Ablic Inc.

Hiroyuki Yonetani

Toshiyuki Tanaka

Biao Shen

Provided is a magnetic sensor device including: a current input terminal; a voltage input terminal; an output terminal; a magnetic sensor circuit including a first terminal, one of one Hall element and a set of Hall elements connected in parallel to each other, and a pilot signal generating circuit; a chopper modulator/demodulator circuit including a first mixer connected to the magnetic sensor circuit, an amplifier containing an input port connected to the first mixer, a second mixer containing an input port connected to the amplifier, and an output port connected to the output terminal; and a feedback circuit including a second terminal connected to the chopper modulator/demodulator circuit, a third mixer, a voltage-current conversion circuit, and a third terminal connected to the current input terminal and the first terminal, and a fourth terminal connected to the voltage input terminal.

Magnetic sensor device

Provided is a relaxation oscillator having an extremely small temperature deviation in oscillation frequency. A first current (I) generated by a reference voltage source and a first resistor having a positive first-order temperature coefficient is supplied to a first variable capacitor (C) for oscillation, and a second current (I) generated by a reference voltage source and a second resistor having a negative first-order temperature coefficient is supplied to a second variable capacitor (C) for oscillation. A product of a value of a ratio of a first current to a second current and a value of a ratio of a first-order temperature coefficient of the second resistor to a first-order temperature coefficient of the first resistor, and a value of a ratio of a capacitance of the first variable capacitor to a capacitance of the second variable capacitor have the same absolute value and opposite signs.

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Tokyo, Japan

Hiroyuki Yonetani