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 |
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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: | 18 Nov 2024 15:00 |
URI: | https://orca.cardiff.ac.uk/id/eprint/161787 |
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