Noise Attenuation Wall for IC Package Crosstalk
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Solution Overview
Problem
Integrated circuit packages face challenges with crosstalk due to increased density, leading to noise interference between signals from different circuit dies within the same package, which existing solutions fail to adequately address without consuming excessive circuit platform real estate.
Innovation Solution
The implementation of a noise attenuation wall using a combination of microbumps, C4 bumps, and vias to create an isolation region that attenuates noise by coupling aggressor signals to ground, effectively reducing crosstalk between digital and analog circuitry within the same IC package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If integrated circuit density is increased to improve productivity, then more logic features are implemented in a given size, but crosstalk and noise interference between signals increase
Solution Approach 1:
The patent introduces an intermediary noise attenuation wall structure composed of microbumps, C4 bumps, and vias that acts as a mediator between digital and analog circuit dies. This wall provides a controlled impedance path to ground, intercepting noise signals before they can couple to sensitive circuits, thereby resolving the crosstalk issue while maintaining high density integration
2Object-affected harmful factors
If noise attenuation structures are added to reduce crosstalk, then noise interference is reduced, but circuit platform real estate is consumed
Solution Approach 1:
The patent applies local quality by implementing noise attenuation features only in specific critical areas where digital and analog circuits are in close proximity. The noise attenuation wall is strategically positioned at interfaces and around high-risk signal paths, providing targeted noise shielding only where needed rather than across the entire platform, thus minimizing area consumption while maintaining effectiveness
3Productivity
If multiple circuit dies are integrated in the same package to improve productivity, then more functionality is achieved, but opportunities for signal interference increase
Solution Approach 1:
The patent segments the multi-die package into distinct noise zones by implementing noise attenuation walls that physically and electrically separate digital and analog die regions. The segmentation is achieved through distributed microbumps and C4 bumps that create isolated ground domains, preventing noise propagation between different functional blocks while maintaining system-level integration
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 effectively reduces noise interference between different types of circuitry, allowing for more efficient use of circuit platform space by providing targeted noise shielding, thereby enhancing the overall performance of integrated circuit packages.
Implementation Method 1
coupling aggressor signals to ground
Implementation Method 2
using a combination of microbumps, C4 bumps, and vias to create an isolation region
Data Source
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AI summary
An embodiment of an apparatus is disclosed. For this embodiment of the apparatus, an interposer (203) has first vias (211). First interconnects (205) and second interconnects (206) respectively are coupled on opposite surfaces of the interposer (203). A first portion of the first interconnects (205) and a second portion of the first interconnects (205) are spaced apart from one another defining an isolation region (220) between them. A substrate (204) has second vias (212). Third interconnects (207) and the second interconnects (206) are respectively coupled on opposite surfaces of the package substrate (204). A first portion of the first vias (211) and a first portion of the second vias (212) are both in the isolation region (220) and are coupled to one another with a first portion of the second interconnects (206).