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US 8,798,126 B2Granted
Receiver calibration using offset-data error rates
AssigneeHewlett-Packard Development Company, L.P.
InventorsDacheng Zhou, Daniel Alan Berkram, Peter David Maroni
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Abstract
During a calibration process, a data input signal is sampled using each of plural receiver equalization setting. For each of the receiver equalization settings, a respective offset-data error-rate is measured. Based on the offset-data error-rate measurements, an equalizer setting is selected for use during normal non-calibration operation of the receiver.
Claims15
A calibration process comprising:
- sampling a data-input signal using first and second samplers that are operated in-phase with respect to each other and using respective first and second reference voltages that are offset from each other so as to yield respective first and second data-symbol sequences;
- measuring offset-data error rates for plural equalization settings of a receiver by obtaining offset-data error-rate measurements for respective ones of said equalization settings while sampling said data-input signal, said measuring including comparing said first and second symbol sequences on a symbol-by-symbol basis;
- and
- selecting an equalizer setting for normal non-calibration operation of a continuous-time equalizer of said receiver based on said offset-data error-rate measurements.
1 more element
A receiver comprising:
- a continuous-time equalizer (CTE) to equalize a received data input signal to yield an equalized data input signal, said CTE having selectable equalization settings;
- a sampling module configured to generate plural concurrent data-symbol sequences by sampling instances of said equalized data input signal by operating respective samplers in-phase with respect to each other using respective references offset with respect to each other;
- an offset-data error-rate meter to provide offset-data error-rate measurements by comparing said data-symbol sequences on a symbol-by-symbol basis;
- and
- a calibration controller to select among said equalization settings based on said offset-data error-rate measurements.
2 more elements
Dependencies are inferred from the claim text.