Bi-Stable Circuit for Semiconductor Chip Damage Detection
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Solution Overview
Problem
Semiconductor integrated circuits are prone to malfunction due to physical damage, such as cracks, during fabrication and operation, which can lead to dangerous situations in safety-critical systems, and existing damage detection methods are not sufficiently robust or reliable.
Innovation Solution
A chip damage detection device utilizing bi-stable circuits with conductive lines that extend through observed areas of the integrated circuit die to detect potential differences and leakage currents, flipping into a second stable state upon damage, allowing for reliable detection of defects like cracks and changes in resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional damage detection methods are used, then detection capability is provided, but reliability and robustness are insufficient
Solution Approach 1:
The bi-stable circuit is pre-configured with a first stable state before operation, and the detection mechanism is prepared in advance to detect transitions to a second stable state. This preliminary setup ensures that the detection system is ready to immediately identify damage conditions without requiring complex real-time analysis, thereby improving both reliability and precision of damage detection.
Solution Approach 2:
The invention implements a feedback mechanism where the bi-stable circuit continuously monitors its own state and provides output signals that reflect the integrity of the observed circuit area. When damage occurs causing a state transition, the feedback output changes accordingly, enabling reliable and precise detection of damage conditions through the circuit's self-monitoring capability.
2Reliability
If bi-stable circuit with conductive lines is used, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The detection functionality is merged into the existing circuit structure by integrating bi-stable circuits with conductive lines that pass through the observed area. This combining approach allows the detection mechanism to utilize the circuit's own structural elements, thereby improving detection reliability without proportionally increasing overall device complexity.
Solution Approach 2:
The bi-stable circuit serves multiple functions: it acts as both a functional circuit element and a damage detection sensor. The conductive lines serve dual purposes as both signal transmission paths and damage detection pathways. This multi-functionality reduces the need for separate dedicated detection structures, thereby limiting the increase in device complexity while maintaining high detection reliability.
3Measurement precision
If conductive lines extend through observed areas, then detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The observed area is divided into multiple segments, each monitored by conductive lines passing through specific regions. This segmentation allows precise localization of damage to particular areas while maintaining manufacturability through modular integration into the standard circuit fabrication process.
Solution Approach 2:
The conductive lines are pre-routed through the observed areas during the standard circuit fabrication process, before the actual circuit operation begins. This preliminary integration into the manufacturing flow ensures precise damage detection capability is built-in from the start without requiring complex post-fabrication modifications or specialized manufacturing steps.
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 provides a robust and reliable method for detecting physical damage in semiconductor ICs, enabling early identification and prevention of malfunctions, especially in safety-critical systems, thereby ensuring operational safety and compliance with safety integrity levels.
Implementation Method 1
A chip damage detection device (10) utilizes at least one bi-stable circuit (12) comprising a first conductive line (14) passing through an observed area (16, 18, 34) of an integrated circuit die (20) for damage monitoring of the observed area (16, 18, 34)
Implementation Method 2
A chip damage detection device (10) utilizes at least one bi-stable circuit (12) comprising a first conductive line (14) passing through an observed area (16, 18, 34) of an integrated circuit die (20) for damage monitoring of the observed area (16, 18, 34)
Data Source
AI summary
A chip damage detection device is provided that includes at least one bi-stable circuit having a first conductive line passing through an observed area of a semiconductor integrated circuit chip for damage monitoring of the observed area. The at least one bi-stable circuit is arranged to flip from a first stable state into a second stable state when a potential difference between a first end and a second end of the first conductive line changes or when a leakage current overdrives a state keeping current at the first conductive line. Further, a semiconductor integrated circuit device that includes the chip damage detection device and a safety critical system that includes the semiconductor integrated circuit device or the chip damage detection circuit is provided.