| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a PLL circuit which can properly and automatically set specification of a noise filter circuit. <P>SOLUTION: The PLL circuit includes: a filter circuit which performs filter processing to a first clock signal to generate a second clock signal; a phase comparator circuit which generates a control signal according to a phase comparison result between the second clock signal and a third clock signal; and an oscillation circuit including at least a first delay circuit which brings signal delay according to a value of the control signal to oscillate the third clock signal according to the signal delay, wherein the filter circuit includes a second delay circuit with the same configuration as that of the first delay circuit to bring the signal delay according to the value of the control signal, performs the filter processing to the first clock signal by the second delay circuit to generate the second clock signal. <P>COPYRIGHT: (C)2011,JPO&INPIT |
