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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...
The paper shows the impact of a base-band predistortion linearization scheme of high efficiency power amplifiers (HPAs) in terms of key parameters such as the adjacent channel power ratio (ACPR) and the average PA efficiency. Two HPAs are compared: an uneven GaN Doherty (DPA) and a 2nd harmonic tuned Si LD-MOS (LPA). The base-band behavioral models of the HPAs are based on the parallel Hammerstein...
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