| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a duty detection circuit applicable to a multi-phase DLL circuit in which discharge speed and charging speed can be kept constant and a large potential difference appears on the detection line, and to provide a DLL circuit employing it. <P>SOLUTION: The duty detection circuit comprising discharge transistors TR1 and TR2, charging transistors TR3 and TR4, detection lines LDUTYHB and LDUTYLB, and a comparison circuit COMP for detecting the potential difference of the detection lines is further provided with gate control circuits G11-G14 for controlling the discharge transistors TR1, TR2 and the charging transistors TR3, TR4 in response to an internal clock signal in an even cycle. The detection line is charged/discharged in response to the internal clock signal in the even cycle, the duty detection circuit is applicable to a multi-phase DLL circuit and the potential difference appearing on the detection line can be ensured sufficiently. <P>COPYRIGHT: (C)2009,JPO&INPIT |
