Memory Array With Dual Filament Switches for PUF Reliability
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Solution Overview
Problem
Existing physical unclonable function (PUF) memory technologies face challenges in achieving a 50% probability of producing 0 or 1, and lack flexible operation modes, which limits their application in secure digital ID cards and other applications.
Innovation Solution
A memory array configuration with conductive filament components and switch circuits, allowing for both differential and single-ended operation modes, where each memory cell has a 50% success probability of forming a conductive filament, enabling flexible and reliable PUF applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PUF memory configurations are used, then device mismatch behavior can be avoided, but achieving 50% probability of producing 0 or 1 becomes difficult
Solution Approach 1:
The memory cell is divided into two independent conductive filament components (first and second conductive filament components), each capable of forming independently. This segmentation allows each component to have an independent 50% formation probability, ensuring that exactly one forms successfully and achieving the required 50% success probability for PUF applications.
Solution Approach 2:
The patent changes the formation mechanism parameter by using voltage-controlled conductive filament formation. By applying specific voltage conditions during the forming process, the patent ensures that only one of the two conductive filament components forms successfully, achieving the desired 50% probability while avoiding device mismatch behaviors.
2Adaptability or versatility
If single-mode operation is used, then device structure is simple, but operational flexibility and adaptability are limited
Solution Approach 1:
The memory array is designed with multi-functionality to support both differential mode and single-ended mode operations using the same basic cell structure. This universality allows the patent to achieve operational flexibility and adaptability without requiring completely different device structures for each operation mode, thus balancing versatility with structural simplicity.
Solution Approach 2:
The patent introduces dynamic operation modes where the same memory array can switch between differential mode and single-ended mode based on application requirements. This dynamic capability allows the system to adapt to different operational needs while maintaining a relatively simple underlying device structure, resolving the contradiction between flexibility and complexity.
3Measurement precision
If differential mode is used, then reading precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the differential mode reading function into the existing memory cell structure by utilizing the two conductive filament components and their corresponding switch circuits. The differential reading is achieved by comparing currents through both filaments, merging the precision measurement function with the basic storage structure without requiring entirely separate differential measurement devices.
Solution Approach 2:
The switch circuit acts as an intermediary that enables differential mode operation by selectively connecting the conductive filament components to the reading circuitry. This intermediary structure allows the patent to achieve improved reading precision through differential measurement while managing device complexity by using controlled switching rather than permanent complex wiring.
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 memory array provides a 50% success probability for conductive filament formation, enabling robust and flexible operation in PUF applications, enhancing resolution and reliability for secure data storage and identification.
Implementation Method 1
After each of the plurality of memory cells is subject to a filament forming, one of the first and the second conductive filament components is formed to create a conductive filament, and the other is in a high resistance state
Data Source
AI summary
A memory array and its operation method are provided. The array includes plural sets of word lines; plural bit lines; and plural memory cell each arranged at intersection of the plural sets of word lines and the plural bit lines. Each memory cell has first and second conductive filament component and a switch circuit, and one ends of the first and the second conductive filament components are coupled to corresponding bit lines and the other ends thereof are coupled to the switch circuit. In the differential mode, read is performed based on the reading currents of the first and the second conductive filament components. In the single-ended mode, read is performed based on a reference current and a reading current of the first or the second conductive filament component that is formed successfully.