A 70% GaN doherty power amplifier

This paper discusses the design of wideband Doherty amplifier. Design strategy basically depends upon the elimination of bandwidth constraints in basic Doherty amplifier as pointed by the investigation, which are quarter wave impedance transformer and capacitance at the transistor output terminal. In this frame work, high efficiency can be achieved by designing wideband Doherty power amplifier which is realized by using wideband compensators along with second and third harmonics tuning and wideband branch line coupler at the output which replaces the quarter Impendence transformer. In this work Simulation results of the wideband band DPA, for the 3.1GHz to 3.75 GHz, gives the drain efficiency 70%-75% and power added efficiency 65% at about 46-43 dBm output power and gain around 12 dB in the desired band.