Live offset cancellation of the decision feedback equalization data slicers
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United States of America Patent
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Jun 6, 2023
Grant Date -
N/A
app pub date -
Dec 10, 2019
filing date -
Dec 12, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
A receiver utilizes loop-unrolled decision feedback equalization (DFE). For each sample, two comparators, each configured with different thresholds, sample an input signal. The output of one of these comparators is selected and used as the output of the receiver and may be optionally input to additional DFE circuitry. The output of the other (non-selected) comparator is used to adjust an input offset voltage of that same comparator. Adjustments to the offset voltages of the comparators may be based on a statistical analysis of the respective outputs of the two comparators when not selected. Adjustments to the offset voltages of the comparators may be based on comparisons between the respective outputs of the two comparators when not selected to the outputs of a reference comparator that has been calibrated for minimal or zero offset.
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