| 摘要 |
The present invention relates to a magnetism detection device capable of suppressing an amplification degree of an integrator of an offset voltage of a hall sensor at the integrator by increasing a chopper modulation frequency of the offset voltage of the hall sensor, and capable of suppressing an operation voltage range considerably at the integrator. First and second switch units (13, 14) switch a direction of a current flown from a bias generating unit (12) across two opposite terminals of four terminals of a hall sensor (11), and switch a direction of a voltage to be available in remaining two opposite terminals in the direction orthogonal to the direction of the current, respectively, so that in a first period, a polarity of a hall electromotive force is a first polarity and a polarity of the hall offset voltage alternates four times, and in a second period, the polarity of the hall electromotive force is a second polarity opposite to the first polarity and the polarity of the hall offset voltage alternates four times. |
