Inductor with Reversed Track Sections for Parasitic Capacitance Reduction
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Solution Overview
Problem
Conventional inductors in integrated circuits face challenges in minimizing parasitic capacitance, which limits their resonant frequency and Q-factor, due to capacitance between conductive tracks and the substrate, as well as between inductor turns.
Innovation Solution
The inductor design features a conductive track with crossing points that reverse the order of track sections, reducing the potential difference between adjacent sections and thereby lowering parasitic capacitance, while maintaining self-inductance, resulting in increased resonant frequency and Q-factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional spiral inductor structure is used, then self-inductance is maintained, but parasitic capacitance between inductor turns is high
Solution Approach 1:
The patent applies inversion by reversing the conventional ordering of track sections at crossing points. Instead of maintaining sequential ordering, the conductive track is configured so that adjacent track sections at crossing points have reversed ordering, which reduces the potential difference between them and thereby reduces parasitic capacitance between inductor turns.
Solution Approach 2:
The patent applies local quality by making specific track sections have different configurations based on their position. The crossing points are strategically placed at specific locations along the conductive track where track sections cross over, creating localized regions with reduced potential difference and reduced parasitic capacitance, while maintaining overall inductor performance.
2Reliability
If inductor turns are increased to maintain self-inductance, then parasitic capacitance between turns increases
Solution Approach 1:
The patent applies inversion by reversing the conventional ordering of track sections at crossing points. Instead of maintaining sequential ordering, the conductive track is configured so that adjacent track sections at crossing points have reversed ordering, which reduces the potential difference between them and thereby reduces parasitic capacitance between inductor turns.
3Reliability
If conventional track configuration is used, then manufacturing is simple, but parasitic capacitance limits resonant frequency
Solution Approach 1:
The patent applies segmentation by dividing the conductive track into multiple track sections that are systematically configured. The track is segmented such that crossing points are placed at specific locations where track sections cross over, creating distinct regions with reduced parasitic capacitance. This segmented approach maintains manufacturability while improving performance.
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 effectively reduces parasitic capacitance, leading to higher resonant frequency and Q-factor without affecting self-inductance, and can be implemented in various inductor configurations, including three, four, and five turn inductors, with optimized inner diameters for enhanced performance.
Implementation Method 1
capacitance between the inductor turns themselves
Data Source
Figure 1A~2
Figure 3~6
Figure 7~8
AI summary
An inductor includes a conductive track forming at least three inductor turns. The conductive track has a plurality of track sections. The inductor also includes at least two groups of crossing points, each crossing point comprising a location at which the conductive track crosses over itself. The crossing points of each group collectively reverse the order of at least some of the track sections in the inductor, such that inner track sections of the conductive track cross over to become respective outer track sections, and such that outer track sections of the conductive track cross over to become respective inner track sections.