On the Realization of Power-Law Based Impedance Functions: Application to Edible Drinks

A novel procedure for compact realization of complex, multiple-parameter impedance functions is introduced in this paper. The concept is based on the consideration of the whole impedance function and the approximation of its frequency characteristics through a suitable curve-fitting-based algorithm, instead of separately approximating the intermediate terms of the function. In this way, the total impedance is implemented by a topology which is based on one transfer function, offering the benefit of reduced complexity. The impedance function that describes the electrical properties of edible drinks can be considered as a characteristic example and, therefore, is used for the verification of the proposed concept. Different samples of drinks, red wine from Bairrada, semi-skimmed and organic semi- skimmed milk, are considered with the behavior of the proposed schemes being evaluated through simulation and experimental results.