TSV Bump ESD Protection Layout for Parasitic Capacitance Reduction
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Solution Overview
Problem
Conventional semiconductor integrated circuits with wide I/O technology face challenges in reducing power consumption and chip size due to the limitations of ESD protection elements in the TSV bump region, which restricts ESD discharging ability and increases parasitic capacitances and leakage current.
Innovation Solution
The solution involves arranging two ESD protection elements between adjacent TSV bumps, optimizing their layout to reduce resistance and size, and eliminating the need for additional portions in the P-channel ESD protection elements, thereby enhancing ESD discharging ability and reducing power consumption and chip size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ESD protection elements are disposed at adjacent two sides of a TSV bump with pre-amplifier circuitry between them, then ESD protection is provided, but power consumption increases and chip size increases
Solution Approach 1:
The pre-amplifier circuitry is extracted from the region between the ESD protection elements and TSV bump, removing the source of parasitic capacitance. This separation allows the ESD protection elements to be positioned optimally for ESD discharging while eliminating the harmful capacitive coupling between the pre-amplifier and TSV bump.
Solution Approach 2:
A via-hole structure is introduced as an intermediary element to connect the ESD protection elements to the power lines. This via-hole configuration optimizes the ESD discharging path by providing low-resistance connections while minimizing parasitic capacitance, effectively mediating between the ESD protection requirement and power consumption reduction.
2Reliability
If ESD protection elements are disposed at adjacent two sides of a TSV bump with pre-amplifier circuitry between them, then ESD protection is provided, but chip size increases
Solution Approach 1:
The pre-amplifier circuitry is extracted from the crowded region between the ESD protection elements and TSV bump, freeing up valuable chip area. This extraction reduces parasitic capacitance and allows more compact arrangement of the remaining components, thereby reducing overall chip size while maintaining ESD protection functionality.
Solution Approach 2:
The layout is reorganized by utilizing vertical stacking and three-dimensional arrangement of components. The ESD protection elements are positioned in optimized locations with direct via-hole connections to power lines, reducing the horizontal footprint and allowing more efficient use of chip area.
3Reliability
If conventional ESD protection layout is used, then ESD protection is provided, but parasitic capacitances increase
Solution Approach 1:
The pre-amplifier circuitry is completely extracted from the region between the ESD protection elements and TSV bump, eliminating the primary source of parasitic capacitance. This extraction creates electrical isolation that minimizes capacitive coupling, thereby reducing parasitic effects while preserving ESD protection functionality.
Solution Approach 2:
Optimized via-hole structures serve as intermediaries to provide low-inductance, low-capacitance connection paths between the ESD protection elements and power lines. The via-hole configuration minimizes parasitic capacitance by reducing the overlapping area between conductive layers and optimizing the dielectric spacing.
Data Source
AI summary
A semiconductor integrated circuit is provided. In the semiconductor integrated circuit, each of ESD protection circuitries is disposed between two of TSV bumps arrayed in a matrix, the two being arranged adjacent to each other. First main power lines are disposed to overlap P-channel ESD protection elements. Second main power lines are disposed to overlap N-channel ESD protection elements. The first and second main power lines are arranged orthogonally to each other.