Circuit device, oscillator, electronic apparatus, and vehicle

A circuit device comprising:

• an output buffer circuit which is coupled between a first power supply voltage node and a second power supply voltage node, and which is configured to output a clock signal from an output node;
• and
• a control circuit configured to control an operation of the output buffer circuit, wherein
• the output buffer circuit includes
• a first MOS transistor of a first conductivity type a source of which is coupled to the first power supply voltage node,
• a second MOS transistor of a second conductivity type a source of which is coupled to the second power supply voltage node,
• a first variable resistance circuit which is coupled between a drain of the first MOS transistor and the output node, and which includes a first switch, and
• a second switch coupled between the drain of the first MOS transistor and the second power supply voltage node, and
• the control circuit performs control of
• making the first switch OFF and making the second switch ON when the clock signal fails to be output from the output node, and
• making the first switch ON and making the second switch OFF when the clock signal is output from the output node.