Design and characterization of an MMIC current mode outphasing power amplifier

Bogusz, Aleksander, Li, Wantao, Lees, Jonathan ORCID: https://orcid.org/0000-0002-6217-7552, Quaglia, Roberto ORCID: https://orcid.org/0000-0003-3228-301X, Montoro, Gabriel, Gilabert, Pere L. and Cripps, Steve ORCID: https://orcid.org/0000-0002-2258-951X 2024. Design and characterization of an MMIC current mode outphasing power amplifier. Presented at: IEEE/MTT-S International Microwave Symposium, Washington, DC, USA, 16-21 June 2024. Proceedings of IEEE/MTT-S International Microwave Symposium. IEEE, pp. 580-583. 10.1109/IMS40175.2024.10600335

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Abstract

This paper presents a power amplifier architecture based on outphasing. Both active devices are operated as current sources loaded by a single-ended load. The combination of phase and amplitude control allows for maintaining a constant voltage and, therefore, high efficiency on the devices' output. Output series compensation reactances reduce the imaginary part of the modulated load and improve efficiency. An integrated circuit prototype, fabricated using 0.25 μm GaN-on-SiC technology, whose size is 2.3 mm×2.8 mm , achieves a bandwidth of 1.6 GHz centred at 3.35 GHz, whereas the maximum CW output power remains within 43dBm±0.5dB . A total gain of more than 12 dB is reported from 2.95 to 3.95 GHz, while a maximum Power Added Efficiency (PAE) was measured as 68.5% at 3.25 GHz and remains greater than 60% from 2.85 to 3.8 GHz, and above 50% for almost the entire frequency range. The Output Back-Off (OBO) efficiency peaks at 3.25 GHz with 53.5% and 45.6% for 6 dB and 8 dB back-off, respectively, and remains above 30% and 23.7% for the entire frequency range. An ACPR performance of -45 dBc and -45.3 dBc was obtained for a 100 MHz 5G NR signal with 8 dB and 11 dB PAPR, respectively. The average output power was measured as 34.8 dBm and 29.4 dBm, while maintaining an average efficiency of 50.5% and 30.4%.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Publisher:	IEEE
ISBN:	9798350375053
ISSN:	2576-7216
Last Modified:	02 Sep 2024 11:20
URI:	https://orca.cardiff.ac.uk/id/eprint/171550

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