Patent ID: 7728640

Claim:
A DLL circuit comprising: a delay line configured to output a plurality of delayed signals of a reference signal, the delay line including, a plurality of first delay units connected in series with each other, each of the first delay units being configured to output a delayed signal of the reference signal, a blocking circuit inserted between a first and second of the plurality of first delay units, the blocking circuit being capable of switching between passing and blocking an input delayed signal of the reference signal, and the delay time of the blocking circuit being integer times as large as each of the delay time of the first delay units, and one or more second delay units connected in parallel with the blocking circuit, the same signal as the delayed signal that is input in the blocking circuit being input in the second delay units, each of the second delay units being configured to output a delayed signal of the reference signal, and the delay time of each of the second delay units being equal to the delay time of each of the first delay units; and a blocking control circuit configured to control the blocking circuit whether to pass or block the delayed signal that is input in the blocking circuit.