Hexagonal Connection Patterns for High-Density Semiconductor Packaging
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Solution Overview
Problem
The challenge lies in creating high-density semiconductor packaging that meets stringent signal integrity specifications for high-speed circuits while maintaining a manufacturable package size, as increasing density can adversely affect signal performance and manufacturing costs.
Innovation Solution
The use of staggered or hexagonal connection patterns for solder balls or pins, which increase connection density by approximately 13% over traditional rectangular patterns, and specific design rules for arranging signal connections to ensure high signal integrity, such as isolating Rx pairs with ground and power connections and avoiding AVDD connections in outermost rows to reduce EMI and Common Mode Return Loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional rectangular connection patterns are used, then manufacturing is simpler, but connection density is lower
Solution Approach 1:
The patent applies asymmetry by transitioning from symmetric rectangular grid patterns to asymmetric hexagonal/staggered patterns. This asymmetric arrangement allows connections to be packed more efficiently, achieving approximately 13% higher connection density while maintaining manufacturability through established hexagonal packing techniques.
Solution Approach 2:
The patent utilizes dimensional optimization by arranging connections in a hexagonal lattice structure that optimizes spatial distribution in two dimensions. This dimensional reconfiguration allows maximum packing density within the planar constraint of the package substrate, resolving the contradiction between density and complexity.
2Area of stationary object
If connection density is increased, then package size is reduced, but signal integrity deteriorates
Solution Approach 1:
The patent applies local quality by implementing differentiated connection patterns for different signal types. High-speed differential pairs are assigned specific locations with optimized spacing and routing, while power and ground connections are distributed differently. This localized optimization maintains signal integrity even at high densities by ensuring each signal type receives appropriate spatial treatment.
Solution Approach 2:
The patent segments the connection pattern into distinct functional zones and signal groups. By dividing the high-density connection array into manageable segments with dedicated routing patterns and isolation structures, the design maintains signal integrity for each segment while achieving overall high density. This segmentation allows complex high-speed signals to be handled independently rather than as a monolithic array.
3Area of stationary object
If high-density patterns are used, then manufacturing cost increases, but package size decreases
Solution Approach 1:
The patent applies universality by designing a hexagonal connection pattern platform that can accommodate multiple signal types and package configurations. The same fundamental hexagonal lattice structure serves as the basis for various product variants, allowing manufacturers to achieve high density without developing entirely new manufacturing processes for each application. This multi-functional approach reduces tooling costs and manufacturing complexity.
Data Source
AI summary
Hexagonally arranged connection patterns for device packaging allow high density circuitry dies to be assembled into packages of manufacturable size. The connection patterns may be patterns for solder ball arrays or other types of connection mechanisms under a semiconductor package. Despite the increased density of the connection patterns, the connection patterns meet the demanding crosstalk specifications for high speed operation of the high density circuitry.