Semiconductor Chip Pads with Different Surface Areas for Parasitic Capacitance Compensation
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Solution Overview
Problem
Current semiconductor packaging technologies face challenges in managing parasitic capacitance due to differences in wiring lengths, which affect the electrical reliability and performance of semiconductor chips by generating varying parasitic capacitances that can impact signal transfer and chip connectivity.
Innovation Solution
The semiconductor chip design includes chip pad units with first and second pads of different surface areas, along with a chip pad selection circuit unit that electrically connects one pad to the signal input/output circuit, allowing for selective bonding to package substrate connection pads, thereby compensating for differences in parasitic capacitance by optimizing pad and package parasitic capacitances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chip pads of different surface areas are used to compensate for wiring length differences, then parasitic capacitance deviation is reduced, but chip structure complexity increases
Solution Approach 1:
The patent applies local quality by creating chip pad units with different surface areas (first chip pads and second chip pads) at different locations on the chip. Each pad unit is locally optimized with pads of specific areas to compensate for the parasitic capacitance caused by varying wiring lengths to different connection pads on the package substrate, thereby reducing overall parasitic capacitance deviation while maintaining a relatively simple global chip structure.
2Reliability
If multiple chip pads with different surface areas are implemented, then signal transfer characteristics are stabilized, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the chip pad structure into multiple discrete chip pad units, each containing first and second chip pads with different surface areas. This segmentation allows for standardized design and fabrication of pad units with controlled surface area ratios, making the manufacturing process more manageable and precise compared to creating entirely custom pad structures.
Data Source
AI summary
A semiconductor chip includes a chip body including a signal input/output circuit unit, a chip pad unit disposed on one surface of the chip body and including first and second chip pads having different surface areas from each other, and a chip pad selection circuit unit disposed in the chip body and electrically connected to the signal input/output circuit unit and the chip pad unit. The chip pad selection circuit unit is configured to select one chip pad of the first and second chip pads and electrically connect the selected one chip pad to the signal input/output circuit unit.