The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 15, 2010
Filed:
Sep. 28, 2005
Guillaume Fortin, Verdun, CA;
Larrie Carr, Nelson, CA;
Yuiry Greshishchev, Kanata, CA;
Alex Cochran, Langley, CA;
Junqi (Paul) Hua, Center Valley, PA (US);
Guillaume Fortin, Verdun, CA;
Larrie Carr, Nelson, CA;
Yuiry Greshishchev, Kanata, CA;
Alex Cochran, Langley, CA;
Junqi (Paul) Hua, Center Valley, PA (US);
PMC-Sierra, Inc., Santa Clara, CA (US);
Abstract
Techniques and apparatus for a clock and data recovery circuit to lock to data having frequency offsets relative to a local clock reference are disclosed. One embodiment includes a multi-step frequency tracking system in which each step is used to track a sub-range of frequency deviation from local clock reference. The frequency tracking sub-range of each step is selected so that the clock and data recovery system is relatively assured of achieving lock when the frequency of the incoming data lies within or is relatively near the frequency tracking sub-range of the selected step. Embodiments may use control signals to select the sub-ranges, and hence guide the frequency tracking portion of the clock and data recovery circuit to operate in a frequency tracking range that is optimized for achieving and maintaining lock.