Memory Card Adapter Substrate Signal Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing memory card adaptors are not suitable for high-frequency operations due to limitations in signal line return paths, which can lead to signal interference and data skew issues.
Innovation Solution
The memory card adaptor incorporates a package substrate with a separate return path for signal lines, allowing for low-impedance current flow and reducing signal interference, and includes multiple layers for flexible signal routing and passive elements for synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-layer substrate is used in memory card adaptors, then the device complexity is low and manufacturing is simple, but signal interference and data skew occur during high-frequency operations due to inadequate return paths
Solution Approach 1:
The substrate is divided into multiple layers (first substrate layer, second substrate layer, and intermediate layer) with distinct functions. The signal lines are segmented across layers with dedicated return paths in the intermediate layer, separating signal transmission from power and ground functions to reduce interference.
Solution Approach 2:
The return path is moved from the same plane as signal lines to a separate intermediate layer between the first and second substrate layers. This three-dimensional layering allows signal lines and their return paths to be vertically separated, reducing electromagnetic interference while maintaining low-impedance return paths.
2Reliability
If signal lines share the same layer as power and ground lines, then the manufacturing process is simplified, but signal interference increases during high-frequency operations
Solution Approach 1:
The substrate is divided into multiple layers (first substrate layer, second substrate layer, and intermediate layer) with distinct functions. The signal lines are segmented across layers with dedicated return paths in the intermediate layer, separating signal transmission from power and ground functions to reduce interference.
Solution Approach 2:
The return path is moved from the same plane as signal lines to a separate intermediate layer between the first and second substrate layers. This three-dimensional layering allows signal lines and their return paths to be vertically separated, reducing electromagnetic interference while maintaining low-impedance return paths.
3Speed
If traditional routing methods are used without separate return paths, then the device complexity remains low, but data skew issues arise during high-speed operations
Solution Approach 1:
The return path is moved from the same plane as signal lines to a separate intermediate layer between the first and second substrate layers. This three-dimensional layering allows signal lines and their return paths to be vertically separated, reducing electromagnetic interference while maintaining low-impedance return paths.
Solution Approach 2:
The impedance of the return path is optimized by controlling the width and position of ground lines in the intermediate layer. The return path width is specifically designed to achieve low-impedance characteristics, enabling high-frequency signal transmission without data skew.
4Reliability
If power and ground lines are routed without dedicated return paths, then the manufacturing process is simpler, but signal interference increases affecting high-frequency characteristics
Solution Approach 1:
The substrate is divided into multiple layers (first substrate layer, second substrate layer, and intermediate layer) with distinct functions. The signal lines are segmented across layers with dedicated return paths in the intermediate layer, separating signal transmission from power and ground functions to reduce interference.
Solution Approach 2:
The return path is moved from the same plane as signal lines to a separate intermediate layer between the first and second substrate layers. This three-dimensional layering allows signal lines and their return paths to be vertically separated, reducing electromagnetic interference while maintaining low-impedance return paths.
Data Source
AI summary
A memory card adaptor is provided which includes a housing including a bottom lid and a top lid that form the housing. The housing may be configured to receive a memory card. The memory card adaptor may include a package substrate between the bottom lid and the top lid. The package substrate may include a core having a first surface and a second surface; a first layer on the first surface, and the first layer may include a plurality of contact lands; and a second layer on the second surface, and the second layer may include a plurality of contact pads that are electrically connected with the contact lands through a plurality of via holes. The plurality of via holes may be formed such that they penetrate the core. One of the first and second layers may include a return path on at least one signal line.