Semiconductor Flip-Flop Circuit Area Reduction via Multi-Layer Routing
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Solution Overview
Problem
The challenge in semiconductor device design is to reduce circuit area while maintaining operating speed, as smaller circuits tend to experience speed degradation.
Innovation Solution
The implementation of a three-metal-routing flip-flop circuit with specific conductive and active region configurations, including a smaller active region (AR-jog structure) and wider conductive regions, helps reduce circuit area without increasing manufacturing complexity and avoids signal propagation delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the circuit area is reduced to integrate more gates, then the gate integration density is improved, but the operating speed of the circuit deteriorates
Solution Approach 1:
The patent applies different width dimensions to different conductive regions within the same circuit layer. Specifically, first conductive regions have a first width while second conductive regions have a second width that is greater than the first width. This local differentiation allows critical signal paths to have wider conductors for better signal integrity and speed, while non-critical areas maintain smaller dimensions for area efficiency.
Solution Approach 2:
The patent utilizes multiple metal routing layers (first metal layer, second metal layer, third metal layer) to create three-dimensional routing paths. By distributing conductive regions across multiple layers and using vertical connections (vias) between layers, the design achieves shorter effective signal paths and better routing flexibility without increasing the planar footprint, thereby maintaining speed while improving integration density.
2Productivity
If the circuit area is reduced, then the gate integration density is improved, but signal propagation delays increase
Solution Approach 1:
The patent segments the routing structure into multiple metal layers with distinct functions. The first metal layer handles certain signal routes, the second metal layer handles other routes, and the third metal layer provides additional routing capacity. This segmentation allows optimization of each layer's routing paths independently, reducing overall signal propagation delay while maintaining compact area.
Solution Approach 2:
By transitioning from two-dimensional planar routing to three-dimensional multi-layer routing, the patent achieves shorter effective signal paths. Vertical vias connect different metal layers, creating direct routing paths that reduce the horizontal distance signals must travel, thereby reducing propagation delay while maintaining small circuit footprint.
Data Source
AI summary
A semiconductor device includes first, second, and third conductive regions and first and second active regions. The first conductive region has a first width and extends along a first direction. The second conductive region has a second width and extends along the first direction. The first width is greater than the second width. The first active region has a third width and extends along the first direction. The second active region has a fourth width and extends along the first direction. The third width is less than the fourth width. The third conductive region extends along a second direction and is electrically connected to the first conductive region. The second direction is different from the first direction. The first and second active regions are neighboring active regions.