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Broadband GaN-Based Switch-Mode Core MMICs with 20 W Output Power Operating at UHF

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4 Author(s)
Maroldt, S. ; Fraunhofer Inst. for Appl. Solid State Phys., Freiburg, Germany ; Quay, R. ; Haupt, C. ; Ambacher, O.

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 three-stage 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.

Published in:

Compound Semiconductor Integrated Circuit Symposium (CSICS), 2011 IEEE

Date of Conference:

16-19 Oct. 2011