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The Continuous Inverse Class-F Mode With Resistive Second-Harmonic Impedance

Carrubba, Vincenzo, Akmal, Muhammad, Quay, Rüdiger, Lees, Jonathan ORCID:, Benedikt, Johannes ORCID:, Cripps, Stephen Charles ORCID: and Tasker, Paul J. ORCID: 2012. The Continuous Inverse Class-F Mode With Resistive Second-Harmonic Impedance. IEEE Transactions on Microwave Theory and Techniques 60 (6) , pp. 1928-1936. 10.1109/TMTT.2012.2189228

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In this paper, an extended version of the continuous class-F-1 mode power amplifier (PA) design approach is presented. A new formulation describing the current waveform in terms of just two additional parameters, while maintaining a constant half-wave rectified sinusoidal voltage waveform, allows multiple solutions of fundamental and second-harmonic impedances that provide optimum performance to be computed. By varying only the imaginary parts of fundamental and second-harmonic impedances, it is shown that output performance in terms of power and efficiency is maintained constant and equal to that achievable from the standard class-F-1 . Indeed, when presenting resistive second-harmonic impedances, it will be demonstrated that the fundamental load can be adjusted to maintain satisfactory output performances greater than a certain predetermined target value. The measurements, conducted on a GaAs pHEMT device at 1 GHz, show a good agreement with the theoretical analysis, revealing drain efficiencies greater than 70% for a very large range of load solutions, which can translate to an ability to accommodate reactive impedance variations with frequency when designing broadband PAs.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords: Broadband amplifiers, microwave devices, microwave measurements, power amplifiers (PAs), radio frequency (RF)
Publisher: IEEE
ISSN: 0018-9480
Last Modified: 08 Dec 2022 10:37

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