An Extended Topology of Parallel-Circuit Class-E Power Amplifier to Account for Larger Output Capacitances

Cumana, Jesus; Grebennikov, Andrei; Sun, Guolin; Kumar, Nagendra; Jansen, R.H.

doi:10.1109/tmtt.2011.2168971

Cited by 31 publications

(34 citation statements)

References 24 publications

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“…In [22,23] is shown the narrow frequency UHF band that demonstrated high efficiency employing switched gain stage and class E approaches, respectively with 7.2 V. Other recent works related to high performance power amplifier are reported in [24,25] with GaAs HBT and CMOS technology, respectively. In the other hands, power amplifier design with parallel-coupled transformer matching is demonstrated in [26,27].…”

Section: S-parametermentioning

confidence: 99%

Dual Fed Distributed Amplifier With Controlled Termination Adjustment

Kumar¹,

Limiti²,

Paoloni³

2013

PIER

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Abstract-A new circuit and technique to extend the bandwidth of the Dual Fed Distributed Amplifier (DFDA) while preserving the improvement on efficiency performance in comparison to conventional distributed amplifiers (DAs) is presented. The theoretical analysis is described in detail, and a test vehicle is realized to demonstrate the effectiveness of the proposed method. Output power of ∼ 29 dBm, gain of 10 dB, covering a bandwidth from 100 to 800 MHz, with a PAE of 20-45% is experimentally demonstrated. The results are compared with measured results of the conventional DA, demonstrating a significant improvement in bandwidth and efficiency.

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Section: S-parametermentioning

confidence: 99%

Dual Fed Distributed Amplifier With Controlled Termination Adjustment

Kumar¹,

Limiti²,

Paoloni³

2013

PIER

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“…In order to achieve the high efficiency of the class-E PA beyond f max , some methods have been proposed introducing an inductor to compensate the excessive capacitance reactance C ex [7,8,9,10]. However, the main focus of the most approaches is only to investigate how to compensate for C ex at a single frequency, such as the fundamental frequency [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, the open-circuit requirement at higher harmonics for optimum Class-E operation would be violated, which has a detrimental effect on the amplifier performance at high frequencies. To resolve this issue, some methods have been proposed to compensate the output capacitance at both the fundamental and harmonic frequencies [9,10]. However, the method in [9] has been restricted to only being used in low-frequency applications, due to large parasitic parameters at high frequencies and self-resonant frequency of the lumped components.…”

Section: Introductionmentioning

confidence: 99%

“…To resolve this issue, some methods have been proposed to compensate the output capacitance at both the fundamental and harmonic frequencies [9,10]. However, the method in [9] has been restricted to only being used in low-frequency applications, due to large parasitic parameters at high frequencies and self-resonant frequency of the lumped components. In [10], a transmission-line compensation circuit is proposed, which is more suitable for microwave band.…”

Section: Introductionmentioning

confidence: 99%

“…In the following, it is assumed that the output capacitance of the transistor C out is larger than the optimum value obtained from Eq. (3), i.e., C out ¼ Cð1 þ Þ, where ¼ C ex =C is defined as the excess factor [9,10]. When > 0, a different value of the feed inductor L new is required as depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-efficiency parallel-circuit class-E power amplifier with distributed T-shaped compensation circuit

Cheng

Zhu

et al. 2016

IEICE Electron. Express

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This article reports a modified parallel-circuit class-E power amplifier (PA) that maintains its operating conditions even when the output capacitance of the transistor is greater the optimum capacitance. The finite inductor in the parallel topology is replaced by an L-C T-shaped circuit to eliminate the limits on the maximum operating frequency. The L-C T-shaped circuit can be approximately transformed to the distributed for the microwave applications. The analysis is validated by simulation and measurement. The fabricated PA deliver a maximum drain efficiency of 77.5% with the maximum output power of 40.2 dBm at 2.9 GHz.

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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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An Extended Topology of Parallel-Circuit Class-E Power Amplifier to Account for Larger Output Capacitances

Cited by 31 publications

References 24 publications

Dual Fed Distributed Amplifier With Controlled Termination Adjustment

Dual Fed Distributed Amplifier With Controlled Termination Adjustment

High-efficiency parallel-circuit class-E power amplifier with distributed T-shaped compensation circuit

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

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