Multi-Bit Flip-Flop Layout for Lower Coupling Capacitance
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Solution Overview
Problem
The miniaturization of integrated circuits leads to stricter design and manufacturing specifications, along with challenges in reliability, particularly due to increased coupling capacitance between conductive structures, which results in higher power consumption.
Innovation Solution
The configuration of a multi-bit flip-flop with offset conductive structures reduces coupling capacitance by increasing the distance between them, optimizing power consumption and area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conductive structures are placed closer together to reduce area, then area usage is improved, but coupling capacitance increases leading to higher power consumption
Solution Approach 1:
The patent applies asymmetry by offsetting the second set of conductive structures from the first boundary, creating an asymmetric layout where the second flip-flop's conductive structures are positioned at different locations relative to the first flip-flop. This asymmetric arrangement increases the distance between conductive structures of adjacent flip-flops, reducing coupling capacitance and power consumption while still achieving compact area usage.
2Area of stationary object
If miniaturization is pursued to reduce device size, then device size is improved, but manufacturing precision requirements become stricter
Solution Approach 1:
The patent applies segmentation by dividing the standard cell into distinct regions with clear boundaries. The first and second flip-flops are segmented with offset conductive structures that create well-defined separation zones. This segmentation approach allows for compact miniaturization while maintaining manufacturability, as each segment can be independently designed and manufactured with standard precision requirements.
3Use of energy by moving object
If conductive structures are offset to reduce coupling capacitance, then power consumption is improved, but area usage increases
Solution Approach 1:
The patent applies dimensionality change by utilizing the second direction (vertical dimension in the layout) to offset the conductive structures. Instead of simply increasing horizontal spacing, the conductive structures are offset in the second direction, allowing for reduced coupling capacitance while maintaining compact horizontal footprint and efficient area usage.
Data Source
AI summary
An integrated circuit includes a set of power rails on a back-side of a substrate, a first flip-flop, a second flip-flop and a third flip-flop. The set of power rails extend in a first direction. The first flip-flop includes a first set of conductive structures extending in the first direction. The second flip-flop abuts the first flip-flop at a first boundary, and includes a second set of conductive structures extending in the first direction. The third flip-flop abuts the second flip-flop at a second boundary, and includes a third set of conductive structures extending in the first direction. The first, second and third flip-flop are on a first metal layer and are on a front-side of the substrate opposite from the back-side. The second set of conductive structures are offset from the first boundary and the second boundary in a second direction.