Semiconductor Package Substrate Guard Trace Crosstalk Reduction
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Solution Overview
Problem
High-frequency signals in semiconductor packages cause undesirable crosstalk due to their short wavelength, leading to reliability issues in high-performance electronic systems.
Innovation Solution
The semiconductor package design includes a package substrate with specific pad bonding portions, via landing portions, connection trace portions, and guard trace portions that are arranged to mitigate impedance variations and provide a continuous signal return path, reducing crosstalk by ensuring all guard trace, connection plane, and connection trace portions are grounded and parallel to each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high frequency signals are transmitted through signal lines, then operating speed is improved, but crosstalk between signals increases causing reliability issues
Solution Approach 1:
Guard traces are introduced as intermediary elements between adjacent signal lines. These guard traces act as mediators that redirect electromagnetic fields and provide alternative current paths, thereby reducing direct coupling and crosstalk between high-frequency signal lines while maintaining fast operating speeds
Solution Approach 2:
The signal return path is segmented into multiple sections using connection plane portions that are spaced apart from via landing portions. This segmentation allows for distributed impedance control and provides multiple localized reference planes, reducing overall impedance variations along the signal path and improving signal integrity at high frequencies
2Reliability
If guard trace portions are extended to reduce crosstalk, then signal quality is improved, but manufacturing complexity increases
Solution Approach 1:
The guard trace portions serve multiple functions simultaneously: they act as shielding elements to reduce crosstalk, provide additional signal return paths, and contribute to overall impedance control. This multi-functionality reduces the need for separate dedicated structures, thereby limiting the increase in manufacturing complexity while improving signal quality
Data Source
AI summary
A package substrate of a semiconductor package includes second and third pad bonding portions respectively located at both sides of a first pad bonding portion disposed on a substrate body. First to third via landing portions are disposed to be spaced apart from the first to third pad bonding portions. First and second connection trace portions are disposed to be parallel with each other, and a first guard trace portion is disposed to be substantially parallel with the first connection trace portion. The second connection trace portion is connected to the first guard trace portion through a first connection plane portion, and the first connection plane portion connects the second connection trace portion to the second via landing portion. The third pad bonding portion is connected to the third via landing portion through a second connection plane portion.