ESD Layer in Stacked Semiconductor Devices
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Solution Overview
Problem
The increasing number of input/output pads and through-silicon vias in memory chips, combined with the shrinking size of memory chips, limits the area available for these components, necessitating a solution to protect internal circuits from electrostatic discharge while optimizing space usage.
Innovation Solution
Incorporating an electrostatic discharge (ESD) layer between the semiconductor package substrate and chip, featuring diode-connected ESD circuits connected to vertical electrical connections, which discharge static electricity to ground, thereby protecting internal circuits and optimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of I/O pads and TSVs is increased to meet growing connectivity demands, then the electrical connection capability is improved, but the available area on the memory chip is reduced
Solution Approach 1:
The patent introduces a dedicated ESD protection layer positioned between the memory chip and package substrate, creating a new functional dimension for electrostatic protection. This separates ESD circuitry from the main memory chip area, allowing I/O pads and TSVs to be densely packed on the memory chip without consuming additional area, while the ESD layer handles protection functions in a distinct layer.
2Reliability
If ESD protection circuits are added to protect internal circuits, then the reliability is improved, but the device complexity is increased
Solution Approach 1:
The patent segments the ESD protection function into a separate dedicated layer containing multiple independent ESD protection circuits. Each ESD circuit is associated with specific vertical electrical connections (TSVs), creating modular protection units. This segmentation isolates the ESD protection complexity from the main memory chip circuitry, allowing the memory chip to remain simple while providing comprehensive ESD protection through the specialized ESD layer.
3Area of moving object
If the size of memory chip is shrunk to optimize space usage, then the space efficiency is improved, but the area for I/O pads and TSVs is reduced
Solution Approach 1:
By moving ESD protection circuits to a separate ESD layer, the patent enables the memory chip to be shrunk without compromising I/O pad and TSV area. The ESD layer acts as an intermediary that provides protection functionality without occupying precious memory chip area, thus allowing aggressive chip size reduction while maintaining adequate space for electrical connections.
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 ESD layer effectively protects internal circuits from static electricity while allowing for efficient use of limited space, enhancing the reliability and performance of semiconductor devices by ensuring reliable electrical connections and reducing the risk of damage from electrostatic discharge.
Implementation Method 1
an electrostatic discharge (ESD) layer between a semiconductor package substrate and at least one semiconductor chip... featuring diode-connected ESD circuits connected to vertical electrical connections, which discharge static electricity to ground
Data Source
AI summary
The semiconductor device is provided. The semiconductor device includes a substrate, an electrostatic discharge layer disposed on the substrate and including a plurality of electrostatic discharge circuits, at least one semiconductor chip stacked on the electrostatic discharge layer, and a plurality of vertical electrical connections which pass through the at least one semiconductor chip and the electrostatic discharge layer to connect the at least one semiconductor chip to the semiconductor substrate. The vertical electrical connections are connected to the electrostatic discharge circuits, respectively.