Standard Cell Well Layout for High Drive Current in ICs
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Solution Overview
Problem
Integrated circuits require a standard cell with high current driving capability and efficient structure to meet performance requirements, particularly in semiconductor processes where a wide-area standard cell with high current driving capability is needed to satisfy desired operating speed and area constraints.
Innovation Solution
The integrated circuit incorporates a standard cell design with alternately arranged N-wells and P-wells of specific widths, along with power lines applying different supply voltages, to achieve a high current driving capability and efficient structure, allowing for the selection of standard cells with the same function but different structures based on conductivity types and supply voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a standard cell with reduced area is provided according to semiconductor process development, then area is reduced, but current driving capability and operating speed may be insufficient to satisfy desired requirements
Solution Approach 1:
The standard cell is divided into multiple well regions (first wells and second wells) with different conductivity types that are alternately arranged. This segmentation allows each well to contribute to current driving capability while maintaining an optimized overall cell area through selective arrangement and sizing of individual well segments.
Solution Approach 2:
Different wells are assigned different widths (first width and second width) and conductivity types based on their specific functional requirements within the standard cell. This local quality differentiation enables certain wells to provide higher current driving capability where needed while keeping other areas compact, thus resolving the contradiction between reduced area and sufficient current driving capability.
2Power
If a wide-area standard cell is used to provide high current driving capability, then current driving capability is improved, but area increases beyond optimization goals
Solution Approach 1:
Instead of using a single large well, the design segments the well structure into multiple smaller wells (first wells and second wells) with different conductivity types arranged alternately. This segmentation achieves high current driving capability through the combined effect of multiple wells while maintaining a compact area by efficiently utilizing space with alternating conductivity type arrangements.
Solution Approach 2:
The standard cell merges multiple wells with different conductivity types (first wells and second wells) into a single integrated structure. This combining approach allows the cell to leverage the complementary characteristics of different conductivity types to achieve high current driving capability while maintaining an optimized area through shared infrastructure and alternating patterns.
3Reliability
If standard cells with different structures are selected to meet performance requirements, then performance is improved, but device complexity increases
Solution Approach 1:
The standard cell design provides a universal template that can satisfy multiple performance requirements through a single structural configuration. The alternately arranged first wells and second wells with different conductivity types create a multi-functional structure that can be selectively activated or configured to meet different operating speed and current driving capability requirements without requiring entirely different cell structures.
Solution Approach 2:
The design allows for parameter changes within a unified structure by adjusting the number, width, and arrangement of first wells and second wells. This enables optimization of operating speed and current driving capability by modifying parameters such as well width ratios and alternation patterns, rather than requiring fundamentally different cell structures, thus reducing device complexity while maintaining performance flexibility.
Data Source
AI summary
An integrated circuit including a standard cell includes: a plurality of first wells extending in a first horizontal direction with a first width and of a first conductivity type; and a plurality of second wells extending in the first horizontal direction with a second width and having a second conductivity type, wherein the plurality of first wells and the plurality of second wells are alternately arranged in a second horizontal direction that is orthogonal to the first horizontal direction, and when m and n are integers greater than or equal to 3, the standard cell has a length in the second horizontal direction, the length being equal to a sum of m times a half of the first width and n times a half of the second width.