A 3-10 GHZ LCR-matched Power Amplifier using Flip-Chip Mounted AlGaN/GaN HEMTs

We report a GaN-based broadband power amplifier using AlGaN/GaN-HEMTs, grown on sapphire substrates, as the active devices. The circuit topology used novel LCRmatching networks in a 4-way binaryWilkinson combiner structure. The devices were flip-chip bonded onto the AlN circuit for thermal management. Using devices with 0.7-pm gate length and 4-mm gate width, a small-signal gain of 7 dB was obtained with 3-10 GHz bandwidth. The saturation power level was 8.5 W at 8 GHz, which is the highest for a power amplifier using GaNHEMTs-on-Sapphire.