High-Density Connection Patterns for Signal Integrity in Semiconductor Packages
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge lies in creating high-density semiconductor packaging that meets stringent signal performance specifications for high-speed circuits while maintaining a manufacturable package size, as increasing density to reduce size adversely affects signal performance, and managing signal allocation for long and short reach implementations with varying crosstalk requirements.
Innovation Solution
The development of specific connection patterns, such as ball grid arrays and other electrical connection mechanisms, that adhere to design rules optimizing signal performance by controlling adjacency and placement of signal, power, and ground connections, ensuring compliance with far-end and near-end crosstalk, return loss, and insertion loss specifications, and allowing for repeatable patterns to support multiple cores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If connection density is increased to reduce package size, then package size is reduced, but signal performance deteriorates
Solution Approach 1:
The patent applies local quality by implementing different connection patterns for different signal types (high-speed signals versus power/ground signals) within the same package. Specific design rules create localized zones with different connection densities and arrangements, such as separating high-speed signal balls from power/ground balls, and applying different spacing rules for long-reach versus short-reach signals, thereby maintaining signal integrity while achieving high overall density
Solution Approach 2:
The connection pattern is segmented into distinct regions and types: high-speed signal connections are separated from power and ground connections, and further segmented by reach distance (long-reach versus short-reach). This segmentation allows each segment to be optimized independently for its specific function, enabling high-density packaging without compromising signal performance
2Ease of manufacture
If connection density is increased to reduce package size, then manufacturing cost is reduced, but signal performance deteriorates
Solution Approach 1:
The patent creates a universal connection pattern framework that handles multiple signal types (long-reach high-speed, short-reach high-speed, power, ground) within a single standardized design rule set. This multi-functional approach allows the same basic pattern structure to be reused across different package densities and configurations, reducing manufacturing complexity and cost while maintaining signal integrity through the standardized design rules
3Area of stationary object
If signal connections are placed adjacent to each other to increase density, then package size is reduced, but crosstalk increases
Solution Approach 1:
The patent extracts high-speed signal connections from proximity to power and ground connections by implementing mandatory separation rules. High-speed signal balls are positioned in dedicated regions away from power/ground ball arrays, and minimum spacing rules ensure that even when dense, high-speed signals are not placed adjacent to noisy power/ground connections, thereby eliminating crosstalk while maintaining overall package compactness
Data Source
AI summary
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.