ESD Protection Element Using Gap Structure for Chip Area Reduction
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Solution Overview
Problem
Existing electrostatic discharge protection circuits for integrated circuits require additional space and alter the original design, increasing manufacturing time and cost, necessitating a cost-effective solution that optimizes spatial usage.
Innovation Solution
An electrostatic discharge protection element comprising an I/O pad connected to a conductor via a gap structure, which can include air, dielectric, or porous materials, to direct electrostatic discharge current to ground terminals, with adjustable I/O pad layout for efficient energy dissipation during tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic discharge protection circuit is added between the internal circuit and I/O pins, then the internal circuit is protected from electrostatic discharge damage, but the chip area increases and manufacturing complexity increases
Solution Approach 1:
The patent combines the electrostatic discharge protection function with the existing I/O pad structure by introducing a gap structure directly at the I/O pad perimeter. This merges the protection circuit into the existing layout rather than adding a separate protection circuit block, thereby protecting the internal circuit while minimizing additional chip area occupation.
Solution Approach 2:
The patent transitions from a planar protection circuit layout to a three-dimensional gap structure that extends vertically from the substrate. The gap structure rises above the substrate surface to form a discharge path, utilizing the vertical dimension to provide protection functionality without proportionally increasing the horizontal chip area.
2Reliability
If an electrostatic discharge protection circuit is added between the internal circuit and I/O pins, then the internal circuit is protected from electrostatic discharge damage, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The patent segments the electrostatic discharge protection function into distinct structural components: the I/O pad, the gap structure with dielectric material, and the connection to ground. This segmentation allows each component to be optimized and manufactured independently using existing semiconductor fabrication processes, reducing overall manufacturing complexity compared to integrating a complete protection circuit.
Solution Approach 2:
The patent introduces a dielectric material as an intermediary substance within the gap structure. This dielectric layer serves as a mediator that provides electrical insulation while allowing the gap structure to establish a controlled discharge path to ground, simplifying the manufacturing process by using standard dielectric deposition techniques rather than complex circuit integration.
3Ease of manufacture
If the I/O pad layout is fixed for standard integration, then manufacturing is simplified, but flexibility for different test configurations and energy dissipation paths is reduced
Solution Approach 1:
The patent introduces adjustability into the I/O pad layout by allowing the gap structure's position, size, and orientation to be dynamically configured based on test requirements. The gap structure can be positioned at different locations around the I/O pad perimeter and adjusted in dimensions to optimize energy dissipation paths for various test configurations, providing flexibility while maintaining manufacturing simplicity through standardized gap structure fabrication.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively directs electrostatic discharge current to ground terminals, protecting internal circuits while allowing for flexible integration and reduced manufacturing complexity, making it suitable for various tests and chip-level applications.
Implementation Method 1
the gap structure may be disposed between the I/O pad and the conductor, which is configured to establish a path from the I/O pad to the conductor connected to the ground terminal for conducting the electrostatic discharge current
Data Source
AI summary
An electrostatic discharge protection element is provided, which leads out the electrostatic discharge current between an internal circuit and an input/output terminal in the event of electrostatic discharge. The electrostatic discharge protection element includes an I/O pad, conductor, and a gap structure. The I/O pad is connected between the I/O terminal and the internal circuit, and the conductor is connected to a ground terminal. The gap structure is disposed between the I/O pad and the conductor, which is configured to establish a path from the I/O pad to the conductor connected to the ground terminal for conducting the electrostatic discharge current.