To provide a circuit capable of having a primary temperature characteristic without including a high-order component with respect to a temperature change and in which an adjustment width of a temperature coefficient is independent from a temperature coefficient of resistance.
This invention includes: a reference voltage generating circuit 2, a current source 6, and a sensor drive current generating circuit 3. The sensor drive current generating circuit 3 has variable resistances VR1 and VR2 having difference temperature coefficients of resistance. The sensor drive current generating circuit 3 adds a voltage that is determined by a difference between the temperature coefficients of resistance of the two variable resistances VR1 and VR2 and the current of the current source 6, and that depends on a temperature, to a reference voltage generated by the reference voltage generating circuit 2 to generate a temperature-dependent voltage.
Megumi Konishi
Hide Tanaka Tetsu