Variable Resistance Memory Stabilization via Additional Voltage Pulses
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Solution Overview
Problem
Conventional non-volatile storage devices using variable resistance elements have short data retention periods, requiring frequent data migration and incurring significant costs, and are unable to store logic information for extended periods without degradation.
Innovation Solution
A non-volatile storage device and driving method that utilize a variable resistance element with a voltage pulse application circuit and control circuit to apply additional voltage pulses of higher energy than normal pulses, depending on the resistance state, to stabilize and extend the storage life of logic information, allowing for long-term storage without migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional voltage pulses are applied to the variable resistance element, then the resistance state can be changed (logic information stored), but the data retention period is short
Solution Approach 1:
The patent applies preliminary actions by performing additional voltage pulse applications after the main resistance change operation. Specifically, after changing the resistance state with a normal voltage pulse, the system applies additional voltage pulses of the same polarity to further stabilize the resistance state before data retention begins, thereby extending the data retention period and improving storage reliability
Solution Approach 2:
The patent employs periodic action through the application of multiple discrete voltage pulses at different stages. The system applies normal voltage pulses for resistance state changes, followed by additional periodic voltage pulses for stabilization, creating a structured temporal sequence of electrical stimuli that enhances both data retention duration and storage stability
2Duration of action of stationary object
If data is stored for extended periods with conventional methods, then storage capacity is maintained, but frequent data migration is required
Solution Approach 1:
The system performs preliminary stabilization actions by applying additional voltage pulses immediately after data writing, preparing the variable resistance element for long-term storage. This preliminary stabilization extends the storage life significantly, reducing the frequency at which data migration operations are needed to maintain data integrity
3Duration of action of moving object
If additional voltage pulses with higher energy are applied, then data retention period is extended, but energy consumption increases
Solution Approach 1:
The patent applies partial excessive action by using normal voltage pulses for the essential resistance state change operation, and then applying additional voltage pulses only when needed for stabilization. The additional pulses use higher energy than normal operations, but are applied selectively rather than continuously, thereby extending data retention while controlling overall energy consumption through targeted rather than exhaustive application
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
The method significantly extends the data retention period of variable resistance elements, enabling storage of logic information for over 10 years with improved stability and reduced need for data migration, thereby reducing costs and enhancing storage reliability.
Implementation Method 1
a variable resistance element which is present between the first electrode and the second electrode and includes a variable resistance layer having a resistance value which changes according to a voltage pulse that is applied between the first electrode and the second electrode
Data Source
AI summary
A non-volatile storage device includes: a first electrode; a second electrode; a variable resistance element including a variable resistance layer having a resistance value which changes according to a voltage pulse applied between the first and second electrodes; a voltage pulse application circuit which applies the voltage pulse between the first and second electrodes; and a control circuit which controls the voltage pulse application circuit. Upon receiving an external instruction, the control circuit: reads a current resistance state of the variable resistance element; and when the current resistance state is the high resistance state, causes the voltage pulse application circuit to apply a first additional voltage pulse having a first polarity between the electrodes; and when the current resistance state is the low resistance state, causes the voltage pulse application circuit to apply, between the electrodes, a second additional voltage pulse having a second polarity different from the first polarity.