Deep Trench Capacitor Layout for Stable WOW Semiconductor Power
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Solution Overview
Problem
Wafer-on-wafer (WOW) semiconductor devices with large capacitors increase routing costs and deteriorate reliability due to inefficient capacitor placement, leading to voltage variations and high power consumption.
Innovation Solution
The semiconductor device design incorporates deep trench capacitors (DTCs) embedded within the insulation layer close to processing units, reducing voltage variation and power consumption by minimizing the distance between capacitors and processing units, and includes a diode to direct electrons to ground, enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large capacitors are utilized to facilitate stable operations, then voltage stability is improved, but routing costs increase and reliability deteriorates
Solution Approach 1:
The patent transitions capacitor placement from a planar two-dimensional layout to a three-dimensional vertical stacking architecture. Capacitors are positioned on different layers (first capacitor on first layer, second capacitor on second layer) and connected via vertical conductive structures (through-silicon vias), enabling spatial separation that reduces routing complexity while maintaining electrical connectivity for voltage stability.
Solution Approach 2:
The patent implements nested capacitor structures where capacitors are embedded within insulating layers that are themselves embedded in the semiconductor substrate. The first capacitor is embedded in a first insulating layer, and the second capacitor is embedded in a second insulating layer, creating a nested configuration that integrates multiple capacitive elements within a compact volume, reducing overall device footprint and routing requirements.
2Ease of manufacture
If capacitors are placed farther from processing units, then manufacturing is simplified, but voltage variation increases and power consumption rises
Solution Approach 1:
The patent utilizes vertical stacking to place capacitors in close proximity to processing units in the third dimension. By positioning capacitors on different layers directly above or below processing units and connecting them via short vertical conductive paths, the design achieves minimal current path lengths, reducing resistive power losses while maintaining manufacturing simplicity through standardized layer-by-layer fabrication processes.
3Device complexity
If capacitors are placed farther from processing units, then device complexity is reduced, but response speed decreases
Solution Approach 1:
The patent achieves fast response speed by positioning capacitors vertically adjacent to processing units across different layers. The short vertical conductive paths (through-silicon vias) provide low-inductance, low-resistance connections that enable rapid charge and discharge cycles, improving the speed at which capacitors can respond to processing unit demands while maintaining a relatively simple planar footprint that does not significantly increase device complexity.
Data Source
AI summary
A semiconductor device is provided. The semiconductor device comprises a first semiconductor die comprising a first capacitor, and a second semiconductor die in contact with the first semiconductor die and comprises a diode. The first semiconductor die and the second semiconductor die are arranged along a first direction, and a diode is configured to direct electrons accumulated at the first capacitor to a ground.