departure from previous works that solely focused on the series inductor. The proposed circuit is highlighted for its ease of implementation compared with conventional reactance compensation circuits employing parallel resonant circuits, which are challenging to form directly. An innovative approach is introduced to showcase the broadband performance of the inverse Class‐E amplifier. The measured drain efficiency and output power versus input power at 430 MHz are 82% and 45.3 dBm, respectively. A similar performance can be achieved within the frequency range of 380–600 MHz by proper tuning at saturated power. The measurement results demonstrate a maximum high power‐added efficiency (PAE) of 79% and drain efficiency of 82% within this frequency range, accompanied by a gain exceeding 12.0 dB and output power surpassing 44 dBm.

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Extended theoretical analysis method on the performance of high-efficiency power amplifiers by solving nonlinear waveform determination process

You

Huang

2016

Int J RF Microw Comput Aided Eng

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Classical analysis of high‐efficiency power amplifiers (PA) is usually based on ideal voltage and current waveforms limited to optimal states. A transistor's nonlinear I‐V curves are not usually taken into consideration because of their complexity. With a computer‐aided calculation tool developed herein, a direct waveform determination method involving nonlinear I‐V curves is realized. Using this approach and simplified I‐V curves, a PA's extended theoretical performance from the back‐off region to saturation can be investigated. If using practical dc I‐V curves, this method can also give good performance analysis results even at microwave frequency. Numerical examples of different PA settings are given to verify this method. Nonlinear calculations, harmonic balance simulations, and measurements of a class‐E PA operating at 3 GHz are shown with consistent results to prove this waveform determination method.

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The Effects of Limited Drain Current and On Resistance on the Performance of an LDMOS Inverse Class-E Power Amplifier

Cited by 12 publications

References 16 publications

Employing inverse Class‐E power amplifier series output filter in parallel Doherty power amplifier

Employing inverse Class‐E power amplifier series output filter in parallel Doherty power amplifier

Inverse Class‐E power amplifier with broadband capability at different switch‐off duty ratio

Extended theoretical analysis method on the performance of high-efficiency power amplifiers by solving nonlinear waveform determination process

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