Patent ID: 7567643

Claim:
A phase lock loop device, comprising: a phase detection device coupled to an input data signal and a clock signal to detect the phase difference between the input data signal and the clock signal and output a first up-index or a first down-index; a probability shaping device coupled to the output of the phase detection device to process the first up-index and first down-index and output a second up-index or a second down-index according to the processing result such that the frequency of outputting the second up-index or the second down-index is less than that of outputting the first up-index or the first down-index output from the phase detection device; a charge pump and loop filter (CPLF) device coupled to the probability shaping device to output and adjust a control voltage according to the second up-index or second down-index received by the CPLF device; and a voltage control oscillator coupled to the control voltage to change frequency or phase of the clock signal according to the control voltage and output the clock signal to the phase detection device; wherein the probability shaping device monitors the occurrence number that the first up-index and first down-index is output, and outputs the second up-index when the occurring number of the first up-index is greater than or equal to a first value and outputs the second down-index when the occurrence number of the first down-index is greater than or equal to a second value and the probability shaping device comprises: an operation device coupled to the phase detection device, performing an addition to an account result when the phase detection device outputs the first up-index and performing a subtraction to the account result when the phase detection device outputs the first down-index; a delay unit coupled to the output of the operation device, delaying the output of the operation device to generate and output the account result to the operation device; and a decision device coupled to the output of the delay unit, outputting the second up-index when the account result is greater than or equal to a positive integer and outputting the second down-index when the account result is less than or equal to a negative integer.