Apparatus and method for refreshing or toggling a...

Static information storage and retrieval – Systems using particular element – Amorphous

Reexamination Certificate

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C365S222000, C365S189090, C365S185210

Reexamination Certificate

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07986549

ABSTRACT:
An apparatus and a method for refreshing or toggling a phase-change memory cell are described. The apparatus includes a voltage ramp element coupled to the phase-change memory cell and provided for controlling voltage across the phase-change memory cell. A current control element is coupled to the phase-change memory cell and provided for controlling current through the phase-change memory cell. A current sensor element is coupled to the phase-change memory cell. A write-back timer and control element is coupled to the current sensor element and to the current control element.

REFERENCES:
patent: 7030640 (2006-04-01), Yee et al.
patent: 7593255 (2009-09-01), Happ et al.
patent: 7729163 (2010-06-01), Ramani et al.
patent: 7791935 (2010-09-01), Kang et al.
patent: 7796424 (2010-09-01), Happ et al.
Ielmini, Daniele, et al. “Recovery and Drift Dynamics of Resistance and Threshold Voltages in Phase-Change Memories,” IEEE Transactions on Electron Devices, vol. 54, No. 2, Feb. 2007, pp. 308-315.
Lai, Stefan “Current status of the phase change memory and its future,” IEEE, Electron Devices Meeting, 2003, pp. 255-258.

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