Inverted Trench Capacitor Stacking for Dense IC Decoupling
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Solution Overview
Problem
The traditional design of trench capacitor arrays, with ports only on the top surface, makes it difficult to stack multiple capacitor arrays efficiently, limiting capacitance density and flexibility in semiconductor devices.
Innovation Solution
A capacitor assembly design featuring arrays of trench capacitors with ports on both top and bottom surfaces, allowing for inverted stacking and electrical coupling between layers, enabling higher capacitance density and efficient stacking of capacitor assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If trench capacitor arrays are designed with ports only on the top surface, then the manufacturing process is simplified, but the ability to stack multiple capacitor arrays efficiently is limited
Solution Approach 1:
The patent transitions from a single-sided (2D) port configuration to a multi-sided (3D) port configuration by adding ports on bottom and side surfaces of the trench capacitor arrays. This dimensional expansion enables vertical stacking and three-dimensional integration of capacitor assemblies, resolving the contradiction between manufacturing simplicity and stacking capability.
Solution Approach 2:
The patent inverts traditional capacitor array orientation by creating arrays that can be stacked vertically with ports accessible from multiple surfaces. Instead of all ports facing upward in a single plane, the inverted stacking approach allows bottom ports of one array to connect to top ports of another array, enabling efficient vertical integration while maintaining manufacturing feasibility.
2Quantity of substance
If multiple capacitor arrays are stacked vertically, then capacitance density is increased, but the structural complexity and fabrication difficulty increase
Solution Approach 1:
The patent divides the capacitor system into multiple discrete arrays, each with standardized port configurations on different surfaces. This segmentation allows independent fabrication of each array followed by systematic stacking, reducing overall structural complexity while achieving high capacitance density through vertical integration.
Solution Approach 2:
The patent creates universal trench capacitor arrays with standardized port configurations that can be stacked in multiple orientations and combined in various configurations. This multi-functionality allows the same basic array structure to serve different capacitance requirements through simple stacking arrangements, reducing the need for complex custom-designed structures.
3Area of stationary object
If trench capacitor arrays are designed for high capacitance per unit area, then space efficiency is improved, but flexibility in placement and integration is reduced
Solution Approach 1:
The patent moves from two-dimensional planar integration to three-dimensional vertical integration by adding port access on bottom and side surfaces. This allows capacitor arrays to be stacked vertically, achieving high capacitance density while maintaining placement flexibility through multiple orientation options and reduced planar footprint requirements.
Data Source
AI summary
Certain aspects of the present disclosure provide a capacitor assembly, a stacked capacitor assembly, an integrated circuit (IC) assembly comprising such a stacked capacitor assembly, and methods for fabricating the same. One exemplary capacitor assembly generally includes a first array of trench capacitors and a second array of trench capacitors. The second array of trench capacitors may be disposed adjacent to and electrically coupled to the first array of trench capacitors. Additionally, the second array of trench capacitors may be inverted with respect to the first array of trench capacitors.