Resistance Change Memory Stabilization via Non-Ohmic Element
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Solution Overview
Problem
Resistance change type memory technologies face challenges in reliably switching the resistance state of storage elements due to issues with voltage polarity, current control, and heat management, leading to instability and errors in data storage operations.
Innovation Solution
A resistance change type memory configuration that includes a series circuit with a non-ohmic element and a capacitance circuit, where the capacitance circuit is connected to the word line and includes a capacitive element to stabilize the resistance state transition by adjusting the potential difference and preventing immediate return to a low-resistance state after switching to a high-resistance state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a resistance change type storage element is used to enable electrical rewriting of data, then data storage capability is improved, but operational reliability deteriorates due to instability in resistance state transitions
Solution Approach 1:
A non-ohmic element is introduced as an intermediary component in series with the resistance change type storage element. This non-ohmic element acts as a mediator that controls and stabilizes the current flow during resistance state transitions, preventing direct control issues from affecting the storage element and thereby improving operational reliability while maintaining data storage capability
Solution Approach 2:
The invention utilizes the voltage-dependent conductivity characteristics of the non-ohmic element to dynamically change the electrical parameters in the circuit. By leveraging the non-ohmic element's property of having different conductivity in different voltage directions, the system achieves stable resistance state transitions and prevents erroneous switching, thus resolving the reliability issue
2Productivity
If voltage polarity is changed to switch between high-resistance and low-resistance states in bipolar type operation, then data rewriting capability is improved, but stability deteriorates due to difficulty in controlling voltage polarity and timing
Solution Approach 1:
The non-ohmic element serves as a mediator that automatically responds to voltage polarity changes through its inherent asymmetric conductivity properties. This eliminates the need for complex external control mechanisms to manage voltage polarity timing, while the series connection configuration ensures that the non-ohmic element's rectifying action stabilizes the resistance state transitions, simultaneously achieving high productivity and stability
3Adaptability or versatility
If current value and pulse width are controlled to switch resistance states in unipolar type operation, then operational flexibility is improved, but reliability deteriorates due to difficulty in precise control
Solution Approach 1:
The non-ohmic element acts as a natural current regulator and timing reference. Its asymmetric conductivity characteristic inherently limits and shapes the current flow during unipolar operation, providing automatic feedback that stabilizes the resistance state transitions. This intermediary action reduces sensitivity to precise control parameters while maintaining operational flexibility
Solution Approach 2:
The non-ohmic element provides self-regulating behavior through its intrinsic voltage-dependent conductivity. During unipolar operation, the element automatically adjusts its resistance based on the applied voltage, creating a self-limiting effect that stabilizes the switching process without requiring external intervention, thereby improving switching reliability while preserving operational flexibility
4Speed
If Joule heat from capacitive element discharge is used to erase data, then erasing speed is improved, but harmful effects increase due to excessive heat generation
Solution Approach 1:
The non-ohmic element positioned in series with the storage element acts as a thermal and electrical mediator during capacitive discharge. Its asymmetric conductivity properties naturally limit the discharge current magnitude and duration, allowing rapid data erasure through Joule heating while preventing excessive heat generation that could damage the storage element or surrounding structures
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 configuration improves operational reliability by stabilizing the resistance state transition and preventing writing errors, ensuring accurate data storage and retrieval in resistance change type memory devices.
Implementation Method 1
a non-ohmic element which is more conductive in a first to second wiring direction than in a second to first direction
Implementation Method 2
a resistance change type storage element in which data is stored according to a change of a resistance state
Implementation Method 3
a capacitance circuit which includes a capacitive element and is connected to the second wiring
Implementation Method 4
the data stored in the resistance change type storage element is erased by utilizing Joule heat generated by a discharge current of the capacitive element
Data Source
AI summary
A resistance change type memory of an aspect of the present invention including a first wiring configured to extend in a first direction, a second wiring configured to extend in a second direction crossing the first direction, a series circuit configured to connect to the first and second wirings, the series circuit including a non-ohmic element being more conductive in the first to second wiring direction than in the second to first direction and a resistance change type storage element in which data is stored according to a change of a resistance state, an energy supplying circuit configured to connect to the first wiring to supply energy to the first wiring, the energy being used to store the data in the resistance change type storage element, and a capacitance circuit configured to include a capacitive element and being connected to the second wiring.