Ring Oscillator Test Circuits for IC Counterfeit Detection
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Solution Overview
Problem
The integration circuit (IC) manufacturing industry faces challenges in ensuring supply chain integrity due to counterfeiting and subversion, where counterfeit ICs may be misrepresented as being fabricated at a certain facility but are actually produced by another, potentially of lower quality or with malicious modifications, and existing detection methods are expensive, time-consuming, and prone to false negatives.
Innovation Solution
Incorporating a test circuit within the IC, comprising ring oscillator circuits and a switching circuit, which emits output signals when energized, allowing for the generation of unique signatures that can be compared to determine if the IC was fabricated at the same facility as a standard IC, thereby identifying potential counterfeits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing detection methods (holograms, TEM, X-ray inspection) are used to detect counterfeit ICs, then detection capability is provided, but the methods are expensive, time-consuming and may generate false negatives
Solution Approach 1:
The patent applies preliminary action by embedding test circuits and unique identifiers into the IC during the original fabrication process. This allows authenticity verification to be performed quickly later by simply reading the pre-encoded identifier, rather than conducting time-consuming inspection procedures at the time of detection.
Solution Approach 2:
The patent uses copying by creating a digital replica or hash of the IC's unique identifier during fabrication and storing it for later comparison. This allows rapid verification by comparing the current reading against the stored copy, avoiding the need for complex physical inspection methods.
2Reliability
If existing detection methods (holograms, TEM, X-ray inspection) are used to detect counterfeit ICs, then detection capability is provided, but these methods are expensive
Solution Approach 1:
The patent employs a low-cost identification mechanism embedded during fabrication that can be read repeatedly without degradation. This disposable-like approach replaces expensive, resource-intensive inspection methods with a simple, inexpensive verification process that consumes minimal energy and resources.
Solution Approach 2:
By creating and storing a digital copy of the IC's unique identifier during fabrication, the system enables inexpensive verification through digital comparison rather than costly physical inspection methods like TEM or X-ray analysis.
3Reliability
If test circuits are integrated into the IC to enable authenticity verification, then counterfeit detection capability is improved, but the IC design complexity increases
Solution Approach 1:
The patent applies segmentation by separating the IC into functional components: the main operational circuitry and the embedded test/identification circuitry. This modular approach allows the authentication function to be added as a distinct segment without fundamentally redesigning the entire IC architecture.
Solution Approach 2:
The test circuits embedded in the IC serve multiple functions: they act as both test structures for manufacturing verification and as permanent identification elements for authenticity verification. This multi-functionality reduces the need for separate dedicated authentication components.
Data Source
AI summary
Described herein are various technologies pertaining to identifying counterfeit integrated circuits (ICs) by way of allowing the origin of fabrication to be verified. An IC comprises a main circuit and a test circuit that is independent of the main circuit. The test circuit comprises at least one ring oscillator (RO) signal that, when energized, is configured to output a signal that is indicative of a semiconductor fabrication facility where the IC was manufactured.