Importance

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Abstract

A device for measuring an electrical quantity of a system under measurement including a Hall element equipped with a pair of current input terminals and a pair of voltage output terminals. In the Hall element, four equivalent resistances are formed. The device also includes a device for applying a magnetic field proportional to a value of a first current on the Hall element, and a current supply circuit for flowing a second current between the current input terminals. The device further includes an output circuit for detecting a first voltage appearing between the output voltage terminals and outputting the first voltage as a measured value corresponding to the electrical quantity, and an offset compensation circuit for detecting an offset appearing between the voltage output terminals for varying one of the four equivalent resistances based on the offset thus detected so as to compensate the offset. The device also includes an input resistance control circuit for varying remaining three of the equivalent resistances such that a second voltage generated between the current input terminals caused by a flow of the second current is maintained at a predetermined value. An input resistance value of the Hall element is thereby held constant.

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First Claim