| 摘要 |
A magnetic sensor circuit has Hall devices 10 X and 10 Y, selection switch circuits 20 X and 20 Y, amplifier units 30 X ad 30 Y, a comparison unit 60, capacitors 41 X, 42 X, 41 Y, and 42 Y, and switch circuits 51 and 52. The Hall voltages obtained from the Hall devices 10 X and 10 Y are outputted in either of a first and a second states switched by the selection switch circuits 20 X and 20 Y. The amplifier units 30 X ad 30 Y each operate differentially and, if the difference between their outputs is greater than a set hysteresis width, the output logic of a detection signal Sdet is shifted. This configuration helps reduce the influence of device offset voltages in the Hall devices, and also helps reduce the influence of input offset voltages arising in the amplifiers.
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