Hybrid Standard Cell Layout for Low-Voltage Switching Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As semiconductor integrated circuits (ICs) become smaller and more complex, the decreasing operating voltages affect their performance, necessitating a solution to optimize speed, performance, and power consumption while maintaining standard cell area, routability, and pin-accessibility.
Innovation Solution
A hybrid standard cell approach is implemented, where standard cells with different heights and variable via dimensions, pin widths, and metal pitches are used to balance performance and power consumption, allowing for faster switching without overdesign, thus maintaining area, routability, and pin-accessibility similar to other approaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If standard cell height is increased to improve switching speed, then speed is improved, but area increases
Solution Approach 1:
The patent applies local quality by using different standard cell heights in different regions of the circuit. Specifically, first standard cells with a first height are used in a first region, while second standard cells with a second height (different from the first) are used in a second region. This allows optimization of switching speed in specific areas without increasing the overall cell area, as each region uses the appropriate cell height for its functional requirements.
Solution Approach 2:
The patent utilizes the vertical dimension by varying standard cell heights to achieve performance optimization. Instead of increasing area (horizontal dimension) to improve speed, the invention changes the vertical dimension (cell height) to enhance switching speed while maintaining compact area footprint. This dimensional approach allows faster switching without proportionally increasing the standard cell area.
2Use of energy by moving object
If operating voltage is decreased to reduce power consumption, then power consumption is reduced, but speed deteriorates
Solution Approach 1:
The patent applies parameter changes by varying the height parameter of standard cells to compensate for reduced operating voltage. When operating voltage is decreased to reduce power consumption, the invention uses taller standard cells (increased height parameter) in specific regions to maintain adequate switching speed. This parameter adjustment allows the circuit to operate at lower voltages without sacrificing performance in critical paths.
3Speed
If standard cell height is varied to improve performance, then speed is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the circuit into multiple regions (first region and second region) with different standard cell heights. This segmentation allows independent optimization of each region's performance characteristics while using standardized cell designs within each region. The modular approach simplifies manufacturing compared to completely custom cell designs, as each region uses a consistent cell height appropriate for its function.
Data Source
AI summary
A method of forming an integrated circuit includes placing a first and a second standard cell layout design of the integrated circuit on a layout design, and manufacturing the integrated circuit based on at least the first or second standard cell layout design. The first standard cell layout design has a first height. The second standard cell layout design has a second height. Placing the first standard cell layout design includes placing a first set of pin layout patterns on a first layout level over a first set of gridlines, extending in a first direction, and having a first width in a second direction. Placing the second standard cell layout design includes placing a second set of pin layout patterns on the first layout level over a second set of gridlines, extending in the first direction, and having a second width in the second direction.