Backside Power Network Passive Structure for Uniform ESD Current
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Solution Overview
Problem
Conventional ESD devices face challenges with uneven current distribution and premature failure due to non-uniform activation of fingers during electrostatic discharge events, leading to suboptimal performance and reduced failure thresholds.
Innovation Solution
Integration of ballasting resistances into the drain and source regions of ESD devices to ensure even current distribution across all fingers, enhancing uniform activation and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD devices are used without ballasting resistances, then the device structure is simpler and smaller, but the current distribution is uneven and failure thresholds are reduced
Solution Approach 1:
The patent merges the ballasting resistance function directly into the source and drain regions of the ESD device by doping these regions with extrinsic material. This integration eliminates the need for separate resistance components, achieving both improved current distribution uniformity and reduced device complexity through functional consolidation.
Solution Approach 2:
The patent applies local quality by selectively doping the source and drain regions with extrinsic material to create ballasting resistance only where needed. This localized modification ensures even current distribution across all fingers during ESD events while maintaining the overall device structure simplicity, as only specific regions are modified rather than the entire device.
2Volume of moving object
If device size is reduced for compact designs, then integration density increases, but current distribution uniformity may deteriorate
Solution Approach 1:
The patent changes the electrical parameters of the source and drain regions by doping them with extrinsic material to introduce ballasting resistance. This parameter modification ensures that even in compact device geometries, the current distribution remains uniform across all fingers during ESD events, as the resistance characteristic is tuned to compensate for size-related effects.
3Manufacturing precision
If ballasting resistances are added to source and drain regions, then current distribution becomes even and failure thresholds increase, but manufacturing steps increase
Solution Approach 1:
The patent combines the ballasting resistance formation with the existing source and drain region fabrication steps. By integrating the resistance function into the standard doping process for source and drain regions, the manufacturing precision for current distribution is improved without adding significant fabrication complexity, as the same doping equipment and processes are utilized.
Data Source
AI summary
A semiconductor device includes a passive device including a channel region separating a first source/drain region (S/D) and a second S/D, a shallow trench isolation (STI) extended over the first S/D and the second S/D, and a gate region over the STI and the channel region. The first S/D is extended laterally between the channel region and a first end, and the second S/D is extended laterally between the channel region and a second end. Portions of the gate region are extended vertically through the STI and cover an upper surface of the channel region.