| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit configuration for achieving a portable parametric magnetic sensor that can be used by a dry battery for a long time. SOLUTION: A sensor is driven at a low voltage by a sensor circuit in which all operational amplifiers in an oscillation circuit 11, a GIC circuit 21 and a constant current circuit 22 are amplifiers for a single power source, and an input transistor of the GIC circuit 22 is changed. Accordingly, the circuit structure does not require a DC-DC converter and can suppresses the current consumption of the sensor and drive the sensor for a long time by a dry battery. COPYRIGHT: (C)2011,JPO&INPIT
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