Semiconductor Defect Detection Circuit Using Segmented Capacitance
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Solution Overview
Problem
During the manufacturing process of semiconductor packages, defects such as cracks can occur on the periphery of semiconductor dies or on bonding pads, which can affect the reliability of the semiconductor package. Existing technologies lack effective methods for detecting these defects in advance.
Innovation Solution
A circuit for detecting defects is introduced, which includes a defect detection conductor in the peripheral region of a semiconductor die, input and output pads connected to the conductor, a defect detection assembly with a reference voltage supply, reference capacitor, switching assembly, and detection capacitors, and a controller to control the operations of the defect detection assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a defect detection circuit is added to the semiconductor package, then the ability to detect defects is improved, but the device complexity increases
Solution Approach 1:
The defect detection conductor is divided into multiple segments with different capacitance values, allowing the detection circuit to identify defect positions by measuring capacitance variations. This segmentation enables precise defect localization without requiring complex imaging or scanning systems.
Solution Approach 2:
The defect detection conductor serves multiple functions: it acts as both a structural element of the semiconductor package and a sensing element for defect detection. The same conductor that provides electrical connection also enables capacitance-based defect detection, eliminating the need for separate dedicated sensing structures.
2Measurement precision
If multiple detection capacitors are added to improve defect position detection accuracy, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Multiple detection capacitors are strategically positioned at different locations along the defect detection conductor. Each capacitor monitors a specific segment, allowing the system to pinpoint defect locations by identifying which capacitor experiences capacitance changes. This segmented approach provides precise spatial resolution.
Solution Approach 2:
The detection system transitions from simple presence/absence detection to position-specific detection by adding the spatial dimension through multiple capacitors. The capacitance measurements from different capacitor positions create a spatial map that identifies where defects occur along the conductor.
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 circuit effectively detects the presence and position of defects in the semiconductor package, thereby enhancing the reliability of the semiconductor package by identifying potential issues before they cause failures.
Implementation Method 1
the defect detection assembly includes a reference voltage supply, a reference capacitor, a switching assembly, and a plurality of detection capacitors
Data Source
AI summary
A circuit for detecting defects includes a defect detection conductor provided in a peripheral region of a semiconductor die, an input pad connected to a first end of the defect detection conductor, an output pad connected to a second end of the defect detection conductor, a defect detection assembly connected to the defect detection conductor and configured to detect a defect of the defect detection conductor, and a controller configured to control operations of the defect detection assembly, where the defect detection assembly includes a reference voltage supply, a reference capacitor, a switching assembly, and a plurality of detection capacitors, and the switching assembly is configured to connect the reference capacitor to one of the reference voltage supply, a position adjacent to the input pad of the defect detection conductor, and a position adjacent to the output pad of the defect detection conductor.