Circuit device and oscillator

Abstract

A circuit device includes an oscillation circuit configured to cause a resonator to oscillate and generate an oscillation signal, a temperature compensation circuit configured to output a temperature compensation voltage for an oscillation frequency of the oscillation signal to the oscillation circuit based on a temperature detection voltage from a temperature detection circuit, a power supply circuit configured to generate a power supply voltage of the temperature compensation circuit, and a reference voltage generation circuit for temperature compensation configured to generate a reference voltage for temperature compensation and output the reference voltage to the temperature compensation circuit. Noise of the reference voltage is smaller than noise of the power supply voltage, and a temperature characteristic of the power supply voltage is flatter than a temperature characteristic of the reference voltage.

Dependencies are inferred from the claim text.