| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic detection apparatus, capable of highly accurately removing the offset voltage of a magnetic detection sensor and the offset voltage of an analog element of an analog circuit and is able to detect magnetism of the magnetic detection sensor with high accuracy. SOLUTION: The magnetic detector collects a Hall sensor 11 and a switch 12 of the magnetic detector, and an integrator 13, a reference voltage output circuit 14 and an A/D converter 15 into a single circuit to be constituted as a single circuit, and carries out A/D conversion on a detection signal of the Hall sensor 11, which is amplified at a high gain, by adding or subtracting a reference voltage Vref to or from the detection signal of the Hall sensor 11. As a result, the magnetic detection apparatus removes an offset voltage or noise up to the A/D converter 15, with high accuracy, to detect the magnetism of the Hall sensor 11 with high accuracy. COPYRIGHT: (C)2011,JPO&INPIT |
