| 摘要 |
PROBLEM TO BE SOLVED: To improve the power source voltage removing ratio of a temperature detecting circuit using a band gap reference voltage circuit without being accompanied by enlargement of chip size or increase in power consumption. SOLUTION: A constant voltage signal VN obtained within a band gap reference voltage circuit 1 is increased prescribed-fold by a buffer amplifier 2 having a low output impedance to form a reference voltage VREREF. This reference voltage VREF is divided by a voltage dividing circuit 3 to generate a divided voltage VREREF/β. In a constant-fold circuit 4 operated with the reference voltage VREF as positive power source voltage, the difference between the voltage differenceΔVBE according to the temperature change of absolute temperature obtained from both ends of a resistor R2 within the band gap reference voltage circuit and the divided voltage VREF/βdivided by the voltage dividing circuit 3 is increased prescribed-fold, and the result is outputted as a temperature detecting circuit VOUT.
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