Header Circuit Integration in Metal Layers for IC Power Gating
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Solution Overview
Problem
As semiconductor integrated circuits (ICs) become smaller and more complex, reduced operating voltages affect IC performance and increase power consumption due to leakage currents, necessitating improved power management techniques.
Innovation Solution
The integration of a header circuit between metal layers in an IC, which includes a switch configured to provide different supply voltages to active and inactive circuits, reducing leakage current and power consumption by selectively turning off power to unused circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If operating voltage is reduced to enable smaller and more complex ICs, then device size and complexity are improved, but power consumption increases due to leakage currents
Solution Approach 1:
The IC is divided into multiple operational modes (active and inactive states) for different circuits. Power gating circuits selectively disconnect power supply to specific circuit blocks when they are not in use, segmenting the power distribution network to reduce leakage currents in inactive portions while maintaining full power to active portions.
Solution Approach 2:
The patent implements dynamic power management through power gating circuits that can switch between different power states based on circuit activity. The ability to dynamically turn off power to inactive circuits and restore it when needed allows the system to adapt power consumption to actual operational requirements, reducing overall energy loss.
2Loss of energy
If power gating is implemented to reduce power consumption, then power consumption and leakage currents are reduced, but device complexity increases
Solution Approach 1:
The power gating circuits are designed to perform multiple functions: they act as switches for power control, provide leakage current blocking paths, and can be integrated with existing circuit blocks. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in overall device complexity while achieving power reduction goals.
Solution Approach 2:
The patent introduces power gating circuits as intermediary elements between the power supply and various circuit blocks. These intermediary components selectively control power flow without requiring fundamental changes to the core circuit architecture, thus reducing power consumption while adding minimal complexity through standardized interface circuits.
3Loss of energy
If header circuit is integrated between metal layers, then power consumption is reduced through selective power gating, but manufacturing complexity increases
Solution Approach 1:
The power gating circuits are nested within the existing multi-layer metal structure of the IC. By integrating the power gating functionality into the existing metal layers and utilizing the existing fabrication process steps, the patent avoids adding significant manufacturing complexity while achieving the power reduction benefits of selective power gating.
Solution Approach 2:
The patent merges the power gating circuit functionality with the existing metal interconnect structure. The header circuits are combined with the metal layers during the same fabrication process, eliminating the need for separate manufacturing steps and reducing overall manufacturing complexity despite the added power management functionality.
Data Source
AI summary
A method of forming an integrated circuit includes forming at least a first or a second set of devices in a substrate, forming an interconnect structure over the first or second set of devices, and depositing a set of conductive structures on the interconnect structure. The first and second set of devices are configured to operate on a first supply voltage. Forming the interconnect structure includes depositing a set of insulating layers over the first or second set of devices, etching the set of insulating layers thereby forming a set of trenches, depositing a conductive material within the set of trenches, thereby forming a set of metal layers, and forming a portion of a header circuit between a first and a second metal layer. The header circuit is configured to provide the first supply voltage to the first set of devices.