Gate Resistance Modeling via Segmented Layout Design
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Solution Overview
Problem
Current methods for modeling gate resistance in integrated circuits (ICs) often underestimate values, leading to inaccuracies in design and manufacturing, particularly due to the lack of division of gate width based on gate via locations, which can result in inefficient manufacturing processes and suboptimal IC performance.
Innovation Solution
The method involves dividing the gate width into segments based on gate via locations and applying a distributed resistance model to each segment, using delta resistance networks to calculate effective resistance values, thereby improving accuracy and aligning with design specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gate width is not divided based on gate via locations, then manufacturing process is simpler, but gate resistance modeling accuracy deteriorates
Solution Approach 1:
The gate width is divided into multiple segments based on gate via locations. Each segment is then modeled separately using the distributed resistance model, allowing accurate calculation of gate resistance while accounting for the specific layout configuration. This segmentation approach resolves the contradiction by providing precise modeling without requiring overly complex calculations.
Solution Approach 2:
Different portions of the gate region are assigned different resistance characteristics based on their local properties. The distributed resistance model applies locally to each segment, allowing the gate resistance to be accurately modeled by considering the specific characteristics of each region rather than using a uniform model throughout.
2Measurement precision
If distributed resistance model is applied to each width segment, then gate resistance accuracy improves, but calculation complexity increases
Solution Approach 1:
The gate width is divided into segments, and the distributed resistance model is applied to each segment. This segmentation allows the complex calculation to be broken down into manageable parts, improving accuracy while keeping the calculation process systematic and organized.
Solution Approach 2:
The resistance model uses parameter changes to accurately represent the distributed resistance characteristics. By adjusting resistance parameters for each segment based on its specific properties, the model achieves high accuracy without requiring overly complex mathematical operations.
3Manufacturing precision
If gate via location is not considered in width segmentation, then layout generation is faster, but manufacturing precision deteriorates
Solution Approach 1:
The gate width is divided into segments and resistance values are calculated in advance during the layout generation process. This preliminary action ensures that the layout complies with manufacturing specifications before fabrication, reducing the need for revisions while maintaining efficient generation speed.
Solution Approach 2:
The distributed resistance model provides feedback on whether the layout meets the required specifications. By calculating resistance values for each segment and comparing them against design requirements, the system can quickly identify and correct issues, ensuring manufacturing precision without significant delays.
Data Source
AI summary
A method of generating an IC layout diagram includes receiving the IC layout diagram including an active region, a gate region extending across the active region from a first active region edge to a second active region edge, and a gate via positioned at a location along the gate region between the first and second active region edges, calculating a gate resistance value based on the location and first and second active region edges, based on the resistance value, modifying the IC layout diagram by changing the location of the gate via along the gate region and/or adding another gate via positioned at another location along the gate region, and storing the modified IC layout diagram in a storage device.