Patent ID: 8766737

Claim:
An oscillation device comprising a crystal oscillation circuit which is driven by a constant voltage output from a constant voltage circuit, the constant voltage circuit comprising: a reference voltage circuit including a constant current source, and a first MOS transistor which outputs a reference voltage by a constant current of the constant current source; a differential amplification circuit which inputs the reference voltage and a feedback voltage; a second MOS transistor which outputs a constant voltage to an output terminal of the constant voltage circuit by an output of the differential amplification circuit; a temperature characteristic regulation element having a first terminal connected to the output terminal and to an output of the second MOS transistor; and a third MOS transistor connected between a second terminal of the temperature characteristic regulation element and a ground connection to output the feedback voltage, wherein the constant voltage output from the constant voltage circuit has a first voltage response to a temperature change, an oscillation stop voltage of the crystal oscillation circuit has a second voltage response to the temperature change, a consumption current of the crystal oscillation circuit has a correlation with a difference between the first voltage response and the second voltage response, and the temperature characteristic regulation element regulates the first voltage response to minimize the difference between the first voltage response and the second voltage response.