I. Introduction
A new step was given to state of the art with the experimental verification of the existence of the memristor device in the laboratory of Hewlett-Packard in past 2008 [1]. First theorized by Leon Chua in 1971 [2] as the fourth fundamental circuit element the memristor has been characterized as a device that retains the information as conductance. Although this device was first implemented as part of RRAM (Resistive Random-Access Memory) its analogy to biological synapses makes this device a promise to research in the field of neuromorphic circuits [3] [4] [5]. Also,the memristor can be applied to analog and radio frequency circuits [6] [7].