Output signal re-injection in load modulated balanced amplifiers for RF bandwidth improvement

Yuan, Tonghui, Quaglia, Roberto ORCID: https://orcid.org/0000-0003-3228-301X, Chaudhry, Kauser, Azad, Ehsan, Powell, Jeff R. and Cripps, Steve C. ORCID: https://orcid.org/0000-0002-2258-951X 2023. Output signal re-injection in load modulated balanced amplifiers for RF bandwidth improvement. IEEE Microwave and Wireless Components Letters 33 (10) , pp. 1458-1461. 10.1109/LMWT.2023.3305812

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Abstract

This letter discusses the theory, simulation, and experimental characterization of a load-modulated balanced amplifier (LMBA) where the control signal power (CSP) is obtained by re-injecting part of the output RF signal. Compared to the standard balanced load-modulated power amplifier (PA), this approach does not require an external amplification of the CSP. The potential of this technique is explored experimentally with a balanced PA (BPA) working on 1400-3400-MHz band, using an external off-the-shelf directional coupler and manual phase shift adjustment. The induced load modulation can lead to a 10% increase of power added efficiency, or 1 dB of output power, across the frequency band of operation compared to the BPA.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Engineering
Publisher:	Institute of Electrical and Electronics Engineers
ISSN:	1531-1309
Date of First Compliant Deposit:	15 August 2023
Date of Acceptance:	12 August 2023
Last Modified:	18 Nov 2024 15:00
URI:	https://orca.cardiff.ac.uk/id/eprint/161787

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