| 摘要 |
PROBLEM TO BE SOLVED: To favorably suppress increase in the size of a circuit even when a plurality of delay signals, in which a minimum unit of the delay amount is different from one another, are generated for one input signal. SOLUTION: Based on data modulated with a DVD encoder or a CD encoder, a write pulse which controls an output of a laser irradiated on an optical disc is generated. The write pulse is generated by logically synthesizing delay signals D1-D4 provided by respectively delaying signals to be delayed S1-S4 at each delay circuit 220 whose delay amount is controlled by a delay amount control circuit 210 at a logic circuit 300. In the delay amount control circuit 210, an output signal of a voltage controlled oscillator 211 is constituted by connecting a plurality of stages of delay elements 211a having the same constitution as each delay element 221 of the delay circuit 220 in ring-form, and is locked at a position where the delay amount of the delay element 211a becomes integer-th part of a single period of a reference clock. COPYRIGHT: (C)2004,JPO
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