Semiconductor Substrate Indentation for Fracture Detection
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Solution Overview
Problem
Existing semiconductor chips face challenges in reliably detecting substrate fractures, which can lead to restricted or total failure of electronic systems, especially under mechanical loading, making it difficult to identify and mitigate the effects of such fractures within the system.
Innovation Solution
Incorporating an indentation in the substrate with a conductor track and crossover, allowing for the injection of a test signal to detect substrate fractures by monitoring changes in conductivity, and providing redundant output components to ensure continued functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If substrate fracture detection techniques are implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The conductor track itself serves as the detection element by utilizing its own electrical conductivity properties. The track automatically indicates substrate fracture through changes in its electrical characteristics when crossed by the indentation, eliminating the need for separate detection sensors or complex monitoring systems.
Solution Approach 2:
The patent replaces potential mechanical fracture detection methods with an electrical detection approach. By using electrical conductivity measurement of the conductor track, the system substitutes mechanical sensing with electrical field-based detection, simplifying the overall detection mechanism.
2Reliability
If redundant components are provided for fail-safety, then reliability is improved, but device complexity increases
Solution Approach 1:
The redundant output components are prepared in advance and can be activated upon detection of substrate fracture. The system pre-configures alternative signal paths and output components that remain standby until needed, allowing rapid failover without requiring complex real-time decision-making or switching mechanisms.
3Ease of manufacture
If the semiconductor chip is subjected to mechanical loading during overmolding, then manufacturing process is completed, but substrate fracture occurs
Solution Approach 1:
The indentation in the substrate acts as a predetermined stress relief feature that absorbs and distributes mechanical loads during the overmolding process. By creating this localized depression beforehand, the substrate is pre-conditioned to handle the mechanical stresses of manufacturing without fracturing, as the indentation provides a compliance zone that cushions impact forces.
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
Enables reliable detection of substrate fractures, reduces the impact on integrated circuit functionality, and allows for targeted safeguard measures such as switching to redundant components, thereby enhancing fail-safety and preventing safety deficiencies.
Implementation Method 1
a conductor track (121) and a crossover between the indentation (110) of the substrate and the conductor track (121)... enabling detection of the test signal at the second end of the conductor track
Data Source
AI summary
A method including feeding a test signal into a first end of a conductor track of a semiconductor chip, wherein the conductor track crosses an indentation of a substrate of the semiconductor chip; and detecting the test signal at a second ends of the conductor track, which wherein the detected test signal is indicative of fracture of the substrate of the semiconductor chip at the indentation.