Clock recovery using between-interval timing error estimation
AssigneeCredo Technology Group Limited
InventorsFang Cai, Junqing Sun, Haoli Qian
Life of this patent
Estimating the term…
Abstract
Disclosed clock recovery modules provide improved performance with only limited complexity and power requirements. In one illustrative embodiment, a clock recovery method includes: oversampling a receive signal to obtain mid-symbol interval (MSI) samples and between-symbol interval (BSI) samples; processing at least the MSI samples to obtain symbol decisions; filtering the symbol decisions to obtain BSI targets; determining a timing error based on a difference between the BSI samples and the BSI targets; and deriving from the timing error a clock signal for said oversampling.
Claims14
A clock recovery method that comprises:
- oversampling a receive signal to obtain mid-symbol interval (MSI) samples and between-symbol interval (BSI) samples;
- processing at least the MSI samples to obtain symbol decisions;
- filtering the symbol decisions to obtain BSI targets;
- determining a timing error based on a difference between the BSI samples and the BSI targets;
- and
- deriving from the timing error a clock signal for said oversampling.
A high-speed receiver that comprises:
- an analog to digital converter that oversamples a receive signal to obtain mid-symbol interval (MSI) samples and between-symbol interval (BSI) samples;
- an equalizer that processes at least the MSI samples to obtain symbol decisions;
- a target filter that operates on the symbol decisions to provide BSI targets;
- an error calculator circuit that determines a timing error based on a difference between the BSI samples and the BSI targets;
- and
- a clock generator that adjusts a clock signal for the analog to digital converter based on the timing error.
Dependencies are inferred from the claim text.