Misaligned Silicide Layout for Compact ESD Protection
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Solution Overview
Problem
Existing electrostatic discharge (ESD) protection structures in integrated circuits are prone to damage from instantaneous power discharge and occupy significant area, necessitating improved designs to enhance ESD and electrical over stress (EOS) capabilities while minimizing space.
Innovation Solution
The use of misaligned source and drain silicide patterns, along with misaligned contact structures, increases the distance between the gate structure and these components, enhancing ESD and EOS capabilities and reducing the occupied area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If source silicide patterns and drain silicide patterns are arranged aligned with one another, then the distance between gate structure and silicide patterns is reduced, but ESD capability and electrical over stress capability deteriorate
Solution Approach 1:
The source silicide pattern and drain silicide pattern are arranged in a misaligned configuration relative to each other, creating an asymmetric layout that increases the distance between the gate structure and the silicide patterns. This asymmetric arrangement enhances ESD capability by preventing direct discharge paths while managing the area occupation through optimized positioning.
Solution Approach 2:
The silicide patterns are arranged in a second direction (transverse direction) rather than only in the first direction (longitudinal direction), utilizing two-dimensional spatial arrangement. This dimensional approach allows increasing the distance to the gate structure while controlling the overall area occupied by the ESD protection device.
2Reliability
If source silicide patterns and drain silicide patterns are arranged misaligned with one another, then ESD capability is enhanced, but the distance between gate structure and silicide patterns increases
Solution Approach 1:
The misaligned arrangement of source and drain silicide patterns creates asymmetric spacing that enhances ESD and EOS capability by increasing the distance to the gate structure. The asymmetric configuration optimizes protection performance while the patterns are arranged in a second direction to manage area occupation.
Solution Approach 2:
The invention changes the spatial parameters of the silicide patterns by arranging them in a misaligned configuration and positioning them in a second direction. This parameter change increases the distance to the gate structure for enhanced reliability while controlling the area occupied through the specific arrangement geometry.
3Reliability
If contact structures are arranged misaligned with one another, then distance to gate structure is increased, but device complexity increases
Solution Approach 1:
The first contact structures and second contact structures are arranged in a misaligned configuration, creating asymmetric positioning that increases the distance to the gate structure and enhances ESD capability. The contact structures are arranged in a second direction, which manages structural complexity through systematic spatial organization.
Solution Approach 2:
The contact structures utilize arrangement in a second direction (transverse direction) rather than only longitudinal positioning. This dimensional approach increases the distance to the gate structure for enhanced reliability while managing device complexity through organized spatial distribution in multiple directions.
Data Source
AI summary
An electrostatic discharge (ESD) protection device includes a semiconductor substrate, a gate structure, a source doped region, a drain doped region, source silicide patterns, and drain silicide patterns. The gate structure is disposed on the semiconductor substrate. The source doped region and the drain doped region are disposed in the semiconductor substrate and located at two opposite sides of the gate structure in a first direction, respectively. The source silicide patterns are disposed on the source doped region. The source silicide patterns are arranged in a second direction and separated from one another. The drain silicide patterns are disposed on the drain doped region. The drain silicide patterns are arranged in the second direction and separated from one another. The source silicide patterns and the drain silicide patterns are arranged misaligned with one another in the first direction.