the graphical technique for nonlinear circuits was described that enable us to optimize circuits to obtain maximum output power, maximum efficiency or minimum intermodulation. according to this method a high power amplifier in the ka band was designed. using a nonlinear model of the transistor, optimum slope for load-line was determined so that maximum power at the output was obtainable, then ...

This paper presents a new methodology for designing broadband three-way Doherty power amplifier (DPA), which utilizes reactance compensation generated by parallel peaking amplifiers to extend the bandwidth and improve back-off efficiency. By analyzing load impedance efficiency of reactance-compensated DPA, optimal at output required extension can be obtained. Then, structure using two is propos...

This article presents a novel methodology for designing broadband Doherty power amplifier (DPA) with extended output back-off (OBO) range. A modified load modulation network (LMN) is proposed to enhance the OBO range and bandwidth of DPA simultaneously. Analysis conducted explore relationship between LMN parameters performance under various levels. Generalized design formulas are then introduce...

A Doherty power amplifier (DPA) is an effective structure born in 1936 which, after a scarce revival around year 2000), had been strengthened from 2005 because its capability to combine linear amplification with power efficiency. Despite the conceptual simplicity of its basic operation, a lot of practical drawbacks shrink the theoretical behavior, thus leading a significant number of research w...

Abstract To meet the requirements of 5G communication system, Doherty power amplifier has become a research hotspot because its peak-to-average ratio and high backoff efficiency. At same time, with continuous development mobile technology, traditional gradually been difficult to needs due structural problems. On one hand, limitation 1/4 wavelength transmission line in amplifier, it is achieve b...