Multi-Bit Flip-Flop Layout With Offset Routing for Lower Power
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Solution Overview
Problem
The miniaturization of integrated circuits has led to stricter design and manufacturing specifications, along with challenges related to power consumption and reliability, particularly in standard cell layout designs.
Innovation Solution
The integration of a multi-bit flip-flop (MBFF) design with offset conductive structures and reduced coupling capacitance between flip-flops, utilizing a set of power rails and flip-flops on a substrate, which reduces power consumption and area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If standard cell layout designs are miniaturized to reduce area and power consumption, then area usage and power consumption are reduced, but manufacturing precision and reliability become more difficult to maintain
Solution Approach 1:
The integrated circuit is divided into multiple standard cells, each containing specific functional blocks (flip-flops, logic gates, etc.). This segmentation allows independent optimization of each cell while maintaining overall circuit functionality, enabling area reduction without compromising manufacturing precision through standardized cell design and placement
Solution Approach 2:
The patent optimizes various parameters including cell height, wire routing dimensions, and component placement coordinates to achieve miniaturization. By carefully adjusting these parameters within manufacturing constraints, the design reduces area usage while maintaining compatibility with manufacturing precision requirements
2Area of stationary object
If standard cell layout designs are miniaturized to reduce area and power consumption, then area usage and power consumption are reduced, but reliability becomes more difficult to maintain
Solution Approach 1:
The design incorporates guard bands, spacing requirements, and design margins in the standard cell layout to compensate for potential manufacturing variations and reliability issues. These preemptive measures ensure that even as cells are miniaturized, sufficient spacing and protection structures maintain circuit reliability under normal operating conditions
Solution Approach 2:
The patent carefully selects and optimizes critical parameters such as minimum spacing between cells, wire widths, and component dimensions to balance area reduction with reliability maintenance. By adjusting these parameters within acceptable ranges, the design achieves miniaturization while preserving reliability through standardized design rules
3Ease of manufacture
If conventional approaches are used for power rail and flip-flop arrangement, then manufacturing is simpler, but power consumption and area usage are higher
Solution Approach 1:
Adjacent standard cells share common power rail structures and grounding networks, merging redundant elements into shared infrastructure. This merging reduces overall power consumption through improved power distribution efficiency and reduces area usage by eliminating duplicate structures, while maintaining ease of manufacture through standardized sharing patterns
Data Source
AI summary
An integrated circuit includes a first power rail on a back-side of a substrate, and extending in a first direction, a first and second flip-flop, and a first conductor on a first metal layer and extending in a second direction. The first flip-flop includes a first region that includes a first inverter, a second inverter having a first output pin, and a first input pin. The second flip-flop includes a second region that abuts the first region at a first boundary, and includes a third inverter, a fourth inverter having a second output pin, and a second input pin. The first conductor overlaps the first boundary, and electrically couples the first output pin and the second output pin together. The first and second flip-flop are on a front-side of the substrate. The first input pin is offset from the first boundary in the second direction.