| 摘要 |
A constant voltage circuit formed of MOS transistors is provided, which comprises a reference voltage generator and an error amplifier performing the temperature compensation of a reference voltage outputted from the reference voltage generator and outputting a constant voltage. The reference voltage generator comprises first, second and third MOS transistors each driven by a constant current source, and outputs the reference voltage to the connecting end with the error amplifier. The error amplifier includes a differential pair of fourth and fifth MOS transistors whose capacity ratio is 1:K1, and an active load composed of sixth and seventh transistors whose capacity ratio is 1:K2. One of input pair of the differential pair is applied with the reference voltage and the other thereof is applied with a voltage obtained by dividing the constant voltage. The output voltage of the differential pair is outputted to the outside as the constant voltage from an output circuit including resistors for dividing the constant voltage.
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