Helical Stacked Integrated Inductor Reducing Component Area
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Solution Overview
Problem
Inductors and transformers in integrated circuits occupy large areas, necessitating a reduction in size without compromising performance metrics like inductance, quality factor (Q), and coupling coefficient (K).
Innovation Solution
A helical stacked integrated transformer and inductor design featuring two helical coils arranged in a staggered manner, with one coil located in a first plane and the other in a second plane, sharing an overlapped region and having terminals at the outermost turn to reduce complexity and area, while maintaining symmetry and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional integrated inductors and transformers are used, then they can perform signal conversion and impedance matching, but they occupy large areas in the integrated circuit
Solution Approach 1:
The patent transitions from planar spiral inductors to three-dimensional stacked helical coils. The first and second helical coils are positioned at different vertical levels (first plane and second plane), creating a stacked configuration that utilizes the third dimension (vertical stacking) to increase effective inductance area without increasing the planar footprint, thereby reducing component area while maintaining performance
Solution Approach 2:
The patent implements nested positioning where the first inner turn of the first helical coil is surrounded by the first outer turn, and the second helical coil shares an overlapped region with the first helical coil. This nesting arrangement maximizes the use of available space and increases the effective inductance within a compact footprint
2Area of stationary object
If the area of integrated inductors and transformers is reduced, then more components can be integrated, but the performance metrics (inductance, quality factor, coupling coefficient) may degrade
Solution Approach 1:
By stacking helical coils vertically at different planes, the patent increases the effective inductance-generating area in the vertical dimension. This allows achieving higher inductance values and better coupling coefficients without increasing the planar area, thus maintaining performance metrics while reducing footprint
Solution Approach 2:
The patent combines multiple helical coils (first and second helical coils) into a single stacked inductor or transformer component. The coils share overlapped regions and are interconnected to form integrated units, merging multiple inductance-generating elements into one compact component that achieves superior performance metrics
3Reliability
If complex winding structures are used to achieve desired inductance values, then performance can be maintained, but the winding complexity and manufacturing difficulty increase
Solution Approach 1:
The patent uses vertical stacking of helical coils at different planes to achieve desired inductance values without requiring complex planar winding patterns. The three-dimensional arrangement simplifies the winding structure compared to achieving equivalent inductance in a single plane, reducing manufacturing complexity while maintaining 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 significantly reduces component area while maintaining or improving performance by achieving high symmetry and comparable quality factors and inductance values, allowing for efficient signal conversion and impedance matching.
Implementation Method 1
inductors and transformers are important elements in radio frequency integrated circuits to implement single-ended to differential signal conversion, signal coupling and impedance matching
Data Source
AI summary
A helical stacked integrated inductor formed by a first inducing unit and a second inducing unit includes a first helical coil and a second helical coil. The first helical coil is substantially located at a first plane and includes a first outer turn and a first inner turn. The first inner turn is surrounded by the first outer turn. The first helical coil forms a part of the first inducing unit and a part of the second inducing unit. The second helical coil is substantially located at a second plane different from the first plane and overlaps the first helical coil. The second helical coil forms a part of the first inducing unit and a part of the second inducing unit. The first helical coil and the second helical coil are stacked in a staggered arrangement.