DELAY LOCKED LOOP

摘要

PURPOSE: A delay locked loop is provided to improve noise property by making a time required for locking loop different. CONSTITUTION: A replica delay oscillator(210) generates a replica oscillation signal. A clock control part(220) receives a clock signal. A divider(230) divides the replica oscillation signal and clock signal by a first dividing ratio or a second dividing ratio. A pulse generator(240) generates a delay pulse. The delay pulse has a pulse width corresponding to a delay required for locking loop. A code value output unit(250) adjusts a code value corresponding to the pulse width of the delay pulse. A delay line(260) delays the clock signal.