| 摘要 |
PROBLEM TO BE SOLVED: To provide a DLL system without the convergence of malfunction. SOLUTION: A DLL malfunction preventing circuit 1 inputs a control voltage VD1 from a DLL circuit and a control voltage VD2 from a PLL circuit 3. When the control current of the DLL circuit is changed to an abnormal value, the operation of a phase control circuit 4 is stopped, the output of a charge pump circuit 5 is controlled via the circuits of MP3 and MN3 and the control current is controlled to become a normal value. |
