Dual input characterization of an asymmetric orthogonal load modulated balanced amplifier for enhanced linear performance

Urvoy, Jean-Baptiste, Ciutat, Angela, Quaglia, Roberto ORCID: https://orcid.org/0000-0003-3228-301X, Montoro, Gabriel and Gilabert, Pere L. 2026. Dual input characterization of an asymmetric orthogonal load modulated balanced amplifier for enhanced linear performance. Presented at: 2026 IEEE MTT-S Radio Frequency Technology and Techniques Symposium (IMS RFTT), Boston, MA, 07 - 12 June 2026. 2026 IEEE MTT-S Radio Frequency Technology and Techniques Symposium (IMS RFTT). IEEE, pp. 589-592. 10.1109/imsrftt43070.2026.11602430

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Abstract

This paper describes the characterisation of an asymmetric Orthogonal Load Modulated Balanced Amplifier (OLMBA) in Doherty-like operation. The OLMBA was characterized in both CW using a single input and with modulated signals as a dual-input power amplifier (PA). The simulations demonstrated that good efficiency could be achieved up to 10 dB Output Back-Off (OBO). However, the single-input CW measurements showed some significant performance degradation. The PA still maintained an efficiency of 35-57% over an OBO range of 6 to 10 dB. The PA was then tested with a modulated signal in a dual-input configuration that gives more flexibility and might overcome some of the discrepancies observed in the single-input configuration. After linearisation, the PA showed insensitivity to the crest factor applied (from 6 to 10 dB), maintaining the efficiency around 30 %, meaning that the asymmetric architecture worked well in expanding the OBO of the Doherty-like OLMBA.

Item Type:	Conference or Workshop Item - published (Paper)
Date Type:	Publication
Status:	Published
Schools:	Schools > Engineering
Publisher:	IEEE
ISBN:	9798331547660
Last Modified:	20 Jul 2026 11:01
URI:	https://orca.cardiff.ac.uk/id/eprint/188315

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