Segmented Digital Die Ring for Semiconductor Defect Detection
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Solution Overview
Problem
Detecting defects such as cracks in semiconductor dies is challenging due to the slow and impractical nature of visual inspection, especially in large-scale production, and existing continuous conductive rings require time and power-consuming analog test signals.
Innovation Solution
A segmented digital die ring with a control circuit and multiple test segment circuits, using multiplexers to route feedback signals and generate a digital output indicating defect presence, reducing testing time and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection is used to detect defects in semiconductor dies, then defect detection capability is achieved, but production efficiency deteriorates due to slow inspection speed
Solution Approach 1:
The patent replaces manual visual inspection with an automated electrical testing system. A conductive ring is formed around the perimeter of the die, and a test signal is applied to detect defects through electrical conductivity changes. This substitution of mechanical/visual inspection with electrical measurement achieves both high-speed automated testing and accurate defect detection, resolving the contradiction between production efficiency and measurement precision
Solution Approach 2:
The conductive ring structure enables the die to self-test for defects during the manufacturing process. The ring is integrated into the die structure itself, allowing automated testing equipment to probe the die's electrical characteristics and detect cracks or defects without requiring separate inspection equipment or manual examination, thereby improving both speed and accuracy
2Measurement precision
If continuous conductive ring testing is used to detect defects, then defect detection capability is achieved, but power consumption increases due to time and power-consuming analog test signals
Solution Approach 1:
The continuous conductive ring is divided into multiple discrete segments, each connected to the die through separate probe contact points. This segmentation allows individual segments to be tested independently or in groups, enabling more efficient testing sequences that reduce overall power consumption while maintaining comprehensive defect detection coverage along the entire die perimeter
Solution Approach 2:
The patent transitions from using analog test signals to digital test signals for exciting the conductive ring. Digital signals offer better power efficiency, faster switching characteristics, and easier integration with modern automated testing equipment. This parameter change in the test signal type reduces power consumption while maintaining or improving defect detection accuracy
3Measurement precision
If continuous conductive ring testing is used to detect defects, then defect detection capability is achieved, but die area consumption increases
Solution Approach 1:
By segmenting the conductive ring into discrete sections with spaced-apart connection points, the testing structure utilizes the existing die perimeter more efficiently. The segments can be tested independently, allowing for more compact routing and reducing the overall area required for the testing infrastructure while maintaining comprehensive coverage of the die perimeter for defect detection
Data Source
AI summary
Methods, systems, and devices for testing a die using a segmented digital die ring are described. A segmented digital die ring may include multiple signal line segments, each coupled with a test segment circuit, and a control circuit. A test segment circuit may generate a digital feedback signal that indicates a condition of a respective signal line segment. The control circuit may generate a single output signal, indicative of the condition of the signal line segments. By utilizing digital testing circuitry and a single digital output signal, a layout area of the segmented digital die ring be minimized and a power consumption associated with the testing operation may be reduced.