Non-uniform Substrate Stackup for Signal Integrity
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Solution Overview
Problem
Conventional semiconductor device packaging technologies face challenges in maintaining signal integrity due to improper arrangement of conductive paths, leading to issues like crosstalk and signal loss, which are difficult to control with uniform trace and dielectric thicknesses.
Innovation Solution
The use of non-uniform thicknesses for traces and dielectrics in different layers of the substrate allows for controlled crosstalk and signal loss, with specific thicknesses selected for traces and dielectrics to optimize signal integrity based on the type of signals being carried, such as single-ended or differential signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform thicknesses are used for traces and dielectrics in substrate layers, then manufacturing simplicity is maintained, but signal integrity deteriorates due to crosstalk and signal loss
Solution Approach 1:
The patent applies local quality by varying the thickness of dielectric layers and traces in different regions of the substrate. Specifically, first and second dielectric layers have different thicknesses in different regions, and traces in different layers have different thicknesses, allowing optimization of signal integrity in specific areas while managing crosstalk between layers.
Solution Approach 2:
The patent changes physical parameters of the substrate structure, specifically the thickness parameters of dielectric layers and traces. By adjusting these thickness parameters non-uniformly across different regions and layers, the patent optimizes signal integrity and controls crosstalk without requiring complete redesign of the entire substrate structure.
2Reliability
If non-uniform thicknesses are used for traces and dielectrics in different layers, then signal integrity is improved by controlling crosstalk and signal loss, but manufacturing complexity increases
Solution Approach 1:
The patent implements local quality by applying different thickness specifications to dielectric layers and traces in different regions and layers of the substrate. This allows manufacturing processes to focus on achieving non-uniform thickness only where required for signal integrity, rather than across the entire substrate uniformly.
Solution Approach 2:
The patent modifies manufacturing parameters by specifying non-uniform thickness values for dielectric layers and traces in different locations. This enables manufacturers to adjust thickness parameters during the manufacturing process to achieve optimal signal integrity while managing the complexity through controlled parameter variations.
3Reliability
If improper arrangement of conductive paths is used, then device complexity is reduced, but signal integrity deteriorates due to crosstalk and signal loss
Solution Approach 1:
The patent applies local quality to conductive path arrangement by optimizing the configuration of traces in different layers and regions. The non-uniform thickness design allows for tailored trace arrangements that specifically address crosstalk issues in high-signal-integrity areas while maintaining simpler arrangements elsewhere.
Solution Approach 2:
The patent resolves conductive path arrangement issues by adding vertical dimensionality through multiple substrate layers. By distributing traces across different layers with varying dielectric thicknesses, the patent separates conflicting signal paths in the vertical dimension, reducing crosstalk without requiring overly complex lateral routing arrangements.
Data Source
AI summary
Some embodiments described herein include apparatuses and methods of forming such apparatuses. One such embodiment may include a routing arrangement having pads to be coupled to a semiconductor die, with a first trace coupled to a first pad among the pads, and a second trace coupled to a second pad among the pads. The first and second traces may have different thicknesses. Other embodiments including additional apparatuses and methods are described.