Backside Power Rail Switching for Low-Power IC Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current integrated circuit (IC) designs face challenges in minimizing power consumption, particularly in managing power supply to functional circuits through header and footer circuits, which are not efficiently controlled to reduce power usage when circuits are in non-active states.
Innovation Solution
The implementation of a power control circuit with header and footer circuits that include transistors to control power supply by switching ON or OFF, allowing power to be provided to functional circuits only when needed, using feed-through vias to route power from the back side to the front side of the IC, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If header and footer circuits are continuously powered to ensure functional circuit operation, then reliability is improved, but power consumption increases
Solution Approach 1:
The header and footer circuits are designed with dynamic switching capability, allowing them to transition between active and inactive states based on functional circuit requirements. Switches within these circuits enable power to be dynamically connected or disconnected, ensuring reliability when needed while reducing power consumption during non-operational periods.
Solution Approach 2:
The power state of header and footer circuits is changed from a static continuous supply to a dynamic variable state. By controlling the switching elements, the circuits can operate in different power modes (fully powered, partially powered, or completely off), optimizing the balance between reliability and power consumption based on operational requirements.
2Use of energy by moving object
If header and footer circuits are switched OFF to reduce power consumption, then power usage is minimized, but reliability deteriorates
Solution Approach 1:
The power control system incorporates feedback mechanisms that monitor the operational state of functional circuits and automatically adjust the power supply to header and footer circuits accordingly. When functional circuits are active, power is supplied; when inactive, power is cut off, ensuring reliability is maintained only when necessary while minimizing power consumption.
Solution Approach 2:
The system prepares for potential operational needs by maintaining the capability to quickly restore power to header and footer circuits. Control signals are pre-configured to enable rapid power restoration when functional circuits transition from inactive to active states, ensuring reliability is promptly re-established without prolonged power consumption.
3Device complexity
If power rails are routed only on the front side of the substrate, then device complexity is reduced, but power management flexibility is limited
Solution Approach 1:
The power distribution architecture transitions from a single-sided (front side only) configuration to a multi-dimensional approach by utilizing both front and back sides of the substrate. Power rails are routed on the front side and connected through feed-through vias to corresponding rails on the back side, creating a three-dimensional power distribution network that enhances flexibility without significantly increasing overall device complexity.
Solution Approach 2:
The power rail system is segmented into front side and back side components, with feed-through vias serving as connection points. This segmentation allows independent routing and control of power distribution on each side of the substrate, enabling flexible power management strategies while maintaining manageable complexity through modular organization.
4Adaptability or versatility
If feed-through vias are used to route power from back side to front side, then power management flexibility is improved, but device complexity increases
Solution Approach 1:
The feed-through vias are designed to serve multiple functions: they provide mechanical support for routing power between sides, enable electrical connection between front and back power rails, and facilitate thermal management by conducting heat away from active regions. This multi-functionality reduces the need for additional dedicated structures, thereby limiting the increase in device complexity while maximizing power management flexibility.
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 effectively reduces power consumption by ensuring power is only supplied to functional circuits when active, optimizing power management and allowing for flexible power control in IC designs.
Implementation Method 1
A first feed-through via extending through the substrate and coupling the first front side power rail to the first back side power rail
Data Source
AI summary
An integrated circuit (IC) device includes a substrate with a power control circuit, front and back side metal layers, and first and second feed through vias (FTVs). The front side metal layer has first and second front side power rails. The back side metal layer has first and second back side power rails. The first FTV extends through the substrate, and couples the first front side power rail to the first back side power rail. The second FTV extends through the substrate, and couples the second front side power rail to the second back side power rail. The power control circuit is coupled to the first and second front side power rails, and is controllable to electrically connect the first front side power rail to the second front side power rail, or electrically disconnect the first front side power rail from the second front side power rail.