Backside Power Rail Conduction Paths to Reduce IC IR Drops
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Solution Overview
Problem
The miniaturization of integrated circuits has led to stricter design and manufacturing specifications, as well as reliability challenges, particularly in ensuring efficient power distribution and reducing IR drops in complex circuit designs.
Innovation Solution
The integration of frontside and backside power rails with additional via-connectors and extended via-connectors to enhance conduction paths, allowing for improved power and speed performance by reducing IR drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the integrated circuit is miniaturized to reduce device size and increase functionality, then smaller devices with more functionality are achieved, but IR drops increase and power distribution efficiency deteriorates
Solution Approach 1:
The patent introduces backside power rails as a new dimension for power distribution, transitioning from traditional planar frontside-only routing to a three-dimensional architecture that utilizes both frontside and backside of the substrate. This dimensional expansion provides additional conduction paths without increasing the planar footprint, thereby reducing IR drops while maintaining miniaturization benefits
Solution Approach 2:
The power distribution network is segmented into multiple independent conduction paths by distributing via-connectors across the substrate. Instead of relying on a single power rail, the system creates parallel conduction channels that divide the current load, reducing the current density and associated IR drops in each individual path
2Power
If additional via-connectors and extended via-connectors are integrated to enhance conduction paths, then power and speed performance improve, but device complexity increases
Solution Approach 1:
The backside power rails and via-connectors serve multiple functions simultaneously: they provide additional conduction paths for power delivery, act as grounding structures, and enable independent optimization of power and signal routing. This multi-functionality justifies the increased structural complexity by delivering multiple performance benefits from a single architectural addition
Solution Approach 2:
Extended via-connectors serve as intermediary elements that bridge the frontside power rails and backside power rails, creating efficient conduction paths through the substrate. These intermediaries enable the integration of complex three-dimensional power distribution while maintaining manageable design through standardized connection interfaces
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances power and speed performance by increasing the number of conduction paths between frontside and backside power rails, thereby improving the overall performance of integrated circuits.
Implementation Method 1
an integrated circuit including a first frontside power rail and a second frontside power rail each extending in a first direction in a first metal layer at a frontside of a substrate, a first backside power rail and a second backside power rail each extending in a second direction in a second backside metal layer at a backside of the substrate, a first backside via-connector and a second backside via-connector, each extending through the substrate, a first extended via-connector directly connected between the first backside via-connector and the first backside power rail, and a second extended via-connector directly connected between the second backside via-connector and the second backside power rail
Data Source
AI summary
An integrated circuit includes frontside power rails in a frontside metal layer above the substrate, backside signal lines in a first backside metal layer below the substrate, backside power rails in a second backside metal layer below the first backside metal layer, and backside via-connectors passing through the substrate. A first frontside power rail and a first backside via-connector are conductively connected to the source terminal of a first-type transistor. A second frontside power rail and a second backside via-connector are conductively connected to the source terminal of a second-type transistor. A first extended via-connector is directly connected between the first backside via-connector and a first backside power rail. A second extended via-connector is directly connected between the second backside via-connector and a second backside power rail.