Anisotropic Conductive Adhesive for IC Random Number Generation
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Solution Overview
Problem
Current methods for assigning random numbers to integrated circuits (ICs) in electronic devices face challenges related to programming speed, manufacturing complexity, physical size, and cost, particularly in high-volume production of low-cost ICs.
Innovation Solution
An electronic device is designed with a substrate and an integrated circuit separated by an anisotropic conductive adhesive layer containing a random distribution of conductive elements, where memory contacts are connected or insulated based on the spatial distribution of these elements, allowing for the generation and storage of a unique random number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random numbers are assigned using external generation and OTP ROM programming, then global uniqueness and reliability are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent enables the IC to self-generate its unique identifier during the manufacturing process. The random number is generated by inherent physical variations in the semiconductor fabrication process itself, eliminating the need for external random number generation equipment and OTP ROM programming facilities. Each IC automatically acquires its unique ID through the natural stochastic variations in transistor threshold voltages or other physical parameters during standard fabrication.
Solution Approach 2:
The patent extracts the random number generation function from external manufacturing equipment and embeds it directly into the IC fabrication process. By utilizing intrinsic physical variations that occur during standard semiconductor manufacturing, the system removes the need for separate random number generation and programming steps, thereby reducing manufacturing complexity while maintaining global uniqueness.
2Reliability
If OTP ROM programming is used to store random numbers, then unique identification is achieved, but programming speed and productivity decrease
Solution Approach 1:
The patent performs random number generation as a preliminary action that occurs naturally during the standard semiconductor fabrication process, before the IC is completed and tested. The unique identifier is established during the manufacturing process itself through controlled random variations in physical parameters, eliminating the need for subsequent programming steps and enabling high-speed production.
Solution Approach 2:
The IC fabrication process itself serves to generate and establish the unique identifier without requiring external programming equipment or additional processing steps. The random variations inherent in the fabrication process automatically create the unique identification, enabling continuous high-speed manufacturing without interruption for programming operations.
3Reliability
If external random number generation and OTP programming are implemented, then secure identification is improved, but physical size and cost increase
Solution Approach 1:
The patent merges the random number generation function with the standard IC fabrication process. By combining the security feature generation with the existing manufacturing流程, the system eliminates the need for separate OTP ROM structures and external programming equipment, thereby reducing the physical footprint of the IC while maintaining secure identification capabilities.
Solution Approach 2:
The patent extracts the security feature generation from separate hardware components and embeds it directly into the fabrication process itself. By utilizing intrinsic physical variations during manufacturing, the system removes the need for dedicated OTP ROM memory structures, reducing the overall IC area while preserving secure identification functionality.
4Reliability
If OTP ROM structures are used for random number storage, then unique identification is achieved, but manufacturing cost increases
Solution Approach 1:
The patent enables the fabrication process to self-generate unique identifiers using inherent physical variations, eliminating the need for expensive external random number generation equipment and OTP ROM programming facilities. This approach leverages the existing manufacturing infrastructure to produce secure unique IDs at no additional cost per device.
Solution Approach 2:
The patent extracts the costly OTP ROM programming step from the manufacturing process and replaces it with intrinsic physical variations that occur during standard fabrication. By removing the need for specialized programming equipment and additional processing steps, the system significantly reduces manufacturing costs while maintaining unique identification reliability.
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 method efficiently generates unique random numbers with high entropy, reducing manufacturing complexity and cost while maintaining stability under varying conditions, suitable for high-volume production of ICs.
Implementation Method 1
a layer, provided between the substrate and the electronic circuit, wherein the layer comprises an electrically insulating medium containing a spatial distribution of conductive elements that is at least partially random, whereby the layer is conductive through the thickness of the layer at locations where a conductive element extends through the thickness of the layer, and whereby the layer is non-conductive at locations where no conductive element extends through the thickness of the layer
Data Source
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Figure 3(a)~3(b)
AI summary
An electronic device is disclosed that comprises a substrate and an electronic circuit with a layer between them. The layer comprises an electrically insulating medium containing a spatial distribution of conductive elements. The electronic circuit comprises memory contacts arranged for electrical connection to a corresponding contact on the substrate when at least one of the conductive element forms a connection between a memory contact and the corresponding contact but for electrical insulation from the corresponding contact when no conductive elements forms such a connection. A selection of the memory contacts, that is at least partially random, is thus electrically connected to the corresponding contact on the substrate. Memory circuitry is configured to store a representation of a respective electrical connection status of the memory contacts.