Measuring static nonlinearities systems has been a hot topic in recent years. In this thesis, amplifier is a device as a static nonlinearities system. In most cases, amplifiers operate as a linear device under small signal conditions. However it becomes more nonlinear and distorting with increasing drive levels. It is applied in many fields, such as communication, mathematical, biology.

This thesis is aiming to investigate the differences between linear and nonlinear modeling of circuits by modeling of a device and implementing a measurement system for electrical devices in MATLAB^® as the tool. The approach to fulfill our aim is to find the coefficients of the model and getting the error between models and measured. In this thesis, the error is used to determine the goodness of fit in a specific model.

Through working while following our project design, a comparison is made in the end between the modeling capabilities for two model structures: linear and polynomial, for two operation modes of an amplifier with lower and higher input power.