Progress In Electromagnetics Research C
ISSN: 1937-8718
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By S. Lin and A. E. Fathy

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A 50 to 550 MHz wideband gallium nitride (GaN) HEMT power amplifier with over 43 dBm output power and 63% drain efficiency has been successfully developed. The demonstrated wideband power amplifier utilizes two GaN HEMTs and operates in a push-pull voltage mode Class D (VMCD). The design is based on a large signal simulation to optimize the power amplifier's output power and efficiency. To assure a wideband operation, a coaxial line impedance transformer has been used as part of the input matching network; meanwhile, a wideband a 1:1 ferrite loaded balun and low pass filters are utilized on the amplifier's output side instead of the conventional serial harmonic termination.

S. Lin and A. E. Fathy, "Development of a wideband highly efficient GaN vmcd VHF/UHF power amplifier," Progress In Electromagnetics Research C, Vol. 19, 135-147, 2011.

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