Correlated Electron Switch for Scalable One-Time and Multi-Time Memory
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Solution Overview
Problem
Current non-volatile memory technologies, such as OTP and MTP memory, face limitations in scalability and reprogrammability, particularly below 40 nanometers, and lack efficient methods for managing multiple programming cycles of Correlated Electron Switch (CES) elements.
Innovation Solution
The implementation of a Correlated Electron Switch (CES) element-based apparatus and method that allows for one-time and multi-time programmability by transitioning between impedance states, using a programming circuit to manage the number of programming cycles and physically modify the CES element when a threshold is reached, enabling both one-time and multi-time programmable memory solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OTP memory uses fuse burning for programming, then data storage is permanent and reliable, but the memory cannot be reprogrammed or modified
Solution Approach 1:
The patent applies dynamics by making the memory system adaptable between different programming modes. The CES-based memory can dynamically switch between one-time programming mode (for high reliability) and multi-time programming mode (for reprogrammability), allowing the system to adapt its behavior based on application requirements rather than being fixed in one state.
Solution Approach 2:
The invention achieves universality by creating a memory system that can function as both OTP and MTP memory using the same CES technology platform. The system provides multi-functionality through configurable programming modes, enabling a single memory device to serve multiple purposes - permanent storage when reliability is paramount and reprogrammable storage when adaptability is needed.
2Adaptability or versatility
If MTP memory allows reprogramming, then adaptability and re-usability are improved, but scalability below 40 nanometers becomes difficult
Solution Approach 1:
The patent replaces traditional mechanical/physical programming mechanisms (like fuse burning in OTP or complex charge trapping in Flash) with a novel CES-based electrical switching mechanism. This substitution enables scaling to smaller dimensions below 40 nanometers while maintaining reprogrammability, as the CES mechanism operates effectively at nanoscale dimensions where conventional methods fail.
Solution Approach 2:
The invention utilizes parameter changes in the CES material properties to achieve scalable memory operation. By controlling electrical parameters (voltage, current) applied to the CES element, the system can program and reprogram memory cells at nanoscale dimensions, overcoming the physical limitations that prevent further scaling of traditional MTP memory technologies.
3Reliability
If CES element is programmed by physically modifying the element, then programming reliability is improved, but the element cannot be reprogrammed beyond a threshold number of times
Solution Approach 1:
The system applies dynamics by enabling the CES element to transition between different programming states - initially allowing repeated programming cycles for reprogrammability, and then transitioning to a physically modified state that provides permanent, reliable storage. This dynamic behavior allows the memory to adapt its programming characteristics based on the number of cycles performed.
Solution Approach 2:
The patent applies preliminary action by implementing a threshold mechanism that monitors the number of programming cycles. When the threshold is reached, the system automatically transitions to physical modification mode, preventing further reprogramming attempts. This preliminary setup ensures that the element maintains reprogrammability for a controlled number of cycles while guaranteeing eventual permanent storage reliability.
4Reliability
If a threshold mechanism is implemented to control programming cycles, then unintended rewrites are prevented, but additional circuit complexity is introduced
Solution Approach 1:
The patent implements feedback by using the CES element itself to monitor and track the number of programming cycles. The threshold mechanism reads the state of the CES element to determine how many programming operations have been performed, and provides feedback control to prevent further programming when the threshold is reached. This self-monitoring approach prevents unintended rewrites while managing complexity through intelligent control rather than additional hardware.
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 approach provides scalable non-volatile memory solutions that can efficiently manage multiple programming cycles, preventing unintended rewrites and enabling both one-time and multi-time programmable capabilities, addressing the limitations of existing technologies in terms of scalability and reprogrammability.
Implementation Method 1
The CES element may be programmed to one of a plurality of impedance states
Data Source
AI summary
An apparatus including a Correlated Electron Switch (CES) element and a programing circuit is provided. The programing circuit provides a programing signal to the CES element to program the CES element to an impedance state of multiple impedance states when a number of times the CES element has been programed is less than a threshold.