| 摘要 |
Provided is a magnetic pattern detection device capable of increasing a gain without a large increase in cost. Specifically, in the magnetic pattern detection device (100); when an amplification unit (70) of a signal processing unit (60) inputs a sensor output signal and a reference voltage to an amplifier (71), the sensor output signal being output from a magnetic sensor element (40) which is excited by an excitation signal; a reference voltage generation unit (72) generates a signal varying in tandem with the excitation signal, and inputs the generated signal to an amplifier (71) as a reference voltage. The reference voltage generation unit (72) is provided with a CR differentiation circuit (73) which generates a reference voltage by differentiating the excitation signal, and, because the generated reference voltage is slightly diffrent from the sensor output signal output from the magnetic sensor element, the amplifier gain can be increased. |
