IC Die Crack Detection via Perimeter Conductive Line
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Solution Overview
Problem
Current methods for detecting cracks and delaminations in integrated circuits (ICs) are time-consuming and inefficient, especially in production chips, as they require optical analysis and cannot effectively identify cracks across the entire IC die or in metal layers, leading to delayed diagnosis and reduced yield.
Innovation Solution
A conductive line is placed around the periphery of the IC die that breaks when a crack or delamination occurs, allowing for electrical testing using automated test equipment to quickly diagnose the presence and location of defects, enabling faster corrective actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical inspection methods are used to detect cracks in IC dies, then crack detection capability is provided, but the process becomes time-consuming and requires depackaging
Solution Approach 1:
The patent replaces optical inspection methods with an electrical testing method. A conductive line is integrated into the IC die structure that electrically connects different regions. When a crack occurs, it disrupts the conductive line, creating a detectable electrical open circuit. This electrical detection method eliminates the need for time-consuming optical inspection and depackaging, while maintaining crack detection capability throughout the fabrication process.
2Measurement precision
If guard rings are placed on test dies to detect cracks, then crack detection is enabled, but chip space is consumed and additional processing is required
Solution Approach 1:
The conductive line serves multiple functions: it acts as both a functional interconnect within the IC circuitry and as a crack detection sensor. By integrating the detection function into existing necessary circuit elements rather than adding separate guard ring structures, the patent eliminates additional processing steps and conserves chip space while maintaining crack detection capability across the entire die.
3Measurement precision
If traditional detection methods are used, then cracks can be detected, but the cause determination requires expensive optical analysis on large numbers of failed units
Solution Approach 1:
The conductive line is divided into multiple segments or zones along its path across the die. Each segment can be independently tested to determine which specific region contains the crack. This segmentation allows rapid localization of defects without requiring expensive optical analysis of entire failed units, enabling efficient cause determination and reducing information loss during diagnosis.
Data Source
AI summary
A structure and method is utilized to detect cracks, fissures, fractures, or other dislocations in an IC die. A conductive line in a metal layer is provided about the periphery of the IC die. A break in the conductive line indicates that the IC die is cracked. A JTAG interface can be utilized to provide an indication of whether the die is cracked.