Reducing phase locked loop phase lock time
AssigneeInternational Business Machines Corporation
InventorsMark Ferriss, Alexander V. Rylyakov, Jose A. Tierno
Life of this patent
Estimating the term…
Abstract
There is provided a method for reducing lock time in a phase locked loop. The method includes detecting a saturation condition on a path within the phase locked loop. The method further includes temporarily applying saturation compensation along the path when the saturation condition is detected.
Claims25
A method for reducing lock time in a phase locked loop, the method comprising:
- detecting a saturation condition on a path within the phase locked loop;
- and
- temporarily applying saturation compensation along the path when the saturation condition is detected.
An apparatus for reducing lock time in a phase locked loop, the apparatus comprising:
- a saturation compensator for detecting a saturation condition on a path within the phase locked loop, and temporarily applying saturation compensation along the path when the saturation condition is detected.
A non-transitory computer readable storage medium comprising a computer readable program, wherein the computer readable program when executed on a computer causes the computer to perform the following:
- detect a saturation condition on a path within the phase locked loop;
- and
- temporarily apply saturation compensation along the path when the saturation condition is detected.
A method for reducing lock time in a phase locked loop having an integral control path and a proportional control path, the method comprising:
- detecting a saturation condition on the proportional control path;
- and
- temporarily applying saturation compensation along the proportional control path when the saturation condition is detected by adjusting a relative gain on the proportional control path,
- wherein the proportional control path includes a coarse band controller for controlling an oscillator coarse band, and the relative gain on the path is adjusted by modulating the oscillator coarse band between an incremented state and an original state to provide at least one of a reduced average frequency change and a reduced average phase change over a given time period as compared to using only the incremented state, the original state corresponding to a non-saturation condition of the proportional control path.
Dependencies are inferred from the claim text.