Integrated Circuit Surface Active Area Constrained by Local Temperature
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Solution Overview
Problem
Variations in surface temperatures during semiconductor manufacturing processes lead to differences in dopant diffusion and performance among circuit blocks of integrated circuits, resulting in inconsistent circuit speed and increased leakage current.
Innovation Solution
Implementing a design rule to constrain the surface active area of diffusion layers and adjusting transistor gate lengths based on localized surface temperature effects, while floor planning circuit blocks to optimize thermal conduction and reduce thermal reflectivity differences, thereby enhancing dopant activation and reducing performance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surface active area of diffusion layers is increased to improve dopant activation, then dopant diffusion is enhanced, but circuit leakage current increases
Solution Approach 1:
The patent applies local quality by differentiating the surface active area constraints based on the specific circuit block requirements. Different circuit blocks have different diffusion pattern densities, and the design rule allows for localized optimization where each block's diffusion area is constrained according to its specific needs rather than applying a uniform constraint across the entire IC, thus achieving good dopant activation where needed while minimizing leakage in other areas.
2Reliability
If the surface active area of diffusion layers is increased to improve dopant diffusion, then dopant activation is enhanced, but circuit speed variation among blocks increases
Solution Approach 1:
The patent employs parameter changes by establishing a design rule that modifies the surface active area parameter of diffusion layers. By constraining the surface active area to a maximum amount, the patent changes the physical parameters of the diffusion process to achieve more uniform dopant activation across different circuit blocks, thereby reducing performance variation while maintaining adequate dopant diffusion.
3Ease of manufacture
If circuit blocks with high diffusion pattern density are placed without thermal management, then manufacturing is simplified, but temperature variation during processing increases
Solution Approach 1:
The patent introduces thermal management structures as intermediaries between circuit blocks with high diffusion pattern density. These structures act as thermal mediators that conduct heat away from or toward specific blocks to compensate for temperature variations caused by high diffusion density, thereby maintaining more uniform processing temperatures without complicating the manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases circuit speed, reduces leakage current, and improves overall IC performance by ensuring consistent dopant activation and thermal management across circuit blocks.
Implementation Method 1
The second block is placed to provide thermal conduction to at least one region of the first block associated with the first active area to increase a temperature thereof during a semiconductor process in order to enhance activation of dopants
Implementation Method 2
enhance activation of dopants in the at least one region of the first block
Data Source
AI summary
An embodiment of an integrated circuit is disclosed. For this embodiment, the integrated circuit includes circuit blocks. At least one transistor of a circuit block of the circuit blocks includes a portion of a semiconductor substrate having a diffusion layer. The circuit block has a relatively high diffusion pattern density as compared with others of the circuit blocks. The diffusion layer has an exposed surface active area constrained responsive to a design rule. The design rule is to limit to a maximum amount the surface active area in order to improve at least one parameter of the at least one transistor selected from a group consisting of an increase in switching speed and a decrease in leakage current of the at least one transistor of the circuit block having the relatively high diffusion pattern density.