This letter presents the design and characterization of an ultra-broadband GaN Doherty amplifier with more than an octave bandwidth. The developed architecture is based on ultra-wideband input/output splitting/combining networks capable to mitigate the typical frequency limiting factors of the traditional Doherty amplifier. The innovative design approach is demonstrated through a practical prototype realization based on commercial GaN-HEMT devices. From 1.05 to 2.55 GHz, continuous wave measurements have shown efficiency levels within 58% and 35% at 6 dB of output power back-off and within 83% and 45% at saturation, with an output power around 41 dBm. The performance of the prototype have also been evaluated by applying WiMAX and 3GPP modulated signals at different carrier frequencies, showing promising results.
Giofre', R., Piazzon, L., Colantonio, P., Giannini, F. (2014). An Ultra-Broadband GaN Doherty Amplifier with 83% of Fractional Bandwidth. IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, 24(11), 775-777 [10.1109/LMWC.2014.2345193].
An Ultra-Broadband GaN Doherty Amplifier with 83% of Fractional Bandwidth
GIOFRE', ROCCO;PIAZZON, LUCA;COLANTONIO, PAOLO;GIANNINI, FRANCO
2014-11-01
Abstract
This letter presents the design and characterization of an ultra-broadband GaN Doherty amplifier with more than an octave bandwidth. The developed architecture is based on ultra-wideband input/output splitting/combining networks capable to mitigate the typical frequency limiting factors of the traditional Doherty amplifier. The innovative design approach is demonstrated through a practical prototype realization based on commercial GaN-HEMT devices. From 1.05 to 2.55 GHz, continuous wave measurements have shown efficiency levels within 58% and 35% at 6 dB of output power back-off and within 83% and 45% at saturation, with an output power around 41 dBm. The performance of the prototype have also been evaluated by applying WiMAX and 3GPP modulated signals at different carrier frequencies, showing promising results.File | Dimensione | Formato | |
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