Clock signal output apparatus and control method of same, and electric apparatus and control method of same

Abstract

Provided are a clock signal outputting device and its control method, and an electronic device and its control method, which can enhance the precision of a clock signal while avoiding an increase in the entire power consumption even if a highly precise oscillator of a relatively high power consumption is used. The clock signal output device includes a quartz oscillator (41) for generating a reference clock signal (CL1), and generates and outputs an outputted clock signal (CL0) of a predetermined frequency from the reference clock signal (CL1). The clock signal output device further includes an atomic oscillator (42) for generating a clock signal (CL2) of a higher precision than that of the quartz oscillator (41), an intermittent time managing unit (47) for driving the atomic oscillator (42) intermittently, and a correction unit (46) for acquiring correction data to correct the displacement of the outputted clock signal (CL0) with reference to the clock signal (CL2), each time the atomic oscillator (42) is driven, thereby to correct the outputted clock signal (CL0) on the basis of that correction data.

Description

technical field [0001] The present invention relates to a clock signal output device having a reference oscillator for generating a reference clock signal and generating and outputting an output clock signal of a predetermined frequency based on the reference clock signal, a control method thereof, an electronic device and a control method thereof. Background technique [0002] Conventionally, there is an electronic timepiece that divides the frequency of a reference clock signal output from a reference oscillator to generate, for example, a 1 Hz signal, and keeps time based on the 1 Hz signal. Such an electronic timepiece is known as an annual difference clock, which uses a temperature compensated crystal oscillator (Temperature Compensated Crystal Oscillator) as a reference oscillator, and realizes an annual difference within ±tens of seconds (for example, Patent Document 1). In recent years, standard oscillators using atomic oscillators have been proposed (for example, Pa...

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Problems solved by technology

[0006] However, the conventional temperature-compensated crystal oscillator adopts a structure that temperature-compensates the temperature characteristic of the crystal having the third-order characteristic according to the temperature characteristic of the capacitance having the second-order characteristic, so the oscillation frequency changes with temperature

In addition, this type of crystal oscillator changes the oscillation frequency over a long period of time due to the aging characteristics of the crystal, and its frequency accuracy is poor compared to atomic oscillators.

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