Programming of phase-change memory cells
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United States of America Patent
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Jun 30, 2015
Grant Date -
May 30, 2013
app pub date -
Nov 2, 2012
filing date -
Nov 28, 2011
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Abstract
Methods and apparatus are provided for programming a phase-change memory cell having s>2 programmable cell states. At least one control signal is applied to produce a programming pulse for programming the cell. At least one control signal is varied during the programming pulse to shape the programming pulse in dependence on the cell state to be programmed and produce a selected one of a plurality of programming pulse waveforms corresponding to respective programming trajectories for programming the cell states. The selected programming pulse waveform corresponds to a programming trajectory containing the cell state to be programmed.
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