3D Decoupling Capacitor Assembly for Low-Inductance Chip Interposers
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Solution Overview
Problem
The semiconductor industry faces challenges with increased parasitic inductances due to higher switching speeds in chips, which necessitates improved microelectronic assemblies that effectively utilize decoupling capacitors to maintain constant voltage and supply current efficiently.
Innovation Solution
A microelectronic assembly comprising a semiconductor structure, an interposer, a package substrate, and a decoupling capacitor with alternating dielectric layers and internal electrode layers, where the capacitor has external terminals connected to both the package substrate and a circuit board to manage power delivery and reduce inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If switching speeds in chips are increased to improve processing performance, then productivity is improved, but parasitic inductances increase causing voltage instability
Solution Approach 1:
The patent transitions from planar capacitor arrangements to three-dimensional stacked capacitor structures. Multiple capacitor layers are vertically stacked with interconnects routing signals between layers, effectively utilizing the vertical dimension to increase capacitance density without expanding the lateral footprint. This dimensional change allows more decoupling capacitance to be placed closer to the high-speed switching components, reducing parasitic inductance and improving voltage stability during rapid switching transitions.
Solution Approach 2:
The patent implements nested capacitor structures where smaller capacitors are positioned within or between larger capacitor layers. Multiple capacitor elements are arranged in a hierarchical configuration, with interconnects routing through different levels. This nesting approach maximizes the use of available three-dimensional space, increasing the total decoupling capacitance available to suppress voltage fluctuations caused by high-speed switching while maintaining a compact overall structure.
2Reliability
If more decoupling capacitors are added to reduce parasitic inductance, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple capacitor functions into an integrated stacked capacitor assembly. Rather than placing separate discrete capacitors throughout the package, multiple capacitor layers are merged into a single vertically-integrated structure with shared interconnect routing. This consolidation provides the equivalent of multiple decoupling capacitors while reducing the overall component count and simplifying the package design, thereby improving voltage stability without proportionally increasing device complexity.
Solution Approach 2:
The stacked capacitor structure serves multiple functions simultaneously: each capacitor layer provides decoupling capacitance, the vertical stacking provides mechanical support and thermal pathways, and the interconnect structure provides both electrical routing and structural integrity. This multi-functionality allows a single capacitor assembly to replace what would otherwise require multiple separate components, reducing overall device complexity while maintaining improved voltage stability.
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 proposed assembly effectively reduces inductance and equivalent series resistance, enabling efficient power delivery and voltage regulation while supporting high-frequency signals, thereby addressing the issue of increased parasitic inductances in modern semiconductor chips.
Implementation Method 1
one or more decoupling capacitors are also typically employed so that any sudden requirement for current can be supplied to the chip with the voltage maintained constant or nearly constant
Implementation Method 2
increased switching speeds in chips have resulted in increased parasitic inductances... The decoupling capacitor contains alternating dielectric layers and internal electrode layers
Data Source
AI summary
A microelectronic assembly comprising a semiconductor structure (e.g., IC chip), an interposer electrically connected to the semiconductor structure, and a package substrate electrically connected to the interposer is provided. The assembly also comprises a decoupling capacitor that contains alternating dielectric layers and internal electrode layers, the internal electrode layers containing first internal electrode layers and second internal electrode layers. The capacitor further contains external terminals that are disposed on a first surface of the capacitor and electrically connected to the package substrate and external terminals disposed on the second surface of the capacitor that are electrically connected to a circuit board.