Stacked Inductor With Symmetrical Interlaced Loops
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Solution Overview
Problem
Inductors with high inductance and capable of conducting strong currents while occupying a reduced surface area are difficult to design, especially when formed by metal tracks of different metallization levels, and determining the midpoint of such inductors is challenging due to material and thickness variations across levels.
Innovation Solution
The inductor is formed with a stacking of insulating layers, featuring interlaced loops on multiple metallization levels, where each loop level is symmetrical to the other, ensuring alignment and connection of metal tracks along their entire length, allowing for easy determination and accessibility of the midpoint on the inductor's circumference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the inductor is formed by metal tracks of different metallization levels stacked up, then the inductance increases and surface area decreases, but the ability to conduct strong currents deteriorates
Solution Approach 1:
The patent implements nested loops where inner loops are positioned within outer loops across multiple metallization levels. This nesting arrangement maximizes the use of available space, allowing multiple current paths to occupy the same projected area, thereby achieving high inductance in a compact footprint while maintaining current conduction capability through the stacked structure.
Solution Approach 2:
The patent transitions from a two-dimensional planar inductor to a three-dimensional stacked structure by utilizing multiple metallization levels. This vertical stacking enables the inductor to achieve higher inductance values and better current handling by adding the height dimension, effectively converting the problem from a surface-area constraint to a volumetric solution.
2Area of moving object
If the inductor comprises loops formed by metal tracks of several metallization levels, then the inductance increases, but the difficulty of determining the midpoint increases
Solution Approach 1:
The patent introduces a reference axis that breaks the rotational symmetry of the stacked loops. By defining specific reference points and axes across the different metallization levels, the patent creates an asymmetric reference framework that enables systematic determination of the midpoint position, transforming an otherwise ambiguous geometric problem into a measurable reference-based system.
Data Source
AI summary
An inductor formed in a stacking of insulating layers. The inductor comprises first and second access terminals, at least first and second interlaced loops on a first level, and at least third and fourth interlaced loops on a second level distinct from the first level. The third loop is the symmetrical of the first loop with respect to a plane. The fourth loop is the symmetrical of the second loop with respect to said plane. The internal ends of the first and second loops are connected to the internal ends of the third and fourth loops. The external ends of the first and third loops are connected to the first and second access terminals. The external ends of the second and fourth loops are interconnected.