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US 2006/0125537 A1Published application
Phase lock loop device
AssigneeVIA Technologies, Inc.
InventorTse-Hsien Yeh
Life of this patent
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Abstract
A phase lock loop device further includes a probability shaping device provided between a phase detection device and charge pump and loop filter (CPLF) device. The probability shaping device operates to reduce the frequency of outputting up-index or down-index; thereby shaping probability distribution to reduce degradation due to mismatching of the CPLF device.
Claims18
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.
2 more elements
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 second down-index;
- a probability shaping device coupled to the output of the phase detection device to generate a second up-index and a second down-index and reducing the expected values of the second up-index and second down-index when the probability that the phase detection device outputs the first up-index is substantially equal to that of outputting the first down-index;
- 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.
2 more elements
Dependencies are inferred from the claim text.