Clock data recovery with decision feedback equalization
AssigneeKandou Labs, S.A.
InventorsAli Hormati, Richard Simpson
Life of this patent
Estimating the term…
Abstract
Methods and systems are described for generating two comparator outputs by comparing a received signal to a first threshold and a second threshold according to a sampling clock, the first and second thresholds determined by an estimated amount of inter-symbol interference on a multi-wire bus, selecting one of the two comparator outputs as a data decision, the selection based on at least one prior data decision, and selecting one of the two comparator outputs as a phase-error indication, the phase error indication selected in response to identification of a predetermined data decision pattern.
Claims20
A method comprising:
- generating two comparator outputs by comparing a received signal to a first threshold and a second threshold according to a sampling clock, the first and second thresholds determined by an estimated amount of inter-symbol interference on a multi-wire bus;
- selecting one of the two comparator outputs as a data decision, the selection based on at least one prior data decision;
- and
- selecting one of the two comparator outputs as a phase-error indication, the phase error indication selected in response to identification of a predetermined data decision pattern.
An apparatus comprising:
- two comparators configured to generate two comparator outputs, the two comparators configured to compare a received signal to a first threshold and a second threshold according to a sampling clock, the first and second thresholds determined by an estimated amount of inter-symbol interference on a multi-wire bus;
- a data decision selection circuit configured to select one of the two comparator outputs as a data decision, the selection based on at least one prior data decision;
- and
- a phase-error indication selection circuit configured to select one of the two comparator outputs as a phase-error indication in response to receiving a selection signal from a pattern detection circuit configured to identify a predetermined data decision pattern.
Dependencies are inferred from the claim text.