Asymmetric Integrated Inductor Q Factor
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Solution Overview
Problem
Current inductor designs in integrated circuits face challenges in achieving a high Q factor, particularly for eight-shaped inductors, which are difficult to form effectively due to their symmetric electrical characteristics and offset magnetic fields.
Innovation Solution
The integrated inductor design comprises two coils with different numbers of turns in distinct areas, ensuring electrical symmetry and allowing input/output ports and a center tap to be disposed on the same side, enhancing the Q factor by modifying the inductance value through turn adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an eight-shaped inductor is used with symmetric electrical characteristics and offset magnetic fields, then the inductor introduces fewer impacts on other parts and is difficult to be influenced by coupling, but it is difficult to form an eight-shaped inductor with good Q factor
Solution Approach 1:
The patent applies asymmetry by configuring the first and second coils with different numbers of turns in different areas. Specifically, the first coil has a first number of turns in a first area and a second number of turns in a second area, while the second coil has a third number of turns in the first area and a fourth number of turns in the second area, where these numbers are all different. This asymmetric configuration allows the inductor to maintain low coupling impact while achieving good Q factor performance.
Solution Approach 2:
The patent applies local quality by optimizing the turn distribution of coils in different areas independently. The first coil has different turn counts in the first area versus the second area, and similarly for the second coil. This localized optimization allows each area to contribute differently to the overall inductance and Q factor, resolving the contradiction between low coupling impact and high Q factor.
2Reliability
If the number of turns in different areas is made different for each coil, then the Q factor is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the inductor into two distinct coils (first coil and second coil), each with turns distributed across two distinct areas (first area and second area). This segmentation allows independent optimization of turn counts in different regions, achieving improved Q factor while maintaining manageable device complexity through modular coil structures.
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 configuration improves the Q factor of the inductor, outperforming prior art designs by maintaining electrical symmetry and enhancing performance, especially at higher frequencies.
Implementation Method 1
The first coil has at least one first turn disposed in a first area and at least one second turn disposed in a second area... The second coil has at least one third turn disposed in the first area and at least one fourth turn disposed in the second area
Data Source
AI summary
An integrated inductor includes a first coil and a second coil. The first coil has at least one first turn disposed in a first area and at least one second turn disposed in a second area, a number of the at least one first turn is different from a number of the at least one second turn. The second coil has at least one third turn disposed in the first area and at least one fourth turn disposed in the second area, a number of the at least one third turn is different from a number of the at least one fourth turn. The number of the at least one first turn is different from the number of the at least one third turn, and the number of the at least one second turn is different from the number of the at least one fourth turn.