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

Yuan, Tonghui, Quaglia, Roberto ORCID:, Chaudhry, Kauser, Azad, Ehsan, Powell, Jeff R. and Cripps, Steve C. ORCID: 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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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: 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: 11 Nov 2023 17:53

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