A phase lock loop or the loop locked in Phase (PLL) is a control system electronic which is a signal locked in Phase proportional to input or reference (reference), etc. makes. PLL in a feedback common negative by comparing the output of "oscillator control the incoming voltage (VCO)", and the input reference frequency, detector, phase, etc. done. Detector phase to steer the phase of an oscillator, to a reference signal input, can be used. This kind of circuits, is widely used in Radio, Communication, Telecommunication, computers, and other applications E. that is: **the construction of one or a few frequency, that in terms of sustainability and stability to the frequency of the reference reach.