Patent ID: 7391273

Claim:
A clock signal output device, comprising: a reference oscillator generating a reference clock signal; a first divider circuit obtaining said reference clock signal from said reference oscillator and outputting a comparison signal and an output clock signal, said reference oscillator being a crystal oscillator; an intermittently driven unit having a high-precision oscillator generating a high-precision clock signal having higher precision than said reference oscillator, dividing said high-precision clock signal and generating a clock signal, comparing said comparison signal and said clock signal, and outputting first correction data, said high-precision oscillator being an atomic oscillator; an intermittent drive unit intermittently driving said high-precision; and a correction unit obtaining said first correction data from said intermittently driven unit each time when said high-precision oscillator is driven, and outputting a pacing signal to said first divider circuit on the basis of said first correction data, wherein said first divider circuit outputs said output clock signal on the basis of said pacing signal, fluctuation of frequency deviation of said crystal oscillator due to an aging characteristic of said crystal oscillator is corrected to frequency deviation of said atomic oscillator by intermittently driving said atomic oscillator.