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

Abstract

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.

Optimizing Power Losses and Efficiency of Broadband Parallel-Circuit Class-E Power Amplifier

“…As one of the most widely used SMPAs in RF and microwave PA applications, Class-E PAs have attracted much attention in past decades [1,8,10,[20][21][22][23], which originate from the Class-D push-pull configuration and have exhibited simple topology, lower power consumption, and good harmonic suppression characteristics [24,25].…”

Historical Aspect of Load-Modulated Balanced Amplifiers

“…However, the wide use of high dynamic range signals at RF and especially mm-wave carrier frequencies complicates the design of power amplifiers. Different load-modulation architectures, including out-phasing [1], [2], dynamic load modulation power amplifier [3], [4], and DPAs [5], [6], have been employed because of the complexity and bandwidth limitation of envelope tracking, [2], [7], [8]. Applying switchingmode technique results in high efficiency power amplifiers, [9]- [11].…”