Step-Down PCB Layout for Higher-Capacity Die Stacks
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Solution Overview
Problem
The increasing height of semiconductor packages due to added memory dies poses a challenge for integration into thinner electronic devices and compliance with industry standards, limiting capacity and performance enhancements.
Innovation Solution
A semiconductor package with a tiered or step-down printed circuit board (PCB) featuring a first portion with a higher thickness and a second portion with a lower thickness, connected by a flexible connector, allowing for increased capacity without increasing overall height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If additional memory dies are added to the stack to increase capacity, then the storage capacity increases, but the height of the semiconductor package increases
Solution Approach 1:
The patent transitions from a single-plane PCB layout to a three-dimensional tiered structure with multiple levels at different heights. The first PCB portion extends at a first height while the second PCB portion extends at a second height lower than the first, creating vertical layering that allows additional memory dies to be mounted on the first portion without increasing the overall package height beyond the first height level.
Solution Approach 2:
The PCB is divided into separate portions (first PCB portion and second PCB portion) at different height levels. This segmentation allows different functional components to be placed at different vertical levels, with memory dies stacked on the higher first portion and other components on the lower second portion, enabling increased capacity while maintaining compact overall height.
2Quantity of substance
If the package height is increased to accommodate more memory dies, then the capacity increases, but the device thickness increases making it incompatible with thin electronic devices and industry standards
Solution Approach 1:
Instead of increasing height vertically in a single direction, the patent uses vertical layering with the tiered PCB structure where components are distributed across different height levels. The connector portion extends to a first height that meets industry standards, while the tiered arrangement allows memory dies to be mounted on the first PCB portion without exceeding this height, thus maintaining compatibility with thin device requirements.
Solution Approach 2:
Different portions of the PCB are assigned different height levels based on their functional requirements. The first PCB portion is positioned at a higher height suitable for memory die mounting, while the second PCB portion and connector areas remain at lower heights to maintain overall package thinness and compliance with industry standards for device integration.
3Quantity of substance
If a tiered PCB structure is used to increase capacity without increasing height, then the storage capacity increases while package height is maintained, but the device complexity increases
Solution Approach 1:
The PCB is segmented into distinct first and second portions at different height levels, each optimized for specific functions. This segmentation simplifies the design process by allowing independent optimization of each portion while maintaining overall integration, reducing the complexity burden compared to a monolithic three-dimensional structure.
Solution Approach 2:
The tiered PCB structure serves multiple functions simultaneously: it provides mechanical support for memory dies at the first height level, accommodates additional components at the second height level, maintains connector compatibility with industry standards, and enables increased storage capacity all within a single integrated package design, thereby reducing overall system complexity.
Data Source
AI summary
A semiconductor package includes a step-down PCB. The step-down PCB includes a first portion having a first height a second portion having a second height that is less than the first height. The step-down PCB can be a single, unitary structure or have different PCB portions. When the step-down PCB has different PCB portions, a flexible connector mechanically and electrically couples the PCB portions together. Due to the reduced thickness of the second portion, additional semiconductor dies can be added to a stack of semiconductor dies, thereby increasing the capabilities of the semiconductor package. Additionally, the first portion includes contacts for a connector. The connector is used to communicatively couple the semiconductor package to an associated connector slot of a host device.