IC Chip Pad Arrangement for USB Type-C Signal Integrity
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Solution Overview
Problem
The USB Type-C interface's flip-able feature requires two pairs of TX and RX signals for signal transmission, but existing designs often arrange these pads in the same row, leading to crosstalk issues and increased chip size and costs due to the need for multiple ports, which complicates signal quality and increases costs.
Innovation Solution
The arrangement of TX and RX differential pair pads in two non-adjacent rows on both the integrated circuit chip and package substrate reduces crosstalk by placing transmission and reception pads of the same group in different rows, allowing for a more compact design compatible with USB 4 specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If TX and RX differential pair pads are arranged in the same row, then the chip size is reduced, but crosstalk between differential pairs increases
Solution Approach 1:
The patent transitions from arranging all pads in a single row (one-dimensional arrangement) to distributing pads across multiple rows (two-dimensional arrangement). Specifically, TX differential pair pads are placed in one row while RX differential pair pads are placed in another row, thereby reducing spatial proximity and crosstalk while maintaining compact chip size.
2Adaptability or versatility
If two pairs of TX and RX signals are included for flip-able feature, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent employs asymmetric arrangement where TX differential pair pads and RX differential pair pads are positioned differently in space (different rows). This asymmetric layout reduces the complexity of signal routing and minimizes interference between transmission and reception pairs, thereby supporting the flip-able feature without proportionally increasing device complexity.
3Manufacturing precision
If TX and RX pads are placed adjacent to each other, then the manufacturing precision requirement is reduced, but signal quality deteriorates due to crosstalk
Solution Approach 1:
The patent segments the pad arrangement into distinct groups: TX differential pairs in one row and RX differential pairs in another row. This segmentation physically separates transmission and reception signals, reducing crosstalk and improving signal quality. The segmentation approach maintains reasonable manufacturing precision requirements while enhancing signal integrity.
Data Source
AI summary
An integrated circuit chip has an active surface and a chip pad arrangement on the active surface. The chip pad arrangement includes four pairs of chip pads arranged in two rows along a side edge of the active surface. Two pairs of chip pads are a first transmission differential pair chip pad and a first reception differential pair chip pad respectively. Positions of the two pairs of chip pads are not adjacent to each other and are in different rows. The other two pairs of chip pads are a second transmission differential chip pad and a second reception differential chip pad respectively. Positions of the other two pairs of chip pads are not adjacent to each other and are in different rows. In addition, a package substrate corresponding to the integrated circuit chip and an electronic assembly including the package substrate and the integrated circuit chip are also provided.