Periphery Transistor Active Region Layout for Speed-Leakage Tradeoffs
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Solution Overview
Problem
Conventional semiconductor fabrication methods do not adequately address the specific performance concerns of transistors in different IC circuits, leading to suboptimal device performance due to a 'one-size-fits-all' approach to active region geometries.
Innovation Solution
The active regions of transistors are configured differently based on the type of IC circuit, with enlarged regions for faster device speed and shrunk regions for reduced leakage, optimizing performance for specific circuit needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform active region geometry is used for all transistors in different IC circuits, then the manufacturing process is simplified, but device performance is suboptimal due to inability to address circuit-specific requirements
Solution Approach 1:
The patent applies local quality by configuring active regions with different geometries (e.g., rectangular, L-shaped, U-shaped) depending on the specific circuit requirements. Memory cell transistors use one geometry while periphery circuit transistors use different geometries, allowing each transistor to be optimized for its specific function while maintaining a unified manufacturing process.
2Speed
If active regions are enlarged to achieve faster device speed, then speed performance improves, but leakage increases
Solution Approach 1:
The patent resolves this contradiction by applying different active region geometries to different transistor types. Memory cell transistors use rectangular active regions optimized for speed, while periphery circuit transistors use L-shaped or U-shaped active regions that reduce leakage. This local optimization allows each transistor to achieve its specific performance target without compromising the other.
3Object-generated harmful factors
If active regions are shrunk to reduce leakage, then leakage decreases, but device speed slows down
Solution Approach 1:
The patent addresses this contradiction by assigning different active region geometries to different circuit blocks. Memory cell transistors that require high speed use rectangular active regions with larger dimensions, while periphery circuit transistors that prioritize low leakage use L-shaped or U-shaped active regions with optimized geometries. This localized approach allows simultaneous optimization of speed and leakage across different parts of the same IC.
4Reliability
If different active region geometries are used for different IC circuits, then device performance is optimized for specific circuit needs, but manufacturing complexity increases
Solution Approach 1:
The patent implements parameter changes by varying the geometry parameters (shape, dimensions, orientation) of active regions based on circuit requirements, while keeping the fundamental manufacturing process unchanged. The different geometries are achieved through standard photolithography patterning with adjusted design parameters, avoiding the need for additional manufacturing steps or process complexity.
Data Source
AI summary
An electronic memory device includes a memory-cell circuit. The electronic memory device also includes a non-memory-cell circuit. The non-memory cell circuit includes an active region. The active region extends in a first direction in a top view. The active region includes a first segment and a second segment. The first segment has a first dimension measured in a second direction in the top view. The second segment has a second dimension measured in the second direction different from the first direction in the top view. The second dimension is different from the first dimension.