SRAM Cell Layout with Interleaved Wordlines and Segmented Bitlines
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Solution Overview
Problem
Interleaved wordlines in SRAM devices increase the area of SRAM cells while attempting to operate at lower voltages and smaller geometries, posing a challenge in maintaining efficient signal propagation and power usage compared to traditional architectures.
Innovation Solution
The implementation of improved layouts for SRAM devices using interleaved wordlines, where a pair of complementary bit lines are coupled to each column and a pair of interleaved wordlines are coupled to alternating columns, reducing signal propagation delay and power consumption, and optimizing the layout to maintain smaller cell areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If interleaved wordlines are used in SRAM devices, then signal propagation delay and power consumption are reduced, but SRAM cell area increases
Solution Approach 1:
The bitline is divided into two separate complementary bitlines (first bitline and second bitline) that operate independently. Each bitline is coupled to only one access transistor, eliminating the need for shared bitlines and reducing signal propagation delay while maintaining compact cell area through efficient routing.
Solution Approach 2:
The patent introduces a new dimensional approach by using interleaved wordlines (odd and even wordlines) that alternate serving adjacent columns. This spatial arrangement in the wordline dimension allows for reduced signal propagation distance and improved power efficiency without significantly increasing the planar cell area.
2Use of energy by stationary object
If interleaved wordlines are used in SRAM devices, then power consumption is reduced, but SRAM cell area increases
Solution Approach 1:
The bitline is divided into two separate complementary bitlines (first bitline and second bitline) that operate independently. Each bitline is coupled to only one access transistor, eliminating the need for shared bitlines and reducing signal propagation delay while maintaining compact cell area through efficient routing.
Solution Approach 2:
The patent introduces a new dimensional approach by using interleaved wordlines (odd and even wordlines) that alternate serving adjacent columns. This spatial arrangement in the wordline dimension allows for reduced signal propagation distance and improved power efficiency without significantly increasing the planar cell area.
3Area of stationary object
If traditional wordline architecture is used, then SRAM cell area is smaller, but signal propagation delay and power consumption increase
Solution Approach 1:
The bitline is divided into two separate complementary bitlines (first bitline and second bitline) that operate independently. Each bitline is coupled to only one access transistor, eliminating the need for shared bitlines and reducing signal propagation delay while maintaining compact cell area through efficient routing.
Solution Approach 2:
The patent introduces a new dimensional approach by using interleaved wordlines (odd and even wordlines) that alternate serving adjacent columns. This spatial arrangement in the wordline dimension allows for reduced signal propagation distance and improved power efficiency without significantly increasing the planar cell area.
4Area of stationary object
If traditional wordline architecture is used, then SRAM cell area is smaller, but power consumption increases
Solution Approach 1:
The bitline is divided into two separate complementary bitlines (first bitline and second bitline) that operate independently. Each bitline is coupled to only one access transistor, eliminating the need for shared bitlines and reducing signal propagation delay while maintaining compact cell area through efficient routing.
Solution Approach 2:
The patent introduces a new dimensional approach by using interleaved wordlines (odd and even wordlines) that alternate serving adjacent columns. This spatial arrangement in the wordline dimension allows for reduced signal propagation distance and improved power efficiency without significantly increasing the planar cell area.
Data Source
AI summary
Some embodiments relate to an SRAM cell layout including upper and lower cell edges and left and right cell edges. A first power rail extends generally in parallel with and lies along the left cell edge or the right cell edge. The first power rail is coupled to a first power supply. A second power rail extends generally in parallel with the first power rail and is arranged equidistantly between the left and right cell edges. A first bitline extends in parallel with the first power rail and the second power rail and is arranged to a first side of the second power rail. A second bitline, which is complementary to the first bitline, extends in parallel with the first power rail and the second power rail and is arranged to a second side of the second power rail.