Differential Programming Two-Terminal Resistive Memory Cells
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Solution Overview
Problem
Existing resistive-switching memory technologies face challenges in differential programming of two-terminal resistive switching memory cells, leading to invalid identifier bit values due to unexpected programming of memory cells.
Innovation Solution
The implementation of a differential programming process that detects program events in one cell and disconnects the second cell from the voltage source, using a detection circuit and termination circuit to prevent unwanted programming and ensure proper differential programming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If differential programming is applied to two-terminal resistive switching memory cells, then identifier bit values can be generated, but unexpected programming of memory cells occurs leading to invalid identifier bit values
Solution Approach 1:
The patent divides the programming control into separate paths for first and second memory cells. By using distinct bitlines (first bitline and second bitline) and controlling them independently through detection circuits, the system segments the programming process to prevent unintended programming of the second cell when the first cell is being programmed.
Solution Approach 2:
The patent implements a detection circuit that monitors the programming state of the first memory cell and provides feedback control. When the detection circuit identifies that the first cell has been programmed, it triggers a response to disconnect the second cell from the voltage source, preventing unexpected programming and ensuring valid identifier bit values.
2Duration of action of stationary object
If program soaking is applied to enhance programming robustness, then data longevity improves, but power consumption increases
Solution Approach 1:
The patent applies program soaking by continuing to apply voltage to the first memory cell after it has been programmed, before disconnecting it. This preliminary extended programming action ensures robust programming and enhances data longevity by stabilizing the programmed state, while the second cell is simultaneously disconnected to prevent unnecessary power consumption.
Solution Approach 2:
The patent applies excessive programming action (program soaking) selectively to only the first memory cell that needs robust programming, rather than applying continuous power to all cells. This partial application of excessive action achieves enhanced data longevity for the programmed cell while minimizing overall power consumption by disconnecting the second cell.
Data Source
AI summary
Differential programming of multiple resistive switching memory cells defining a bit is disclosed. The differential programming can mitigate invalid data values for the defined bit, referred to herein as an identifier bit. Embodiments of the present disclosure provide for detection of a program event(s) for a portion of resistive switching memory cells defining an identifier bit, and disconnecting a remainder of the memory cells from program supply voltage, prior to a duration of a program cycle. Additionally, the program cycle can be continued for the programmed memory cell(s) to facilitate a robust programming and enhance data longevity. The detection and subsequent disconnection can facilitate proper differential programming and mitigate unwanted program events that lead to invalid identifier bit results, as well as reducing power consumption for a program cycle of resistive switching memory.