Reducing odd-order nonlinear distortions in a low noise amplifier

Abstract

The increase of transmitting devices around leads to the fact that increasing the dynamic range in receivers is becoming more and more important part of the development and design of receiving devices. The aim of the research is to study the possible methods of increasing the dynamic range of receiving devices, to carry out experiments and to evaluate the applicability of these methods. Methods to reduce nonlinear distortions in the receiving path that caused by the operation of a low-noise amplifier (LNA) in a nonlinear mode were investigated. Moreover, the method of modeling nonlinear systems with Volterra series was studied, as well as the application of Volterra series to model nonlinear systems with a polynomial model with memory for low-level signals was considered. Simulations of the receiving channel behavior was described by Volterra series that has been obtained in this work. During experiments with real signals, it was found that the nonlinear equalization effectively suppresses the nonlinear distortions of the LNA.