USE OF VOLTERRA-SERIES IN OPTIMIZING HARMONIC LOAD IMPEDANCE FOR SUPPRESSING IM3 IN LTE InGaP HBT Power Amplifiers

摘要

The nonlinear distortion in InGaP/GaAs HBT power amplifiers for long-term evolution applications is analyzed using Volterra series. The interdependence between third-order Inter-modulation (IM3) and harmonic load impedance suggests an alternative technique to improve Pas' linearity. The measurement results show that IM3 is suppressed by more than 6 dB, whereas other performances are not affected.