Patent ID: 8022773
Filing Date: 2011-09-20
Classification: G06F,H03L,H04J

Abstract:
1. A clock signal generation device, comprising: a voltage-controlled oscillation unit that outputs a clock signal of an oscillating frequency according to an inputted control voltage; a time information generation unit that generates time information based on the clock signal outputted from the voltage-controlled oscillation unit; a time information comparison unit that compares the time information generated by the time information generation unit with reference time information; a control voltage instruction unit that instructs a control voltage, according to a comparison result provided by the time information comparison unit, to the voltage-controlled oscillation unit, when the comparison result exceeds a predetermined non-zero threshold, and instructs the voltage-controlled oscillation unit to keep an existing control voltage when the comparison result is between zero and the predetermined non-zero threshold; and an aging-variation information storage unit that stores a first relation between variations of the oscillating frequency over time and the control voltage, wherein the control voltage instruction unit periodically updates the oscillating frequency based on the stored relation between variations of the oscillating frequency over time and the control voltage, the aging-variation information storage stores a second relation between variations of the oscillating frequency over time and a set voltage, the set voltage being externally set to update the control voltage, and a notification unit notifies the set voltage when a predetermined time has passed and requests a correction to the set voltage to update the oscillating frequency.