Redundant IC Pad Routing for Large Defect Compensation
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Solution Overview
Problem
Existing techniques for repairing manufacturing defects in integrated circuit dies that affect external conductive pads are inefficient in handling large defects, leading to significant yield loss and increased physical design complexity.
Innovation Solution
Incorporating redundant external conductive pads and circuitry that shifts input/output signals to these pads to compensate for disabled pads, allowing for scalable redundancy and reduced repair overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional repair techniques are used for manufacturing defects affecting external conductive pads, then some defect repair capability is provided, but yield loss is significant and physical design complexity increases for large defects
Solution Approach 1:
The patent applies preliminary action by pre-configuring repair groups with redundant pads and multiplexer circuits before manufacturing defects occur. The repair architecture is built in advance during IC design, allowing rapid defect compensation without complex post-manufacturing design modifications. This pre-established structure enables quick yield recovery by simply reconfiguring existing repair groups rather than redesigning repair solutions for each defect scenario.
Solution Approach 2:
The patent segments the external conductive pads into multiple repair groups, where each group contains primary pads and redundant pads with dedicated repair circuitry. This segmentation allows defects to be contained within specific repair groups rather than affecting the entire pad array. Each repair group can be independently configured to compensate for defects, reducing the overall impact on yield and simplifying the repair management complexity.
2Reliability
If redundant pads are added to compensate for defects, then defect tolerance improves, but area overhead increases
Solution Approach 1:
The patent implements universality by designing repair groups where redundant pads and repair circuitry serve multiple functions. The same repair group structure can compensate for defects in any pad within that group, and the multiplexer circuits can route signals dynamically based on which pads are functional. This multi-functional design allows a single set of redundant resources to protect against multiple potential defect scenarios, reducing the total area overhead compared to dedicated redundancy for each pad.
Solution Approach 2:
The patent merges the repair functionality into the existing pad structure by integrating multiplexer circuits and repair logic within repair groups. Instead of adding completely separate redundant pad arrays, the repair capability is combined with the primary pad function through shared circuitry and control logic. This merging approach achieves defect tolerance while minimizing area overhead by utilizing common resources across multiple pads within each repair group.
3Reliability
If complex repair architectures are implemented to handle large defects, then defect coverage improves, but physical design complexity increases
Solution Approach 1:
The patent reduces physical design complexity by segmenting the pad array into manageable repair groups with standardized structures. Each repair group follows a template design containing primary pads, redundant pads, and multiplexer circuits, which can be systematically instantiated across the IC. This segmentation transforms a potentially complex global repair problem into multiple simpler, identical local repair units, significantly reducing the overall physical design complexity while maintaining comprehensive defect coverage.
Solution Approach 2:
The patent applies preliminary action by establishing a standardized repair group template during the initial IC design phase. This pre-configured template includes all necessary repair circuitry and control logic, eliminating the need for complex custom repair architecture design for each defect scenario. The preliminary establishment of this modular template allows rapid deployment of defect coverage through simple replication and configuration rather than complex custom design work.
Data Source
AI summary
An integrated circuit includes first external conductive pads, second external conductive pads, and third external conductive pads. The second external conductive pads are between the first external conductive pads and the third external conductive pads. Repair group circuitry is configurable to shift signal transmission away from one of the first external conductive pads to one of the third external conductive pads if the one of the first external conductive pads has a defect.