| 摘要 |
Embodiments of the invention provide devices, systems and methods of frequency tracking, e.g., for clock and data recovery. For example, a device according to embodiments of the invention includes a frequency tracker to correct a frequency offset of a received signal in response to an overflow signal of a variable-step counter that uses a variable step increment value. The step increment value may be generated in response to a count of one or more advance indications, a count of one or more retard indications, and a current trend of the advance and retard indications. The frequency tracker may be able to track small frequency offsets and/or large frequency offsets, thereby allowing accurate control of a sampling position control. Other features are described and claimed.
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