IC Package Pad Structure for Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Crosstalk between signal paths in integrated circuit packages limits bandwidth and is not effectively addressed by existing solutions, which either increase pin count, package form factors, or degrade performance through thinner dielectrics.
Innovation Solution
Implementing localized regions of thinner dielectrics with conductive pads or plates between adjacent metal layers to increase mutual capacitance, reducing crosstalk without increasing dielectric thickness elsewhere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If dielectric thickness is reduced to decrease crosstalk, then crosstalk is reduced, but manufacturing complexity and performance degradation risks increase
Solution Approach 1:
The patent applies local quality by adding conductive material (metal pads or protrusions) at specific locations between adjacent signal paths rather than uniformly thinning the entire dielectric layer. This localized modification increases mutual capacitance precisely where needed to reduce crosstalk, while maintaining the original dielectric thickness elsewhere, thus avoiding the manufacturing complexity and performance risks associated with global dielectric thinning.
2Object-generated harmful factors
If conventional crosstalk reduction methods are used, then crosstalk is reduced, but pin count or package form factor increases
Solution Approach 1:
The patent changes the electrical parameters of the package by modifying the capacitance between adjacent signal paths through the addition of conductive material. By increasing mutual capacitance locally, the package achieves reduced crosstalk without changing the overall package dimensions, pin count, or form factor, thereby resolving the contradiction between crosstalk reduction and package size.
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
Reduces crosstalk by approximately 20 mV in single-ended DDR memory channels, enabling smaller landing pads and improved signal integrity with minimal impedance changes.
Implementation Method 1
adding conductive material, such as metal pads or protrusions, to increase mutual capacitance between signal paths
Data Source
AI summary
Methods, apparatus, systems, and articles of manufacture to improve signal integrity performance in integrated circuit packages are disclosed. An integrated circuit (IC) package includes a substrate; a first conductive pad in a first metal layer in the substrate; and a second conductive pad in a second metal layer in the substrate. The first metal layer is adjacent the second metal layer with no intervening metal layers therebetween. The integrated circuit (IC) package further includes a conductive protrusion extending from the first conductive pad toward the second conductive pad.