SOI Gate Layout With Active Region Jogs for Tighter Transistor Spacing
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Solution Overview
Problem
In semiconductor-on-insulator (SOI) technology, there is a challenge in reducing intrinsic gate-to-gate distances while maintaining extrinsic gate-to-gate distances to avoid design rule check violations and improve gate density, signal delays, and power consumption in integrated circuits.
Innovation Solution
The implementation of active region extensions, also known as drain extensions or jogs, which reduce intrinsic gate-to-gate distances while keeping extrinsic gate-to-gate distances compliant with design rules, allowing for increased gate density and reduced signal delays and power consumption by merging source/drain extensions of neighboring transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intrinsic gate-to-gate distances are reduced to increase gate density, then gate density is improved, but design rule check violations occur due to insufficient extrinsic gate-to-gate distances
Solution Approach 1:
The gate structure is divided into intrinsic gate portions (forming the active transistor channel) and extrinsic gate portions (extending beyond the active region). This segmentation allows the intrinsic gate-to-gate distance to be reduced for higher density while the extrinsic gate portions maintain sufficient spacing to comply with design rules for manufacturing and electrical isolation.
Solution Approach 2:
The gate structure extends in multiple dimensions by adding extrinsic gate portions that protrude beyond the active region boundaries. This dimensional extension allows the gate to serve dual purposes: maintaining compact intrinsic spacing for density while providing extended extrinsic regions for design rule compliance and electrical isolation.
2Loss of time
If intrinsic gate-to-gate distances are reduced to improve signal delays and power consumption, then signal delays and power consumption are reduced, but design rule check violations occur
Solution Approach 1:
The gate is segmented into intrinsic and extrinsic portions, enabling the intrinsic gate-to-gate distance to be minimized for reduced signal delays and power consumption, while the extrinsic portions maintain sufficient spacing to satisfy design rules for manufacturing and electrical isolation.
Solution Approach 2:
By extending the gate structure into additional spatial dimensions with extrinsic portions protruding beyond the active region, the design achieves reduced intrinsic spacing for performance improvement while maintaining adequate extrinsic spacing for design rule compliance.
3Device complexity
If active region extensions are merged to save routing resources in M1 metal layer, then routing resources are saved, but manufacturing complexity increases
Solution Approach 1:
Adjacent active region extensions are merged to form continuous structures, eliminating the need for separate M1 metal layer connections between transistors. This merging reduces routing resources and simplifies the metal layer design while the merged extensions maintain manufacturable dimensions and geometries.
Solution Approach 2:
The merged active region extensions serve multiple functions: they provide electrical connection between transistors, act as source/drain regions, and eliminate the need for separate M1 routing. This multi-functionality reduces overall device complexity while maintaining manufacturing feasibility through standard fabrication processes.
Data Source
AI summary
An IC structure includes first and second gates, first and second source regions, a shared drain region, and an isolation region. The first gate has a first portion extending along a first direction and a second portion extending along a second direction. The second gate has a first portion extending along the first direction and a second portion extending along the second direction. The shared drain region extends from the first portion of the first gate to the first portion of the second gate. The first source region is spaced apart from the shared drain region by the first gate. The second source region is spaced apart from the shared drain region by the second gate. The isolation region is between the first portion of the first gate and the first portion of the second gate, and resembles a quadrilateral pattern bordering the shared drain region.