Memory Cell Circuit for Function Activation via Resistive Switching
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Solution Overview
Problem
Existing electronic circuits require significant effort in design and mask generation for permanently deactivating or activating functions, such as transitioning a chip from a fabrication/test mode to a field mode, and there is a need for a more efficient method to manage function states in circuits.
Innovation Solution
The use of memory cells that can be formed and switched between high and low resistive states, allowing a control circuit to determine their formation state and set predefined functions to executable or non-executable states based on matching patterns or minimum fractions of formed or unformed cells, thereby replacing traditional saw-bows or fuses for permanent deactivation or activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If saw-bows are used for permanent deactivation of functions, then function deactivation is achieved, but design complexity and mask generation effort increase
Solution Approach 1:
The patent replaces the mechanical saw-bow cutting system with an electrical resistance-based system using memory cells. Instead of physically cutting circuit traces during singulation, the invention uses memory cells that can be electrically programmed to high or low resistance states to permanently enable or disable functions, eliminating the need for saw-bow mechanisms and associated mask generation complexity
Solution Approach 2:
The invention changes the physical parameter used for function control from mechanical trace continuity to electrical resistance state. Memory cells are programmed by changing their resistance parameter between high (isolated) and low (conductive) states, providing a simpler, more flexible method for permanent function deactivation without requiring complex saw-bow design
2Reliability
If saw-bows are used for mode transition, then fabrication/test mode deactivation is achieved, but manufacturing process complexity increases
Solution Approach 1:
The patent replaces the mechanical singulation-based mode transition with an electrical programming approach. Memory cells are programmed during or after fabrication to establish the desired operational mode, eliminating the need for mechanical saw-bow cutting and simplifying the manufacturing process while ensuring reliable mode transition
Solution Approach 2:
The invention performs the mode selection action in advance by programming memory cells during fabrication or before device operation. This preliminary programming establishes the operational mode (fabrication/test or field mode) before the device is fully assembled or deployed, simplifying the overall manufacturing process compared to post-singulation saw-bow operations
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 enables efficient and secure permanent activation or deactivation of functions by leveraging the resistive switching properties of memory cells, enhancing security and reducing design complexity, while allowing for flexible access control and function management.
Implementation Method 1
the formed memory cell is repeatedly switchable between a state of low electrical resistivity and a state of high electrical resistivity
Data Source
AI summary
In various embodiments. an electronic circuit is provided. The electronic circuit may include at least one memory cell and a control circuit configured to determine a formation state of the at least one memory cell and set a predefined function to a predefined state of executability (e.g., enabled or disabled) based on the determined formation states. For example, the predefined function may be set to the predefined state of executability only if the determined formation states of two or more memory cells match a predefined formation state pattern, or only if a minimum number or fraction of two or memory cells are in a predefined formation state. The formation state is either unformed or formed, wherein the unformed state is an electrically isolated state, and the formed state is a state into which an initially unformed memory cell is transformable and in which the formed memory cell is repeatedly switchable between a state of low electrical resistivity and a state of high electrical resistivity.