Circuit device and oscillator

A circuit device comprising:

• an oscillation circuit configured to generate an oscillation signal;
• and
• a temperature compensation circuit configured to perform temperature compensation for an oscillation frequency of the oscillation signal, the temperature compensation circuit including:
• a first reference current generation circuit configured to generate a first reference current;
• a second reference current generation circuit configured to generate a second reference current;
• a first compensation circuit configured to perform the temperature compensation for the oscillation frequency in a first temperature range based on the first reference current;
• and
• a second compensation circuit configured to perform the temperature compensation for the oscillation frequency in a second temperature range, which is higher than the first temperature range in temperature, based on the second reference current, wherein
• the first reference current generation circuit is configured to reduce the first reference current as a temperature rises, or the second reference current generation circuit is configured to reduce the second reference current as the temperature drops, and
• the first reference current generation circuit includes:
• a first bipolar transistor of an npn type in which a collector and a base are coupled to each other and an emitter is coupled to a low-potential-side power supply node;
• and
• a first resistor that is provided between a high-potential-side power supply node and the first bipolar transistor and whose one end on a high-potential-side power supply node side is set to a voltage having a negative temperature characteristic.

An oscillator comprising:

• a resonator;
• and
• a circuit device, wherein
• the circuit device includes:
• an oscillation circuit configured to oscillate the resonator to generate an oscillation signal;
• and
• a temperature compensation circuit configured to perform temperature compensation for an oscillation frequency of the oscillation signal,
• the temperature compensation circuit includes:
• a first compensation circuit configured to perform the temperature compensation for the oscillation frequency in a first temperature range;
• a second compensation circuit configured to perform the temperature compensation for the oscillation frequency in a second temperature range that is higher than the first temperature range in temperature;
• a first reference current generation circuit configured to generate a first reference current serving as a reference current of the first compensation circuit;
• and
• a second reference current generation circuit configured to generate a second reference current serving as a reference current of the second compensation circuit,
• the first reference current generation circuit is configured to reduce the first reference current as a temperature rises, or the second reference current generation circuit is configured to reduce the second reference current as the temperature drops, and
• the second temperature range is larger than the first temperature range.