Modeling of linear isolator utilizing giant magnetoresistance elements

Abstract

A linear giant magnetoresistive (GMR) isolator was modeled and the output voltage and current in relation to the input current were investigated. The feedback coil current (output current) corresponding to the input coil current closely matched the reported experimental results when the gain of the op-amp modeled was high (500). In the triangular input current wave response, feedback coil current faithfully followed the input current when the slew rate of the input coil current was equal to or lower than that of the op-amp and the input coil current amplitude was within the linear region of the isolator response.