Backside Power Rail Header Layout for Selective Memory Powering
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Solution Overview
Problem
Current semiconductor fabrication technologies face challenges in efficiently managing power distribution in memory devices due to the increasing complexity and density of integrated circuits, leading to inefficiencies in power consumption and layout design, particularly with the integration of backside power rails in header circuitry.
Innovation Solution
The implementation of header layout designs that include backside power rails (BPR) for semiconductor devices, utilizing both p-type and n-type transistors connected to respective BPRs, allowing for efficient power distribution by connecting source and drain nodes to different voltage sources through these rails, thereby optimizing power management and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional frontside power rail layouts are used in header circuitry, then power distribution is straightforward, but power consumption efficiency deteriorates due to inability to selectively power memory cells
Solution Approach 1:
The patent moves power rails from the frontside to the backside of the semiconductor substrate, utilizing the third dimension (depth) to resolve the contradiction. Backside power rails enable selective powering of memory cells through vertical connections while maintaining simplified routing, thus improving power consumption efficiency without proportionally increasing layout complexity
Solution Approach 2:
The header circuitry is segmented into multiple sections, each with its own backside power rail connections. This segmentation allows independent power control of different memory cell groups, improving power consumption efficiency by enabling selective powering while distributing layout complexity across modular sections
2Productivity
If memory device density is increased to meet performance demands, then processing speed and capacity improve, but power management efficiency deteriorates due to increased complexity
Solution Approach 1:
The memory array is divided into multiple banks or sections, each with dedicated backside power rail connections. This segmentation enables independent power control of high-density memory sections, maintaining power management efficiency despite increased overall device density and capacity
Solution Approach 2:
By utilizing backside power rails, the patent enables fine-grained power control in high-density memory devices without proportionally increasing routing complexity. The vertical power delivery path allows efficient power management even as memory cell density increases on the frontside
3Adaptability or versatility
If backside power rails are integrated into header circuitry, then selective powering capability improves, but manufacturing complexity worsens due to additional fabrication steps
Solution Approach 1:
The backside power rail structure serves multiple functions: it provides power delivery, enables selective powering control, and acts as a structural element of the header circuitry. This multi-functionality improves selective powering capability while consolidating what could be separate manufacturing steps into an integrated structure
Data Source
AI summary
Header circuitry for a memory device includes multiple backside power rails that form distinct voltage sources for a plurality of switching devices in the header circuitry. The header circuitry includes at least one region of a first conductivity type. A first section in the first region includes one backside power rail (BPR) that forms a first voltage source that provides a first voltage. A second section in the same first region includes another BPR that forms a second voltage source that provides a second voltage that is different from the first voltage.