Semiconductor Test Circuit for In-Situ Interconnect Resistance Detection
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Solution Overview
Problem
Modern semiconductor devices face challenges in detecting and locating degraded interconnect and semiconductor structures due to small resistance variations, which are difficult to measure accurately using existing testing methods, leading to inefficiencies in yield analysis and maintenance.
Innovation Solution
A circuit is employed for testing conductive structures within integrated circuits, utilizing a signal source, multiplexer, switches, and analog-to-digital converter (ADC) to measure voltage differences, allowing for improved resistance resolution and in-situ monitoring of interconnect and semiconductor structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing testing methods are used to measure resistance variations in interconnect structures, then the testing process is simple, but the measurement precision is insufficient to detect small resistance variations accurately
Solution Approach 1:
The patent divides the testing circuit into modular functional blocks: a signal source for generating test signals, a multiplexer for selecting conductive structures, switches for connecting test signals to specific structures, and an ADC for converting voltage signals to digital data. This segmentation allows each component to be optimized independently while achieving high measurement precision through coordinated operation of these modular segments.
Solution Approach 2:
The patent introduces an intermediary voltage measurement approach where the ADC converts voltage differences across conductive structures into digital readings. This intermediary conversion process enables precise resistance measurement by transforming difficult-to-measure resistance values into easier-to-measure voltage values, thereby achieving high resolution without requiring complex direct resistance measurement circuitry.
2Quantity of substance
If repeated reductions in minimum feature size are implemented to increase integration density, then more components can be integrated into a given area, but detecting and locating degraded structures becomes more difficult
Solution Approach 1:
The patent transitions from traditional single-point resistance measurement to a distributed measurement approach across multiple conductive structures. By using the multiplexer to sequentially access different structures and the ADC to capture voltage differences at multiple points, the system creates a dimensional expansion of measurement capability, allowing detection of degraded structures even as feature sizes shrink and integration density increases.
Solution Approach 2:
The patent implements feedback through the ADC's digital output that provides resistance information about the tested conductive structure. This feedback mechanism enables continuous monitoring and detection of degradation, allowing the system to identify and locate problematic structures in real-time even within high-density integrated circuits where traditional measurement methods fail.
3Speed
If advanced packaging techniques are adopted to meet demand for miniaturization and higher speed, then performance requirements are improved, but the complexity of testing and monitoring increases
Solution Approach 1:
The patent designs a universal testing circuit that can monitor multiple types of conductive structures (interconnects, semiconductor structures, etc.) through a single integrated system. The multiplexer enables the same basic circuit architecture to test different structures sequentially, providing multi-functionality that reduces overall system complexity while maintaining the ability to test advanced high-speed packaging configurations.
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 enables precise detection of degraded structures, enhancing yield analysis and maintenance by providing improved resistance resolution and enabling in-situ testing of interconnect and semiconductor structures.
Implementation Method 1
analog-to-digital converter (ADC) configured to provide a digital output based on comparing the test voltage with a reference voltage
Data Source
AI summary
A circuit includes a signal source configured to provide a test signal to at least one of a plurality of conductive structures based on a decoded signal, a plurality of switches configured to connect the signal source to the plurality of conductive structures, respectively, based on the decoded signal, a multiplexer configured to select a test voltage present on the at least one conductive structure, based on the decoded signal, and an analog-to-digital converter (ADC) configured to provide a digital output based on comparing the test voltage with a reference voltage.