Pseudo-8-Shaped Inductor Layout for IC Coupling Reduction
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Solution Overview
Problem
Inductors in integrated circuits face challenges with increased couplings between components, leading to interference, reduced quality factor, and self-resonant frequency, due to their design which complicates layout and increases resistance.
Innovation Solution
A pseudo-8-shaped inductor design is implemented, where coil portions are connected in a twisted arrangement to generate magnetic fields of equal strength but opposite directions, reducing couplings and simplifying layout complexity by minimizing crosses in the winding, thus reducing resistance and parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional inductor design is used, then inductance is achieved, but coupling between components increases leading to interference and reduced quality factor
Solution Approach 1:
The inductor uses a pseudo-8-shaped asymmetric layout where the first and second coil portions are positioned at different locations on the substrate rather than symmetrically. This asymmetric arrangement reduces magnetic coupling with other circuit components while maintaining the required inductance value, thereby reducing interference and improving quality factor
Solution Approach 2:
The patent transitions from planar spiral inductor designs to a pseudo-8-shaped configuration that utilizes spatial distribution in multiple dimensions. The coil portions are arranged to create magnetic fields that cancel each other in certain directions, reducing coupling interference with components in adjacent layers or nearby positions on the substrate
2Reliability
If traditional inductor design is used, then inductance is achieved, but self-resonant frequency is reduced
Solution Approach 1:
The inductor is segmented into distinct first and second coil portions that are separately positioned and connected through a bridge. This segmentation allows each portion to be optimized independently for minimizing parasitic capacitance and inductance, thereby increasing self-resonant frequency while keeping the overall layout manageable through systematic connection
3Reliability
If traditional inductor design is used, then inductance is achieved, but resistance increases
Solution Approach 1:
The patent employs a three-dimensional stacked configuration where the first and second coil portions are positioned at different vertical or lateral positions on the substrate, connected via vias or bridge structures. This spatial separation reduces the total wire length and number of interconnections required, thereby reducing resistive losses while maintaining inductance through optimized geometric arrangement
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 design enhances the quality factor and self-resonant frequency of inductors, reduces interference with other components, and allows for more compact implementation on silicon area, improving overall circuit performance.
Implementation Method 1
The first coil portion and the second coil portion are arranged to generate magnetic fields having substantially equal strength and opposite directions
Data Source
AI summary
Aspects of the disclosure provide a device that includes a first inductor. The first inductor includes a first coil portion having more than one turn that defines a first enclosed area and a second coil portion having more than one turn that defines a second enclosed area. The first coil portion and the second coil portion are arranged to generate magnetic fields having substantially equal strength and opposite directions.