DLL CIRCUIT AND SEMICONDUCTOR DEVICE INCLUDING THE SAME

摘要

<P>PROBLEM TO BE SOLVED: To provide a DLL circuit capable of preventing the occurrence of malfunction due to aliasing. Ž<P>SOLUTION: The DLL circuit includes: a delay line 110 for generating an internal clock signal LCLK by delaying an external clock signal CLK; a counter circuit 130 for setting a delay amount of the delay line 110; a phase detection circuit 140 for generating a phase determination signal PD0 based on a phase of the external clock signal CLK; and an antialiasing circuit 200 for prohibiting the counter circuit 130 from updating a count value based on the phase determination signal PD in response to a state that a jitter component included in the external clock signal CLK is predetermined frequency and more. Consequently, a problem that the internal clock signal LCLK is continuously controlled to a wrong direction due to malfunction of aliasing does not occur. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž