Pulse or digital communications – Synchronizers – Synchronizing the sampling time of digital data
Reexamination Certificate
2011-08-02
2011-08-02
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Synchronizers
Synchronizing the sampling time of digital data
Reexamination Certificate
active
07991096
ABSTRACT:
A data sampling circuit that employs an oversampling clock to oversample a data signal, a phase tracking circuit for use in such a sampling circuit, and a receiver and system including such a sampling circuit. Preferably, phase tracking is implemented by systematically identifying and rejecting at least one worst sampling position, and sampling the data signal at a non-rejected sampling position. Preferably, phase tracking is accomplished by counting through-transitions of edges of the sampled data signal through each oversampling position, and rejecting an oversampling position having a highest count of through-transitions. In some embodiments, different phase tracking methods (at least one of which includes the step of generating through-transition counts) are used for different types of input data. Other aspects of the invention are methods for determining an oversampling position for oversampling a data signal, and methods for oversampling a data signal including by generating through-transition counts.
REFERENCES:
patent: 5905769 (1999-05-01), Lee et al.
patent: 6560290 (2003-05-01), Ahn et al.
patent: 7062004 (2006-06-01), Kim et al.
patent: 2003/0169831 (2003-09-01), Neugebauer et al.
Choi Hoon
Kim Bruce
Kim Gyudong
Girard & Equitz LLP
Liu Shuwang
Neff Michael R
Silicon Image Inc.
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