IC Layout With Variable Channel Heights for Speed-Power Balance
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Solution Overview
Problem
Existing integrated circuit designs face challenges in balancing performance, power consumption, and area efficiency, with traditional methods often compromising on one aspect to improve another.
Innovation Solution
The integration of hybrid active regions (HBOs) with varying channel heights and shared power connections within cell areas, allowing for improved average speed, lower power consumption, and efficient area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional uniform cell row layouts are used, then manufacturing simplicity is maintained, but performance and power efficiency are compromised
Solution Approach 1:
The cell area is segmented into multiple cell rows with different row heights, allowing each row to be optimized for specific functions. This segmentation enables performance-critical circuits to use taller rows while standard circuits use uniform rows, resolving the contradiction between performance and manufacturing complexity.
Solution Approach 2:
Different regions of the cell area are assigned different row heights based on local performance requirements. This local quality approach allows tall cell rows to be placed only where performance optimization is needed, while maintaining uniform rows in other areas for manufacturing simplicity.
2Speed
If larger active regions are used to improve speed, then performance increases, but area consumption increases
Solution Approach 1:
The layout structure is made dynamic by introducing variable row heights that can be adjusted based on performance requirements. This dynamic approach allows the design to achieve higher speeds in critical paths without uniformly increasing the area of the entire cell area.
Solution Approach 2:
The problem is solved by moving from a uniform two-dimensional grid to a multi-dimensional structure with varying row heights. This dimensional change allows performance optimization in the vertical dimension without proportionally increasing the horizontal area.
3Ease of manufacture
If uniform row heights are used throughout, then manufacturing is simplified, but power efficiency and speed are reduced
Solution Approach 1:
The row height parameter is changed from uniform to variable based on performance and power requirements. This parameter change allows taller rows to provide better drive strength and lower power consumption for critical circuits, while uniform rows maintain manufacturing simplicity for standard circuits.
Data Source
AI summary
An integrated circuit layout includes at least a cell area, which includes a plurality of cell rows extending along a first direction and each having a uniform row height along a second direction perpendicular to the first direction. The cell area consists of a first area and a second area directly abutting the first area along the second direction. The first area includes a plurality of first channels of p-type and n-type extending along the first direction and separated from each other along the second direction, and each having a first channel height along the second direction. The second area includes a plurality of second channels of p-type and n-type extending along the first direction and separated from each other along the second direction, and each having a second channel height different from the first channel height along the second direction.