Analysis of Class-E Based RF Power Amplifiers Using Harmonic Modeling

Sivakumar, S.; Eroğlu, Abdullah

doi:10.1109/tcsi.2009.2016169

Cited by 20 publications

(14 citation statements)

References 25 publications

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“…It can be observed that the results obtained by impedance method approach the fine PSpice result very well when . To involve 40 harmonics in the analysis seems a huge computational burden with some previous approaches [26]. Nevertheless, the iteration-free extended impedance method finishes this task in 3.7 ms.…”

Section: B Simulationmentioning

confidence: 99%

“…In our simulation program, . On the other hand, the admittance matrix of is (26) Similar tip is also applicable to the construction of impedance and admittance matrices for capacitances.…”

Section: Computational Issuesmentioning

confidence: 99%

“…In the studies on Class-E PAs, most of the frequency-domain analyses were based on the harmonic balance (HB) technique [24], [25]. Alternatively, Sivakumar and Eroglu performed the analysis with small number of harmonics by taking the time-domain boundary conditions as optimization objective under arbitrary loading and operation conditions [26]. Iterative procedures are required to carry out the steady-state analyses in [25], [26].…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, Sivakumar and Eroglu performed the analysis with small number of harmonics by taking the time-domain boundary conditions as optimization objective under arbitrary loading and operation conditions [26]. Iterative procedures are required to carry out the steady-state analyses in [25], [26]. For general resonant converter circuits, a technique called state-space averaging was discussed [22], [27], [28].…”

Section: Introductionmentioning

confidence: 99%

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Steady-State Simulation and Optimization of Class-E Power Amplifiers With Extended Impedance Method

Liang

Liao

2011

IEEE Trans. Circuits Syst. I

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This paper proposes a new iteration-free steady-state analysis to the Class-E power amplifier (PA) in frequency-domain by extending the scope of electrical impedance. Owning to this extension, the impedances of different circuit components in the Class-E PA circuits, including the active switches, can be expressed in matrix form. Based on the conventional circuit laws, e.g., the series and parallel laws and the Ohm's law, the steady-state characteristics of a whole Class-E PA circuit can be obtained by vector and matrix manipulation. The number of harmonics involved in the calculation have effects on the computational efficiency and accuracy. The influences of some circuit conditions towards the selection of harmonic number are discussed. The proposed formulation enables fast mapping of some performance indices, e.g., the output power and conversion efficiency, under steady state, so that the changing trends of these indices with respect to the variations of specified circuit parameters can be estimated. This feature can be utilized to carry out offline optimization by tuning some passive components, or online optimization by tuning two in situ adjustable parameters, i.e., the switch driving frequency and duty cycle. The later scheme provides preliminary knowledge on the in situ tuning of Class-E PA in the load varying applications, e.g., electric process heating and wireless power link.

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Section: B Simulationmentioning

confidence: 99%

“…In our simulation program, . On the other hand, the admittance matrix of is (26) Similar tip is also applicable to the construction of impedance and admittance matrices for capacitances.…”

Section: Computational Issuesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Steady-State Simulation and Optimization of Class-E Power Amplifiers With Extended Impedance Method

Liang

Liao

2011

IEEE Trans. Circuits Syst. I

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“…This has significant impact on the PA performance. The effect of the load variation on the class-E PA can be examined by an analytical approach [25] or using a load-pull technique [26].…”

Section: B Pvt Compensation Conceptmentioning

confidence: 99%

Process, Voltage and Temperature Compensation Technique for Cascode Modulated PAs

Sira

Larsen

2013

IEEE Trans. Circuits Syst. I

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This paper presents a process, voltage and temperature (PVT) compensation method for a cascode modulated polar power amplifier (PA). It is shown that it is possible to create a baseband replica circuit of the PA that has the same AM-AM nonlinearity as the PA itself. The replica circuit, that represents a transistor level model (empirical model) of the cascode modulated PA, is utilized in a PA analog predistorter. The analog predistorter linearizes and compensates for PVT variation of the cascode modulated PA. The empirical model is placed in the negative feedback of an operational transconductance amplifier. The predistorted varying envelope signal is applied to the cascode gate of the PA. It is shown that the proposed PVT compensation technique significantly reduces the PVT spread of the PA linearity indicators and improves the PA linearity. Simulations were performed in a 0.13 CMOS process.

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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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Analysis of Class-E Based RF Power Amplifiers Using Harmonic Modeling

Cited by 20 publications

References 25 publications

Steady-State Simulation and Optimization of Class-E Power Amplifiers With Extended Impedance Method

Steady-State Simulation and Optimization of Class-E Power Amplifiers With Extended Impedance Method

Process, Voltage and Temperature Compensation Technique for Cascode Modulated PAs

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

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