Compliant Bridge Chip for Proximity Communication Alignment
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Solution Overview
Problem
Traditional methods for achieving proximity communication between semiconductor chips face challenges in aligning and maintaining the necessary proximity due to the rigidity and temperature variations of chips, which affects the efficiency and reliability of capacitive coupling.
Innovation Solution
The creation of compliant bridge chips with predetermined flexibility, achieved through thinning and planarization, allows for precise alignment and mechanical compliance, enabling reliable proximity communication by bonding active faces of bridge and island chips with optional etched portions for alignment and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If chips are made rigid for structural stability, then manufacturing and handling become easier, but alignment and maintenance of proximity communication become difficult due to thermal expansion and mechanical stress
Solution Approach 1:
The patent introduces a thin film layer (such as a stress compensation layer or compliant substrate) between the chips to provide flexibility while maintaining structural integrity. This thin film allows the chip assembly to accommodate thermal expansion and mechanical stress without compromising alignment precision, thereby resolving the contradiction between structural stability and alignment precision.
Solution Approach 2:
The patent employs stress compensation techniques that involve changing physical parameters such as thermal expansion coefficients or mechanical stress distribution through specialized materials or结构设计. By adjusting these parameters, the system maintains both structural stability and alignment precision under varying operating conditions.
2Reliability
If chip thickness is reduced to improve compliance and alignment, then proximity communication efficiency improves, but chip handling and bonding become more difficult
Solution Approach 1:
The patent uses thin film structures that provide the necessary compliance for high-quality proximity communication while maintaining sufficient mechanical strength for handling and bonding. The thin film acts as a compliant interface that enables precise alignment without requiring the entire chip to be excessively thin.
Solution Approach 2:
The patent segments the chip structure into different functional layers with different thicknesses and mechanical properties. The active communication face is made thin for compliance, while other structural layers maintain sufficient thickness for handling and bonding, thus resolving the contradiction between communication reliability and handling ease.
3Ease of manufacture
If traditional wire-bonding or ball-bonding is used for off-chip communication, then manufacturing is simpler, but signal density and bandwidth are insufficient to utilize on-chip computational resources
Solution Approach 1:
The patent replaces traditional mechanical wire-bonding or ball-bonding systems with a proximity communication system that uses capacitive coupling between closely spaced chip faces. This substitution eliminates the need for physical wire connections while achieving much higher signal density and bandwidth, thereby resolving the contradiction between manufacturing simplicity and communication productivity.
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
This solution enhances the alignment and communication efficiency between chips, reducing power consumption and latency while maintaining chip separation, and allows for easier handling and bonding of thin chips, addressing the limitations of existing rigid, non-compliant chip structures.
Implementation Method 1
A new technique referred to as 'proximity communication' overcomes the limitations of resistive wires by using capacitive coupling to provide communications between chips that are oriented face-to-face.
Implementation Method 2
an identified portion of the active face of the bridge chip is thinned via etching and is removed by planarizing the back face of the bridge chip, thereby creating an opening in the bridge chip that exposes a portion of the active face of the base chip.
Data Source
AI summary
One embodiment of the present invention provides a system for facilitating proximity communication between semiconductor chips. The system includes a base chip and a bridge chip, each of which includes an active face upon which active circuitry and signal pads reside, and a back face opposite the active face. The active face of the bridge chip is bonded to the active face of the base chip. Then, an identified portion of the active face of the bridge chip is thinned via etching and is removed by planarizing the back face of the bridge chip, thereby creating an opening in the bridge chip that exposes a portion of the active face of the base chip.