Bonded Contact Pad Redundancy for Void-Tolerant Signal Transfer
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Solution Overview
Problem
Existing bonded semiconductor structures face issues with voids and debris at the bond interface between contact pads, leading to faulty interconnects, which can compromise electrical connectivity and device yield.
Innovation Solution
Implementing redundant electrical connections and switching circuitry that reroutes signals through alternate paths using multiplexers, demultiplexers, and tri-state drivers to ensure continuous connectivity even when primary connections fail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If direct bonding of contact pads is used to achieve electrical connectivity, then manufacturing simplicity is improved, but reliability deteriorates due to voids and debris at the bond interface
Solution Approach 1:
The patent applies preliminary action by implementing redundancy and switching circuitry before the bonding process occurs. The bonded structure is designed with redundant contact pads and switching circuitry that can detect and reroute around defects before they compromise the entire electrical connection, thus preventing reliability failures in advance while maintaining simple direct bonding processes.
Solution Approach 2:
The patent implements beforehand cushioning by creating a protective redundancy system that cushions against the harmful effects of voids and debris. The switching circuitry and redundant contact pads act as a buffer, allowing the system to absorb bonding defects without losing electrical connectivity, thus protecting the overall reliability while keeping the bonding process simple.
2Reliability
If redundant electrical connections with switching circuitry are implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The switching circuitry is designed with multi-functionality, serving both as a reliability mechanism for detecting and rerouting around defects, and as a normal signal routing component during operation. This universal design reduces the perceived complexity by integrating the redundancy function into the existing circuit architecture rather than adding separate dedicated redundancy systems.
Solution Approach 2:
The switching circuitry implements self-service by automatically detecting defects and rerouting signals without external intervention. The system monitors its own electrical connections and autonomously switches to redundant paths when failures are detected, reducing the need for complex external control mechanisms and simplifying the overall system architecture.
3Reliability
If contact pads are spaced far apart to avoid defect propagation, then reliability is improved, but electrical loss increases
Solution Approach 1:
The patent applies preliminary action by establishing redundant electrical paths before signal transmission occurs. When a defect is detected in a long-distance connection, the switching circuitry proactively switches to an alternative path, preventing energy loss and signal degradation that would otherwise occur in compromised long-distance connections.
Solution Approach 2:
The switching circuitry acts as an intermediary that mediates between the need for long-distance connections (which isolate defects) and the need to minimize electrical loss. By introducing intermediate switching points and redundant paths, the system can maintain long-distance defect isolation while providing alternative shorter or lower-loss routes for signal transmission when needed.
Data Source
AI summary
A bonded structure is disclosed. The bonded structure can include a first element that has a first plurality of contact pads. The first plurality of contact pads includes a first contact pad and a second redundant contact pad. The bonded structure can also include a second element directly bonded to the first element without an intervening adhesive. The second element has a second plurality of contact pads. The second plurality of contact pads includes a third contact pad and a fourth redundant contact pad. The first contact pad is configured to connect to the third contact pad. The second contact pad is configured to connect to the fourth contact pad. The bonded structure can include circuitry that has a first state in which an electrical signal is transferred to the first contact pad and a second state in which the electrical signal is transferred to the second contact pad.