Amplifier Linearization by using Parallel Coupled Stepped-Impedance Resonator Filter in the Linearization Circuit

In this paper, the impact of a real parallel coupled stepped-impedance resonator filter in the linearization circuit on a single stage broadband power amplifier is considered. The amplifier operates at 3.5 GHz central frequency and its linearization is performed in simulation by the digital technique that utilizes the baseband nonlinear signals of the second-order which modulate the signal carrier second harmonic. Results gained in the linearization process were analysed for 5G signal FBMC modulation form with 50 MHz useful bandwidth channel for several signal output power levels. The output spectrum achieved by using the parallel coupled stepped-impedance resonator filter in the linearization circuit is compared to the case when the linearization circuit contains an ideal filter.