Influence clock data recovery settling point by applying decision feedback equalization to a crossing sample

摘要

An apparatus including a receiver coupled to receive an input signal from a communication link and operable to employ decision feedback equalization to the input signal of the communication link and generate an edge sample signal. The apparatus also includes a timing recovery module coupled to the receiver and operable to receive the edge sample signal and use the edge sample signal to generate a data sampling phase signal, wherein the edge sample signal influences a settling point of the data sampling phase signal.

主权项

1. An apparatus comprising:
a first module coupled to an input signal and operable to generate an edge signal using a first clock signal, wherein said first module further comprises:
a first path coupled to said input signal, said first path comprising:
a first preamplifier;a first summing node coupled to said first preamplifier; anda first latch coupled to said first summing node and said first clock signal;a second path coupled to said input signal, said second path comprises:
a second preamplifier;a summing node coupled to said second preamplifier and operable to apply feedback to its input signal based on a previously generated data sample; anda second latch coupled to said second summing node; anda multiplexer coupled to said first latch and said second latch, said multiplexer operable to select an output between said first latch and said second latch based on an exclusive OR of a first and a second previously generated data samples; and a second module operable to receive said edge signal and further operable to generate a data sampling phase signal, wherein said edge signal influences a settling point of said data sampling phase signal.