Estimating read reference voltage based on disparity and derivative metrics
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United States of America Patent
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Aug 16, 2016
Grant Date -
Dec 10, 2015
app pub date -
Jun 9, 2014
filing date -
Jun 9, 2014
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Abstract
An adaptive channel tracking algorithm performed by a flash memory system obtains disparity metrics and derivative metrics and uses a combination of the disparity and derivative metrics to estimate an optimal read reference voltage. The estimation of the optimal read reference voltage does not rely on assumptions about the underlying cell voltage distributions and results in a good estimate of the read reference voltage even if the standard deviations of the cell voltage distributions are different. In addition, the algorithm is relatively simple and less computationally intensive to perform than the known tracking algorithms.
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