MAGNETIC FIELD SENSOR AND APPARATUS FOR MEASURING MAGNETIC FIELD

摘要

A magnetic field sensor of the present invention comprises: a first electrode at least partially comprising a magnetic substance; a second electrode at least partially comprising a non-magnetic substance; a common electrode which is positioned between the first electrode and the second electrode and is connected to a ground end; a power supplier, which has one end connected to the first and second electrodes and the other end connected to the common electrode, for supplying power in the frequency band which is desired to be measured; a variable resistor for controlling at least one resistance value of the resistance value between the first electrode and the power supplier, and the resistance value between the second electrode and the power supplier; and a differential amplifier, connected to the first electrode through a positive terminal and connected to the second electrode through a negative terminal, for outputting a difference value between a first capacitance, formed by the first electrode, and a second capacitance, formed by the second electrode, in accordance with an application of a magnetic field from the outside.