Integrated Inductor Isolation Module for IC Power Rails
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Solution Overview
Problem
Integrated circuits with multiple functional domains face challenges in power signal management due to varying power requirements and signal noise sensitivities, leading to increased power consumption and larger package sizes, which are unsustainable for mobile and small devices.
Innovation Solution
The implementation of integrated inductors, such as coil inductors and plated-through-hole (PTH) inductors, between power rails to provide customized filtering and isolation, optimizing inductance and resistance characteristics to manage power signal noise and reduce package size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple functional domains are integrated into a single chip to reduce package size, then package size is reduced, but power signal noise and power consumption increase
Solution Approach 1:
The power distribution network is segmented into multiple isolated power domains, each serving specific functional blocks. Isolation modules with inductors are inserted between power rails to create electrical separation, preventing noise propagation between domains while maintaining physical integration on the same chip.
Solution Approach 2:
Inductors are introduced as intermediary elements between power rails and consumer circuits. These inductors act as noise filters that block high-frequency noise while allowing DC power to pass through, thereby mediating between the power supply and noise-sensitive circuits.
2Area of stationary object
If multiple functional domains are integrated into a single chip to reduce package size, then package size is reduced, but power consumption increases
Solution Approach 1:
The power distribution network is segmented into multiple isolated power domains, each serving specific functional blocks. Isolation modules with inductors are inserted between power rails to create electrical separation, preventing noise propagation between domains while maintaining physical integration on the same chip.
Solution Approach 2:
Different power domains are created with customized filtering characteristics tailored to the specific noise sensitivity and power requirements of each functional block. Each domain receives optimized power delivery according to its local requirements rather than a uniform approach.
3Object-generated harmful factors
If inductors are added between power rails to provide filtering and isolation, then power signal noise is reduced, but device complexity increases
Solution Approach 1:
Multiple inductors are merged into a single integrated inductor structure that serves multiple power rails simultaneously. This consolidated approach reduces the total component count and interconnect complexity while maintaining the isolation and filtering functionality across multiple domains.
Solution Approach 2:
The isolation modules are designed with universal characteristics that allow them to serve multiple functions: power filtering, noise isolation, and domain separation. This multi-functionality reduces the need for separate dedicated components for each function.
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 approach effectively reduces power consumption and package size by isolating noise-sensitive circuits, achieving aggressive power scaling and meeting form factor requirements for smaller, thinner, and lighter devices while maintaining functionality.
Implementation Method 1
An inductor generally comprises a conductor that is configured to store energy in a magnetic field adjacent to the conductor when a current passes through the conductor
Implementation Method 2
A conductor comprising a portion of the inductor typically includes one or more turns that can concentrate a magnetic field, induced by a current flowing through the conductor, in an area near the conductor
Data Source
AI summary
An integrated circuit (IC) can include multiple power domains that are served by a common power source. In an example, a first IC power rail can be coupled to the source and a first consumer circuit. A second IC power rail can be coupled to a second consumer circuit. The second IC power rail can receive a filtered power signal from an isolation module that is coupled between the first and second power rails. In an example, an isolation module includes an integrated inductor and a capacitor (e.g., a land-side capacitor). The integrated inductor can optionally include multiple spaced apart conductive layers that are electrically coupled. The integrated inductor can optionally include a series of conductive traces and plated through holes or vias that together provide a current path with multiple turns.