Stacked Memory Package With Integrated Capacitor for Power Noise
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Solution Overview
Problem
Existing semiconductor packaging technologies face challenges in integrating high-capacitance decoupling capacitors effectively, particularly in stacked semiconductor devices, which are crucial for managing power noise and enhancing performance.
Innovation Solution
A semiconductor package design that includes a memory chip with a separate capacitor structure and a logic chip, where the capacitor is electrically connected to both, forming an integrated stack capacitor (ISC) to manage power noise and improve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate capacitor structure is integrated with the memory chip in stacked packaging, then the capacitance value increases and power noise reduction improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the capacitor structure with the memory chip in a stacked packaging configuration, where the capacitor is integrated alongside the memory cell array. This merging approach allows the capacitor to function as an on-chip decoupling element, directly reducing power noise at the source while maintaining a compact form factor. The capacitor structure shares the same packaging substrate as the memory chip, creating a unified power management system.
Solution Approach 2:
The capacitor structure is nested within the same packaging as the memory chip, with both components mounted on the same substrate. The capacitor is positioned in close proximity to the memory chip, effectively nesting the power management function within the memory device footprint. This nested arrangement maximizes space utilization and minimizes parasitic inductance while achieving high capacitance values.
2Reliability
If high-capacitance decoupling capacitors are integrated in stacked semiconductor devices, then power noise management improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent segments the semiconductor package into distinct functional modules: the memory chip with memory cell array and the separate capacitor structure. Both segments are manufactured independently using standard fabrication processes, then precisely positioned and connected through controlled bump bonding. This segmentation allows each component to be optimized separately while maintaining overall manufacturing feasibility through modular assembly.
Solution Approach 2:
The patent uses bump structures as intermediary connection elements between the memory chip and the capacitor. These bumps serve as both mechanical anchors and electrical conductors, facilitating precise alignment and reliable electrical connection. The bump bonding process acts as an intermediary step that bridges the manufacturing processes of the two separate components, enabling high-precision integration without requiring direct monolithic fabrication.
3Reliability
If a separate capacitor structure is used instead of on-chip capacitors, then the capacitance value and power noise reduction improve, but the area occupied and device complexity increase
Solution Approach 1:
The patent transitions from planar on-chip capacitor integration to three-dimensional stacked packaging. By moving the capacitor to a separate structural layer in the vertical dimension rather than attempting to integrate it within the same planar chip layer, the design achieves higher capacitance values without proportionally increasing the footprint area. The stacked configuration utilizes vertical space efficiently, allowing the capacitor structure to occupy a different spatial plane while maintaining compact overall dimensions.
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
The design effectively reduces power noise and enhances the performance of logic chips by utilizing a high-capacitance decoupling capacitor, ensuring efficient operation and resistance to power fluctuations.
Implementation Method 1
an integrated stack capacitor (ISC) including a first surface and a second surface opposite to the first surface; a memory chip having one surface on the first surface of the ISC and including a plurality of memory cells
Data Source
AI summary
A semiconductor package including a first package including a memory chip having a memory cell, and a capacitor structure disposed independently of the memory chip; and a second package including a logic chip configured to access the memory cell, wherein the capacitor structure is electrically connected to the memory chip and the logic chip.