PSpice Model for a Current Sensor Based on Spin-Valve Magnetoresistive Microstructure

In this work a PSpice model for a spin-valve magnetoresistance microstructure current sensor was described and validated. Starting from the experimental characteristics of the sensor, the model was implemented using LookUp-Table method, which is a table-based approach to the empirical modeling. To obtain a PSpice model with a behavior closer to that of the real sensor, an improvement is made by introduction of several points on the structure characteristic, and then, using the same method based on LookUp-Table, the model was tested again. In order to achieve additional points, the equation of the characteristic was extracted in MATLAB, by interpolating the measurement points obtained by laboratory measurements with a higher order polynomial. Once the model is validated, it can be used to model other types of structures and to simulate electronic circuits that are composed of magnetic current sensors of this type.