Invention Grant
- Patent Title: Method and apparatus for faster determination of cell state of a resistive memory cell using a parallel resistor
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Application No.: US15254630Application Date: 2016-09-01
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Publication No.: US09953706B2Publication Date: 2018-04-24
- Inventor: Nikolaos Papandreou , Charalampos Pozidis , Abu Sebastian , Milos Stanisavljevic
- Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
- Applicant Address: US NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: US NY Armonk
- Agency: Tutunjian & Bitetto, P.C.
- Agent Vazken Alexanian
- Priority: GB1405374.8 20140326
- Main IPC: G11C11/00
- IPC: G11C11/00 ; G11C13/00 ; G11C11/56

Abstract:
A device for determining an actual cell state of a resistive memory cell having a plurality M of programmable cell states comprising a sensing circuit, a settling circuit, a prebiasing circuit, and a resistor coupled in parallel to the resistive memory cell, wherein the resistor is configured to reduce an effective resistance seen by the prebiasing circuit. The sensing circuit is configured to sense a sensing voltage of the resistive memory cell and output a resultant value in response to the sensing voltage which is indicative for the actual cell state. The settling circuit is configured to settle the sensing voltage to a certain target voltage representing one of the M programmable cell states. The prebiasing circuit is configured to prebiase a bitline capacitance of the resistive memory cell such the sensing voltage is close to the certain target voltage.
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