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The Doherty power amplifier is competing with class-AB amplifiers in mobile base-stations, thanks to its superior performances in terms of back-off efficiency. However, in case of microwave backhaul applications, where higher center frequencies and wider bandwidths are needed, it is still not clear if the linearity-efficiency trade-off is in favour of the DPA or of the classical class-AB. In this...
A 7 GHz GaN MMIC Doherty power amplifier with reconfigurable input network for backhaul applications, is presented. The reconfigurable solution is conceived to be simply implemented in MMIC technologies. To demonstrate the effectiveness of the strategy, a second Doherty with fixed input network, has been designed for comparison. Both prototypes have been realized adopting a commercial GaN HEMT process...
In this paper, two 5W power amplifier solutions for microwave backhaul at 7GHz are presented. They are based on 0.25μm GaN on SiC MMIC technology, and rely on advanced Doherty schemes. The first solution maximizes the back-off efficiency at center frequency, reaching a value around 50% at 7dB OBO. The second MMIC is optimized for a wideband behavior, with efficiency exceeding 40% on a 15% relative...
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