Curved IC Layout Features Segmented for Photolithography Accuracy
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Solution Overview
Problem
The challenge in IC fabrication lies in the manufacturability of curved features due to their non-linear edges, which prevent accurate reproduction in photolithographic processes, leading to potential defects and manufacturing discrepancies.
Innovation Solution
The method involves identifying curved features with endlines and curvilinear intervals, calculating feature angles and radii, and dividing these intervals into linear segments with uniform orientation differentials to facilitate manufacturable IC production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If curved features are used in IC layout, then design flexibility and surface area utilization are improved, but manufacturing precision deteriorates due to photolithography process limitations
Solution Approach 1:
The patent segments curved features into multiple linear segments that can be accurately reproduced by photolithography. Each curved feature is divided into a series of straight line segments with controlled lengths and orientations, transforming an unmanufacturable curved geometry into a manufacturable linear approximation while preserving the essential functional characteristics of the original curved design.
2Device complexity
If curved features with non-linear edges are used, then layout complexity is reduced, but manufacturing precision deteriorates due to inability to accurately reproduce non-linear edges
Solution Approach 1:
The patent applies segmentation by dividing complex curved edges into multiple manageable linear segments. This allows the layout to maintain simplified curved geometry for design purposes while the manufacturing process uses the segmented linear representation to achieve accurate edge reproduction within photolithography capabilities.
Solution Approach 2:
The patent changes the geometric parameters of curved features by converting continuous curved edges into discrete linear segments with specific length and orientation parameters. This parameter transformation enables the features to meet manufacturing specifications while retaining the functional intent of the original curved design.
3Manufacturing precision
If curved features are approximated with linear segments, then manufacturing precision is improved, but device complexity increases due to additional segmentation processing
Solution Approach 1:
The patent manages processing complexity through systematic segmentation algorithms that automatically divide curved features into optimal linear segments based on manufacturing constraints. The segmentation process is performed once during layout preparation, and the resulting linear segment representation is then used throughout the manufacturing process, reducing overall complexity despite the initial segmentation step.
Data Source
AI summary
The disclosure provides a method for analysis and manufacture of curved features for integrated circuits. The method includes identifying, within an IC layout, a curved feature including a first endline and a second endline each having at least a threshold length and a curvilinear interval connecting the first endline to the second endline. The method also includes calculating a feature angle and a radius of the curvilinear interval between the first endline and the second endline. Further processing includes determining, based on the feature angle and the radius, whether the curvilinear interval is divisible into a plurality of linear segments each having a same orientation differential relative to the first endline and the second endline. The method additionally includes manufacturing an IC from the layout based on the curvilinear interval and the plurality of linear segments in response to curvilinear interval being divisible into the plurality of linear segments.