DELAY LOCKED LOOP

摘要

PURPOSE: A delay locked loop is provided to obtain a reduce effect of a consumed current and rapid ability of operation by shortening a delay locking time through an open loop structure. CONSTITUTION: A delay amount pulse generating unit(210) generates a delay amount pulse having a pulse width corresponding to the delay among necessary for delay locking of a clock signal. A delay amount code unit(220) codes a delay amount necessary for delay locking by measuring the size of the delay among pulse. A delay line(230) delays the clock signal by responding to the code value. The delay amount pulse generating unit includes replica delay oscillator unit which generates a replica generating signal having a period corresponding to the replica delay. The delay amount pulse generating unit includes a pulse generating unit generating a delay amount pulse having a pulse width corresponding to the delay amount necessary for delay locking and a clock control unit outputting a clock signal by responding to the initialize signal.