Abstract: This paper presents analysis of nonlinearity and its resulitedintermodulation(IM)effect of the amplifier of the satellite transponder.Polynomial approximation and Artificial Neural Network(ANN)simulationdata have been obtained from the singlecarrier power transfer curve of thetested amplifier.Comparisons have been made between the results,showingthat the nonlinearity analysis and simulation method presented in thisarticle using ANN concept is of theoretical importance and practical valueto the nonlinear problem resolution.