A 700-2800MHz Switchless Class-G Power Amplifier with Two-Quadrant Modulation for Back-off Efficiency Improvement

In this paper, a novel Switchless class-G (SLCG) Power Amplifier (PA) is proposed to improve back-off efficiency by allowing transistors operate across the 1 ^st and 3 ^rd quadrants of the I-V curves. Based on the technique, a 700-2800MHz demonstration PA is developed using commercial GaN HEMTs, exhibiting 43dBm saturated power and 45-57.5% −6dB back-off efficiency. To the best of our knowledge, this is the state-of-the-art performance of multi-octave highly efficient PAs.