Clock generation apparatus, clock generation method, adjustment apparatus, adjustment method, and non-transitory computer readable medium

Abstract

Provided is a clock generation apparatus which generates an output clock signal, comprising: a first voltage-controlled oscillator which outputs the output clock signal; an AD converter which includes: a second voltage-controlled oscillator which outputs an internal clock signal phase-locked to the output clock signal in response to a digital temperature signal having become a value corresponding to an analog temperature signal from a temperature sensor; a phase comparator which detects a phase difference between the output clock signal and the internal clock signal; and a digital temperature signal generator which generates a digital temperature signal according to the phase difference detected by the phase comparator, to output it to the second voltage-controlled oscillator; and a digital temperature compensation circuit which compensates a frequency of the output clock signal of the first voltage-controlled oscillator by using the digital temperature signal.