Switch Element with Dual-Mode Reset for Resistance Change Stability
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Solution Overview
Problem
Resistance change elements used in programmable logic integrated circuits can experience defective operations during reset, leading to erroneous connections and increased standby power, which existing technologies fail to adequately address.
Innovation Solution
A switch element comprising a resistance change element, a first transistor, and a second transistor, with specific modes of operation that control the gate voltage and potential difference between electrodes to stabilize the transition from a low-resistive to a high-resistive state, incorporating a metal deposition type resistance change film and electrodes connected to the transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a resistance change element is used to enable reconfiguration after manufacturing, then adaptability is improved, but reliability deteriorates due to defective reset operations
Solution Approach 1:
The patent implements two distinct reset modes (first mode with lower gate voltage and smaller potential difference, second mode with higher gate voltage and larger potential difference) that can be dynamically selected based on the operational state. This dynamic approach allows the system to adapt the reset strategy to prevent defective operations while maintaining reconfiguration capability.
Solution Approach 2:
The patent changes operational parameters (gate voltage and potential difference between electrodes) to define two different reset modes. By adjusting these parameters, the system can switch between a first reset mode for normal operations and a second reset mode for correcting defective states, thereby improving reliability without sacrificing adaptability.
2Reliability
If higher gate voltage and larger potential difference are used for reset, then transition to high-resistive state is improved, but harmful factors increase due to defective operations
Solution Approach 1:
The system dynamically selects between two reset modes based on the current state. The first mode uses moderate parameters for normal transitions, while the second mode uses higher parameters specifically for correcting defective operations, thereby achieving reliable transitions without consistently generating harmful effects.
Solution Approach 2:
By defining two sets of parameters (first gate voltage < second gate voltage, and first potential difference < second potential difference), the patent enables controlled variation of electrical parameters to achieve reliable state transitions while minimizing harmful effects through selective mode usage.
3Device complexity
If memory elements are formed in the same layer as transistors, then integration is improved, but area increases leading to reduced power performance
Solution Approach 1:
The patent forms the resistance change element (memory function) in the interconnect layer rather than in the same layer as the transistor, utilizing the vertical dimension and available interconnect space. This dimensional separation maintains high integration while reducing the area occupied by memory elements, thereby improving power performance ratio.
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 solution stabilizes the transition from a low-resistive to a high-resistive state, reducing defective operations and associated power consumption, thereby enhancing the reliability and efficiency of the switch element.
Implementation Method 1
The solid electrolyte is supplied with a metal ion from the first electrode, and not from the second electrode. The metal ion is deposited as a metal by movement and electrochemical reaction in the solid electrolyte.
Implementation Method 2
a metal of the first electrode becomes a metal ion and is dissolved into the solid electrolyte. The metal ion is deposited as a metal by movement and electrochemical reaction in the solid electrolyte
Implementation Method 3
The metal ion is deposited as a metal by movement and electrochemical reaction in the solid electrolyte. The deposited metal becomes a metal crosslink (also referred to as a filament or a conductive path) connecting the first electrode and the second electrode
Implementation Method 4
The deposited metal becomes a metal crosslink (also referred to as a filament or a conductive path) connecting the first electrode and the second electrode, and therefore the resistance change element becomes a low-resistive state (ON). Further, when this metal crosslink disappears, the resistance change element becomes a high-resistive state (OFF).
Data Source
AI summary
This switch element includes a resistance change element, a first transistor, and a second transistor. The resistance change element includes: a metal deposition type resistance change film; a first electrode; and a second electrode. To the second electrode, a source or a drain of the second transistor is connected. The switch element has a first mode and a second mode, when a potential of the second electrode is made higher than that of the first electrode and the resistance change element is switched from the low resistance state to the high resistance state. The gate voltage is greater in the first mode than in the second mode, and a potential difference between the first and second electrodes is smaller in the first mode than in the second mode.