Invention Grant
US08094770B2 Dynamic phase tracking using edge detection that employs an edge counter 有权
使用边缘计数器的边缘检测进行动态相位跟踪

Dynamic phase tracking using edge detection that employs an edge counter
Abstract:
A phase-locked loop includes a sample selector configured to select a set of samples from an oversampled portion of a data signal, a dynamic phase decision control circuit configured to indicate whether a predetermined number of edges is present in the set of samples, and a phase detector configured to determine a skew condition and a direction of the skew condition of the set of samples based on the indication of the dynamic phase decision control circuit. The phase detector is configured to produce a set of skew detection signals based on at least one skew condition determination. The phase-locked loop further includes a loop filter configured to filter the set of skew detection signals. The loop filter is also configured to produce a set of phase adjustment signals based on the set of skew detection signals. The sample selector is configured to select a set of samples from the oversampled portion of the data signal, based on the set of phase adjustment signals. In one embodiment, the dynamic phase decision control circuit is also configured to detect an absence of edges in the set of samples, and a state change of the loop filter is inhibited according to the indication of the absence of edges.
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