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

Carrubba, Vincenzo, Akmal, Muhammad, Quay, Rüdiger, Lees, Jonathan ORCID: https://orcid.org/0000-0002-6217-7552, Benedikt, Johannes ORCID: https://orcid.org/0000-0002-9583-2349, Cripps, Stephen Charles ORCID: https://orcid.org/0000-0002-2258-951X and Tasker, Paul J. ORCID: https://orcid.org/0000-0002-6760-7830 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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Abstract

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
URI:	https://orca.cardiff.ac.uk/id/eprint/36178

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