Outphasing Amplifier System Performance VS Large Frequency Band

This work presents an examination of the outphasing amplification system called also LINC (Linear amplification using non linear components) with two kinds of Wilkinson combiners, one is matched and the other one is unmatched. The Wilkinson combiner is called unmatched when the one hundred ohms resistor at its inputs is eliminated. The study is done with a frequency band from 1 GHz to 4 GHz to show the performance response of the two systems in function of the signal phase variation. In section two, the system with matched combiner is studied and we present some graphics done on ADS simulator. These graphics show clearly the combiner input impedances, the drain current the power efficiency and the signal linearity of the system in function of the phase variation for the entire frequency band. In section three the same simulation is done to show the same graphics, but the outphasing system is using this time an unmatched Wilkinson combiner. The comparison of the two system behaviors demonstrates that the linearity is conserved very well in both but for the power efficiency the unmatched combiner behaves better.