SRAM Array Segmentation for Speed-Area Trade-off
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Solution Overview
Problem
The semiconductor industry faces challenges in designing SRAM devices that balance data access speed and area efficiency, as existing SRAM devices either prioritize speed or area optimization but not both simultaneously.
Innovation Solution
The integration of two types of memory cells within an integrated circuit chip, where one type is optimized for smaller area and the other for faster data access, utilizing distinct design criteria such as different pass gate driving capabilities and layout configurations to achieve these goals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If SRAM devices are designed to have faster data access, then data access speed is improved, but area per stored bit increases
Solution Approach 1:
The patent divides the SRAM array into multiple banks, where each bank contains memory cells with uniform word line landing pad orientations. This segmentation allows different banks to be optimized for different purposes (speed vs. area) while using the same manufacturing process, resolving the contradiction between data access speed and area efficiency
Solution Approach 2:
The patent applies different design configurations to different regions of the SRAM array. Specifically, different banks use different orientations of word line landing pads relative to bit line segments, creating local variations in performance characteristics. This allows simultaneous optimization of both speed and area efficiency in different parts of the same array
2Area of moving object
If SRAM devices are designed to occupy less area per stored bit, then area efficiency is improved, but data access speed decreases
Solution Approach 1:
The patent segments the SRAM array into multiple banks with different word line landing pad orientations, allowing area-optimized cells to be grouped in specific banks while maintaining manufacturing uniformity across the entire array
Solution Approach 2:
Different banks are configured with different landing pad orientations to achieve local optimization for area efficiency, while the overall array maintains the capability for fast data access through the diversified configuration approach
Data Source
AI summary
An integrated circuit chip includes a first type memory cell and a second type memory cell. The first type memory cell includes a first reference line landing pad and a first word line landing pad. The first reference line landing pad of the first type memory cell and the first word line landing pad of the first type memory cell are aligned along a first direction. The second type memory cell includes a first reference line segment extending along the first direction and a first word line landing pad. The first word line landing pad of the second type memory cell and the first reference line segment of the second type memory cell are spaced apart along a second direction different from the first direction.