DRIVING CIRCUIT FOR MAGNETIC IMPEDANCE EFFECT ELEMENT

摘要

PROBLEM TO BE SOLVED: To realize a magnetic impedance effect element for which winding an exciting coil can be simplified in work and structure by reducing the exciting coil and which can be power-saving. SOLUTION: The circuit has a differential amplifier 7c for differentially amplifying a voltage appearing to a first magnetic impedance effect element 4 and a voltage appearing to a second magnetic impedance effect element 6, and an exciting coil 10 for negative feedback which applies a negative feedback magnetic field to the first magnetic impedance effect element 4 and second magnetic impedance effect element 6. The exciting coil 10 for negative feedback is biased with an equal voltage to a central value of an output voltage of the differential amplifier 7c, and a feedback current is sent from the output side of the differential amplifier 7c to the exciting coil 10 for negative feedback.