| 摘要 |
PROBLEM TO BE SOLVED: To reduce pull-in time at the time of returning from both system disconnection of the power supply disconnection of a package and a reference phase CLK (clock) at the time of package operation start (mounting on a device). SOLUTION: An up/down counter 7 is operated by using a CLK 117 having N-fold repeating frequency of a usually used CLK 115 with error recovery as a trigger and the oscillation frequency of a VCO(voltage controlled oscillator) 6 is controlled in the case of performing a restoration (re-pull-in) operation from at the time of returning, etc., from at the time of reference phase CLK lock deviation. Thus, it is possible to reduce pull-in time because a tracking frequency is switched to N-fold frequency of a normal operation. |
