Microwave class-E power amplifiers

Popović, Zoya; Garcia, Jose

doi:10.1109/mwsym.2017.8058855

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…The second major solution is to obtain the fundamental output impedance through load-pull technique, while each harmonic is open through the L and C resonant circuits or microstrip lines, [14][15][16][17][18][19][20][21][22][23] as shown in 10. The advantage of this solution is that the fundamental impedance can be easily obtained without considering the harmonic impedance.…”

Section: Problem Of Class E Amplifiersmentioning

confidence: 99%

“…Secondly, there are various forms of matching networks for harmonic impedance open circuits. Previous studies 14,19,21 use

\frac{λ}{4}

transmission lines in input matching networks and output matching networks to obtain high output power and high efficiency 15,18 and adopt resonant circuit to provide the open condition at the second harmonic and the third harmonic.…”

Section: Introductionmentioning

confidence: 99%

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A new harmonic tuned class E power amplifier based on waveform analysis

Yang

Luo

Xuan

et al. 2022

Circuit Theory & Apps

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In this paper, a waveform theory for harmonic tuned class E power amplifier (HT class E PA) based on waveform analysis is proposed. This paper uses the waveform theory of class F PAs and class F−1 PAs to solve the problem of harmonic tuning of traditional class E PAs. The equation of normalized current waveform of the class E PA is analyzed, set the phase difference between the current and voltage of the harmonic components to π2, and finally deduced the equation of normalized voltage waveform. This paper replaces the output impedance in the traditional class E PA design with the output impedance obtained from the waveform analysis, which makes the design of the matching network more convenient and ensures that the output current waveform and voltage waveform of the designed new HT class E PA are very close to those of the ideal class E power amplifier. The theoretical efficiency of the new HT class E PA is 89.04%. Based on this theory, a power amplifier is designed using a CREE GaN CGH40010F transistor. Test results show that: the gain can reach 10.7 dB, the output power is 40.7 dBm, PAE is 67.7%, DE is 74%.

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Section: Problem Of Class E Amplifiersmentioning

confidence: 99%

“…Secondly, there are various forms of matching networks for harmonic impedance open circuits. Previous studies 14,19,21 use

\frac{λ}{4}

Section: Introductionmentioning

confidence: 99%

A new harmonic tuned class E power amplifier based on waveform analysis

Yang

Luo

Xuan

et al. 2022

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…class-E amplifiers [36] for the implementation of polar transmitters. A version with packaged devices from Cree, using PWM or on/off control for the coding of the envelope [19], is presented in Fig.…”

Section: Some Of These Gan Hemt Based Double Class-e Converters Have mentioning

confidence: 99%

Class-E Rectifiers and Power Converters: The Operation of the Class-E Topology as a Power Amplifier and a Rectifier with Very High Conversion Efficiencies

Garcia

Popović

2018

IEEE Microwave

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In the late 70's, the interest in reducing the value and size of reactive components moved power supply specialists to operate dc-to-dc converters at hundreds of kHz or even MHz frequencies. Passive energy storage (mainly magnetics) dominates the size of power electronics, limiting also its cost, reliability and dynamic response. Motivated by miniaturization and improved control bandwidth, they had to face the frequencydependent turn-on and turn-off losses associated with the use of rectangular waveforms in the hard-switched topologies of that time. Similar to approaches for RF/microwave power amplifiers (PAs), the introduction of resonant circuits allowed shaping either a sinusoidal voltage or current, with parasitic reactive elements absorbed by the topology in the neighborhood of the switching frequency. The resulting resonant power converters, obtained by cascading a dc-to-ac resonant inverter with a high-frequency acto-dc rectifier, first transform the dc input power into controlled ac power, and then convert it back into the desired dc output [1]. This paper provides some historic notes on the operation of the class-E topology, introduced worldwide to the RF/microwave community by Nathan O. Sokal [2], as a power inverter and as a rectifier, with very high conversion efficiencies up to microwave frequencies. Recent research advances and implementations of class-E rectifiers and dc-to-dc converters at UHF and beyond are included. Offering competitive performance in terms of efficiency for RF power recovery, together with a wide bandwidth for low-loss power conversion, their potential for some modern applications is highlighted.

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Non-ideal Continuous Class-E PA Modes for Maximum Efficiency and Maximum Linearity

Almeida

2020

2020 IEEE MTT-S International Wireless Symposium (IWS)

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Microwave class-E power amplifiers

Cited by 5 publications

References 25 publications

A new harmonic tuned class E power amplifier based on waveform analysis

A new harmonic tuned class E power amplifier based on waveform analysis

Class-E Rectifiers and Power Converters: The Operation of the Class-E Topology as a Power Amplifier and a Rectifier with Very High Conversion Efficiencies

Non-ideal Continuous Class-E PA Modes for Maximum Efficiency and Maximum Linearity

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