A Novel Formulation for High Efficiency Modes in Push-Pull Power Amplifiers Using Transmission Line Baluns

Smith, Robert Martin, Lees, Jonathan ORCID: https://orcid.org/0000-0002-6217-7552, Tasker, Paul J. ORCID: https://orcid.org/0000-0002-6760-7830, Benedikt, Johannes ORCID: https://orcid.org/0000-0002-9583-2349 and Cripps, Stephen Charles ORCID: https://orcid.org/0000-0002-2258-951X 2012. A Novel Formulation for High Efficiency Modes in Push-Pull Power Amplifiers Using Transmission Line Baluns. IEEE Microwave and Wireless Components Letters 22 (5) , pp. 257-259. 10.1109/LMWC.2012.2191273

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Abstract

Push-pull power amplifiers (PAs) operating at HF through to GHz frequencies typically employ a transmission line balun structure. This letter demonstrates that their performance characteristics in high efficiency PA applications are critically different from conventional transformers. For the first time, the effect of the even-mode open-circuit termination on the output waveforms is measured. A novel mathematical formulation is proposed to describe the time-domain waveforms by defining the harmonic impedance environment in terms of odd and even mode excitation rather than tuned harmonics. Experimental verification using harmonic load-pull measurements showed good agreement with the theoretical waveforms generated from factorized waveform expressions.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords:	Balun, high-efficiency, load-pull, microwave amplifiers, power amplifiers (PAs), push-pull
Publisher:	IEEE Microwave Theory and Techniques Society
ISSN:	1531-1309
Last Modified:	21 Oct 2022 09:24
URI:	https://orca.cardiff.ac.uk/id/eprint/36224

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