RRAM Cell Array Forming Control with Adaptive Voltage Verification
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Solution Overview
Problem
Conventional forming control methods for resistive random-access memory cell arrays face challenges in successfully performing forming actions on a large number of cells due to increasing leakage currents and decreasing bit line voltages, leading to unsuccessful forming actions as the number of completed cells grows.
Innovation Solution
A forming control method that adjusts the forming voltage or pulse width dynamically, incrementing the voltage or width until each resistive random-access memory cell passes a verification action, ensuring all cells in the array can be successfully formed without excessive repetition or time consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional forming control methods are used to perform forming actions on a large number of cells, then the number of formed cells increases, but the leakage current increases and bit line voltage decreases, leading to unsuccessful forming actions
Solution Approach 1:
The patent applies dynamics by making the forming voltage adjustable and adaptive rather than fixed. The control circuit dynamically adjusts the forming voltage based on the number of cells that have already been formed, increasing the voltage for subsequent cells to compensate for decreasing bit line voltage and increasing leakage current, thereby maintaining forming action success rate across large numbers of cells.
Solution Approach 2:
The patent implements feedback through a control circuit that monitors the number of formed cells and uses this information to adjust the forming voltage for subsequent cells. This feedback mechanism allows the system to adapt to the changing electrical conditions (increasing leakage current, decreasing bit line voltage) as more cells are formed, ensuring reliable forming actions throughout the array.
2Reliability
If repeated forming actions are performed to ensure successful formation, then the forming success rate improves, but the time consumption increases excessively
Solution Approach 1:
The patent applies preliminary action by pre-calculating and setting an appropriate initial forming voltage based on the expected number of cells to be formed. The control circuit is configured with knowledge of the total cell count and proactively adjusts the forming voltage sequence to prevent forming failures before they occur, eliminating the need for repeated forming actions and verification cycles.
Solution Approach 2:
The patent changes the forming voltage parameter dynamically based on the number of already-formed cells. By systematically increasing the forming voltage for subsequent cells, the patent ensures each cell receives an appropriate voltage level for successful formation on the first attempt, avoiding the time loss associated with repeated attempts and verification.
3Reliability
If the forming voltage is increased to ensure successful forming actions, then the forming success rate improves, but the risk of damaging the cells increases
Solution Approach 1:
The patent uses dynamics to adjust the forming voltage adaptively rather than using a fixed high voltage. The control circuit increases the forming voltage progressively and only for subsequent cells based on the actual number of formed cells, ensuring each cell receives the minimum necessary voltage for successful formation while avoiding excessive voltage that could cause damage.
Solution Approach 2:
The patent changes the forming voltage parameter in a controlled, progressive manner based on the number of already-formed cells. This systematic parameter adjustment ensures that voltage is increased only when necessary and only to the extent needed to overcome the decreasing bit line voltage and increasing leakage current, minimizing the risk of cell damage while maintaining forming success.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method ensures all resistive random-access memory cells in the array can be successfully formed, reducing the need for repeated forming actions and minimizing time, while maintaining the integrity of the forming process across a large number of cells.
Implementation Method 1
While the forming action is performed, the cluster of oxygen vacancies in the insulation layer 104 forms a conducting filament 108
Implementation Method 2
the conducting filament 108 within the insulation layer 104 is subjected to a redox process
Data Source
AI summary
A forming control method for a resistive random-access memory cell array is provided. While a forming action of the resistive random-access memory cell array is performed, a verification action is performed to judge whether the forming action on the resistive random-access memory cells has been successfully done. By properly changing a forming voltage or a pulse width, the forming actions on all of the resistive random-access memory cells of the resistive random-access memory cell array can be successfully done.