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Efficient interference cancellation in analog memory cell arrays

  • US 8,209,588 B2
  • Filed: 12/11/2008
  • Issued: 06/26/2012
  • Est. Priority Date: 12/12/2007
  • Status: Active Grant
First Claim
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1. A method for operating a memory that includes analog memory cells, the method comprising:

  • storing data in a group of the analog memory cells by writing respective first storage values to the memory cells in the group;

    after storing the data, reading respective second storage values from the memory cells in the group using one or more first read thresholds;

    identifying third storage values that potentially cause cross-coupling interference in the second storage values, and processing the third storage values so as to identify a subset of the second storage values as severely-interfered storage values;

    selectively re-reading respective fourth storage values from the memory cells holding the severely-interfered storage values using one or more second read thresholds, different from the first read thresholds;

    canceling the cross-coupling interference in the severely-interfered storage values using the re-read fourth storage values; and

    processing the second storage values, including the severely-interfered storage values in which the cross-coupling interference has been canceled, so as to reconstruct the data stored in the group of the memory cells.

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