FREQUENCY DIVIDER AND PHASE-LOCKED LOOP INCLUDING THE SAME

摘要

PURPOSE: A frequency demultiplier and a phase fixing loop including the same are provided to efficiently a demultiply ratio by using a demultiply control signal. CONSTITUTION: A first edge detecting unit(110) detects a first edge of an input signal based on a demultiply control signal to generate a first count signal. A second edge detecting unit(120) detects the first edge or a second edge of the input signal based on the demultiply control signal to generate a second count signal. A pulse triggered buffer unit(130) transits a logical level of an output node based on the first and the second count signals to generate an output signal. A mode selecting unit(140) sets a preset demultiply ratio as an odd demultiply ratio or an even demultiply ratio based on a selecting signal.