Integrated Standard Cell Layout With Uniform Transition Gates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing design of integrated circuits (ICs) requires significant reserved space between standard cells, leading to increased circuit area, fabrication complexity, and potential defects, which degrade circuit performance and yield.
Innovation Solution
The proposed solution involves an integrated circuit layout structure where standard cells are placed in abutment with each other, utilizing a transition area with uniform gate stacks to facilitate efficient packing and reduce fabrication challenges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If standard cells are placed close to each other according to pre-defined rules, then circuit area is reduced, but fabrication difficulty and defect risk increase
Solution Approach 1:
The standard cell is divided into a circuit area and a transition area. The transition area contains uniform gate stacks that act as a buffer zone between adjacent standard cells. This segmentation allows cells to be placed closer together while the uniform transition structures maintain fabrication ease and reduce defect risks by providing a standardized interface region.
Solution Approach 2:
The transition area with uniform gate stacks serves as an intermediary structure between adjacent standard cells. This intermediate region facilitates close packing by providing a standardized transition zone that simplifies the fabrication process and reduces the likelihood of defects at cell boundaries, thereby enabling reduced circuit area without compromising manufacturability.
2Reliability
If reserved space is increased between standard cells, then fabrication risk is reduced, but circuit area increases
Solution Approach 1:
Instead of uniformly increasing reserved space throughout the circuit, the invention applies a localized transition area with uniform gate stacks at the boundaries of standard cells. This local quality approach provides enhanced fabrication reliability specifically where needed at cell interfaces, while maintaining compact overall circuit area by not expanding the entire cell footprint.
3Productivity
If transition area with uniform gate stacks is used, then packing density is enhanced, but device complexity increases
Solution Approach 1:
The uniform gate stacks in the transition area serve multiple functions: they act as electrical isolation between adjacent cells, provide a standardized interface for close packing, and maintain consistent fabrication patterns. This multi-functionality enhances packing density while avoiding increased device complexity by using a universal, repeating structure rather than complex unique features.
Data Source
AI summary
An IC includes a first standard cell (SC1) having a first circuit area (CA1) and a first transition area (TA1) placed on an edge of the CA1; and a SC2 having a CA2 and a TA2 placed on an edge of CA2′. CA1 includes a first and a second active region (AR1 and AR2) longitudinally oriented along a first direction (D1), and a first gate stack (G1) along a D2⊥D1 and extending over AR1 and AR2. G1 includes a first gate segment (GS1) contacting AR1 and a GS2 contacting AR2. GS1 and GS2 are different in composition. GS1 and GS2 are associated with a pFET and a nFET, respectively. TA1 includes a G2 longitudinally oriented along D2 and spans between opposite cell edges of the SC1. G2 is a lengthwise uniform gate stack. SC2 is placed in abutment with the SC1 such that TA1 and TA2 share a common edge.