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The paper discusses the bandwidth extension of a second-harmonic tuned GaN Doherty power amplifier: the adopted strategy relies on output wideband compensation stages and input broadband matching. The single-band (3.5 GHz) and the wide-band (3–3.6 GHz) power amplifiers are compared in terms of building blocks design strategy. The performances, experimentally characterized in single- and two-tone conditions,...
This paper presents the design concept and experimental evaluation of a Doherty Power Amplifier for WiMAX applications at 3.5 GHz. The amplifier, exploiting a packaged GaN HEMT from Cree Inc., shows a saturated output power exceeding 43.5 dBm (22 W), a Doherty high efficiency region of 7 dB, with a first peak efficiency of 57% and maximum drain efficiency of 65 % at the amplifier saturation. The amplifier...
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