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Broadband GaN-based switch-mode core MMICs with 20 W output power operating at UHF

: Maroldt, S.; Quay, R.; Haupt, C.; Ambacher, O.


IEEE Electron Devices Society; IEEE Solid-State Circuits Society; IEEE Microwave Theory and Techniques Society:
IEEE Compound Semiconductor Integrated Circuit Symposium, CSIC 2011 : 16-19 October 2011, Waikoloa, Hawaii
Piscataway/NJ: IEEE, 2011
ISBN: 978-1-61284-711-5 (Print)
ISBN: 978-1-61284-710-8 (Online)
ISBN: 978-1-61284-712-2
4 S.
Compound Semiconductor Integrated Circuit Symposium (CSICS) <33, 2011, Waikoloa/Hawai>
Fraunhofer IAF ()
gallium nitride; switch-mode; power amplifier; high efficiency; class-S

A high power broadband switch-mode core MMIC has been developed for an application in digital switch-mode power amplifiers, e.g., class-S, for mobile communications. The threestage design can be flexibly used at any frequency operating in UHF band up to a maximum digital bit rate of 3 Gbps, equal to a square wave frequency of 1.5 GHz. At 0.9 Gbps a maximum broadband output power of 20.5 W was measured at a drain efficiency of 76% and a power added efficiency of 70%. Controlled by a digital signal with a peak-to-peak amplitude of 3.5 V, a large signal gain of 25.3 dB was achieved.