Shaped Metal Edge Geometry for High-Voltage IC Isolation
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Solution Overview
Problem
The maximum operating voltage of integrated circuits (ICs) with closely spaced conductive lines is limited by the onset of electric discharge due to high electric field magnitudes near sharp corners of conductive lines.
Innovation Solution
The shape of conductive lines in ICs is tailored to reduce the maximum electric field by incorporating electric field-reducing structures such as rounded corners, curved side surfaces, sloped side surfaces, and stepped side surfaces, with radii of curvature greater than 1 micron.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive lines with sharp corners are used, then manufacturing is simpler, but electric discharge occurs at high voltages due to high electric field magnitudes
Solution Approach 1:
The patent applies curvature by rounding the corners of conductive lines with a radius of curvature greater than 1 micron. This spherical/curved geometry reduces electric field concentration at sharp edges, preventing electric discharge while maintaining manufacturing feasibility through standard lithographic processes that can achieve such rounded corners.
Solution Approach 2:
The patent changes the geometric parameter of the conductive line corners from sharp (zero radius) to rounded (radius > 1 micron). This parameter modification directly reduces the maximum electric field magnitude, allowing operation at higher voltages without discharge, while remaining compatible with existing fabrication capabilities.
2Productivity
If conductive lines are closely spaced to increase integration density, then device functionality is improved, but electric discharge risk increases due to high electric field magnitudes
Solution Approach 1:
By rounding the corners of closely spaced conductive lines, the patent reduces electric field concentration at each line's corners. This allows lines to be placed closer together without increasing discharge risk, thereby enabling higher integration density while maintaining reliability.
Solution Approach 2:
The patent applies different geometric qualities to different parts of the conductive lines - specifically rounding only the corners while maintaining straight segments between them. This localized modification targets the specific areas (corners) where electric field concentration occurs, allowing close spacing without compromising reliability.
3Reliability
If rounded corners with radius greater than 1 micron are used, then operating voltage is increased, but manufacturing precision requirements are heightened
Solution Approach 1:
The patent specifies a minimum radius of curvature greater than 1 micron, which is a relaxed parameter compared to typical lithographic features. This parameter choice balances the need for electric field reduction with the capabilities of standard manufacturing processes, avoiding excessive precision requirements while achieving the desired voltage increase.
Data Source
AI summary
The disclosed technology generally relates to lithographically defined conductive lines for integrated circuit devices formed by plating, and more particularly to conductive lines shaped to reduce the magnitude of electric field in the electric field distributions around conductive lines of integrated and monolithic transformers and isolators.