Patent ID: 8717017

Claim:
A magnetic field detection apparatus comprising: at least four magneto-resistive elements including first to fourth magneto-resistive elements; a first positive-polarity terminal; a first negative-polarity terminal; a first detection terminal; a second positive-polarity terminal; a second negative-polarity terminal; a second detection terminal; two connections including first and second connections, the first connection being sequentially connected to the first positive-polarity terminal, the first magneto-resistive element, the first detection terminal, the fourth magneto-resistive element, and the first negative-polarity terminal, and the second connection being sequentially connected to the second positive-polarity terminal, the second magneto-resistive element, the second detection terminal, the third magneto-resistive element, and the second negative-polarity terminal; a circuit configured to measure a signal voltage between the first detection terminal and the second detection terminal; a first driving circuit configured to apply a voltage between the first positive-polarity terminal and the first negative-polarity terminal; and a second driving circuit configured to apply a voltage between the second positive-polarity terminal and the second negative-polarity terminal, wherein a first excitation voltage between the first positive-polarity terminal and the first negative-polarity terminal differs from a second excitation voltage between the second positive-polarity terminal and the second negative-polarity terminal.