Improvement of power added efficiency and linearity in Doherty amplifier using dual bias control and photonic band-gap structure

Abstract

The power added efficiency (PAE) and the linearity of the Doherty amplifier has been improved using the dual bias control and the photonic band gap (PBG) structure. The PBG structure has been used to implement on output matching circuit and the dual bias control has applied to improve the PAE of the Doherty amplifier at a low input level by applying it to a carrier amplifier. The Doherty amplifier using the proposed structure has been improved PAE by 6% and 4dBc of 3rd Inter-Modulation Distortion (IMD3) compared with those of the conventional Doherty amplifier, respectively. The designed the structure has consistently showed more than a 30% increase the PAE for over all input power level.