Employing inverse Class‐E power amplifier series output filter in parallel Doherty power amplifier

In this paper, a Doherty power amplifier based on an inverse Class‐E amplifier with a series output filter are presented. The proposed inverse Class‐E amplifier has been designed and simulated using lumped elements and transmission lines (TL), respectively. The high‐performance simulation results of TL inverse Class‐E PA with an output power of 46.2 dBm, peak drain efficiency of 71%, and a power gain of 27 dB at an input power 18 dBm have been obtained. Finally, the Doherty power amplifier (DPA) based on the inverse Class‐E power amplifier with some asymmetry in two paths has been designed and implemented. Implementation of both carrier and peaking amplifiers with an inverse Class‐E load network can provide an increase in the efficiency and improvement of harmonic suppression levels. Maximum drain efficiencies of 69.3% and 54% at maximum output power level (50 dBm) and 7‐dB back‐off power level (43 dBm) have been measured, respectively.