Oblique Stepped Active Area Layout for Uniform Memory Cell Patterns
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Solution Overview
Problem
The reduction in size of semiconductor memory cells for increased capacity leads to instability and operational issues, requiring a design that maintains normal operation while ensuring uniformity in pattern layout.
Innovation Solution
A pattern layout comprising parallel first and second line segments with specific length and width ratios, forming oblique stepped patterns, where each pattern unit has a width of 4WLP and length of 4BLP, with rectangular patterns connected along a direction, and adjusted positions to maintain consistent distances between active area patterns, improving overall uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of memory cell is reduced to increase memory capacity, then the memory capacity is improved, but the operation stability of memory cell deteriorates
Solution Approach 1:
The active area pattern is segmented into multiple rectangular patterns arranged in series to form stepped patterns. This segmentation allows the active area to be divided into functional units that can be precisely controlled and positioned, maintaining operational stability even as overall device dimensions are reduced for increased capacity.
Solution Approach 2:
The patent introduces oblique stepped patterns that extend in multiple directions rather than simple linear arrangements. By utilizing multi-dimensional spatial arrangement of rectangular patterns within the active area, the design maintains adequate spacing and electrical isolation between components while reducing overall footprint, thus preserving reliability at smaller scales.
2Quantity of substance
If the size of memory cell is greatly reduced, then the memory capacity is improved, but the uniformity of pattern layout deteriorates
Solution Approach 1:
The patent employs asymmetric oblique stepped patterns where rectangular patterns are arranged at specific angles and positions rather than symmetric configurations. This asymmetric arrangement allows for optimized spacing control and pattern distribution that maintains manufacturing precision and layout uniformity even when cell size is greatly reduced for higher capacity.
Solution Approach 2:
The invention systematically adjusts geometric parameters including the dimensions, spacing, and angular orientation of rectangular patterns within the active area. By carefully controlling these parameters, the patent maintains consistent pattern layout uniformity across the substrate while reducing overall memory cell dimensions to increase capacity.
3Quantity of substance
If the active area pattern is densely arranged to increase capacity, then the memory capacity is improved, but the distance between adjacent patterns becomes inconsistent, causing operational instability
Solution Approach 1:
The patent performs preliminary design and positioning of rectangular patterns within the active area to establish consistent spacing before fabrication. The oblique stepped patterns are pre-configured with specific geometric relationships and spacing parameters that ensure uniform distances between adjacent patterns, preventing operational instability while maximizing capacity through dense yet controlled arrangement.
Solution Approach 2:
The invention replaces traditional mechanical alignment methods with geometric constraint-based design. By defining fixed angular relationships and proportional spacing parameters for rectangular patterns, the design ensures consistent distances between adjacent patterns through geometric necessity rather than mechanical adjustment, maintaining stability in densely packed high-capacity configurations.
Data Source
AI summary
The invention discloses a pattern layout of an active region and a forming method thereof. The feature of the present invention is that in the sub-pattern unit, an appropriate active area pattern is designed according to the bit line pitch (BLP) and the word line pitch (WLP), the active area pattern is a stepped pattern formed by connecting a plurality of rectangular patterns in series, and the active area pattern is arranged along a first direction, the angle between the first direction and the horizontal direction is A. In addition, according to the angle A, the shortest distance (P) between adjacent stepped patterns, the length and width of sub-pattern units, etc., The positions of some stepped active area patterns are adjusted, so that the distance between multiple active area patterns can be consistent when being repeatedly arranged, thereby improving the uniformity of overall pattern distribution.