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A 1.8-3.2 GHz Doherty Power Amplifier in quasi-MMIC Technology

Quaglia, Roberto ORCID:, Greene, Mark D., Poulton, Matthew J. and Cripps, Steve C. ORCID: 2019. A 1.8-3.2 GHz Doherty Power Amplifier in quasi-MMIC Technology. IEEE Microwave and Wireless Components Letters 29 (5) , pp. 345-347. 10.1109/LMWC.2019.2904883

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This letter presents the design and characterization of a quasi-integrated Doherty power amplifier for base-station applications. The prototype is based on GaN on SiC 0.25-μm 50-V transistors, whereas the passive matching networks are realized on a GaAs substrate. The design, based on a dual-input Doherty architecture, achieves a continuous-wave (CW) output power higher than 42 dBm and a backoff efficiency higher than 38% over the 1.8-3.2-GHz frequency band. By using an off-chip coupler, a single-input operation is also possible with a slight reduction in performance, i.e., CW output power and backoff efficiency higher than 41.4 dBm and 36%, respectively, on the 1.8-3.2-GHz band. System-level characterization shows higher peak power achievable than in CW condition as well as the linearizability of the amplifier under modulated signal conditions.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Institution of Engineering and Technology
ISSN: 1531-1309
Date of First Compliant Deposit: 11 March 2019
Date of Acceptance: 7 March 2019
Last Modified: 07 Nov 2023 00:33

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