Semiconductor Element Asymmetric Spiral Coil Layout
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Solution Overview
Problem
Integrated inductors and transformers in semiconductor circuits occupy large areas and have unsatisfactory symmetry, leading to poor performance in terms of quality factor and inductance, making it difficult to connect with differential elements.
Innovation Solution
A semiconductor element comprising two spiral coils connected by a connecting section, with guide segments in a different metal layer, enhancing symmetry and performance by optimizing the layout and metal layer distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional 8-shaped integrated inductor structure is used, then the inductor can be integrated into the circuit, but the symmetry is poor and performance is degraded
Solution Approach 1:
The patent applies asymmetry principle by intentionally designing the connecting section with asymmetric layout relative to the spiral coil, where the connecting section includes metal segments in different metal layers that are positioned asymmetrically to achieve better overall symmetry of the complete inductor structure including both the spiral coil and connecting terminals
2Ease of operation
If the two connecting terminals are placed at the ends of spiral coils, then the inductor structure is formed, but the terminals are distant from each other making connection with differential elements difficult
Solution Approach 1:
The patent applies dimensionality change by utilizing multiple metal layers to position the connecting terminals. The connecting section includes metal segments in different metal layers that overlap or are positioned closer in the vertical dimension, thereby reducing the horizontal distance between terminals and facilitating connection with differential elements
3Quantity of substance
If spiral coils with many turns are used to increase inductance, then the inductance value increases, but the area occupied increases and terminal distance increases
Solution Approach 1:
The patent applies dimensionality change by using multiple metal layers for the connecting section. The metal segments in different layers can overlap vertically, allowing the terminals to be positioned closer together in the horizontal plane while maintaining the required inductance value through the spiral coil design
Data Source
AI summary
A semiconductor element includes a first spiral coil, a second spiral coil, a connecting section, a first guide segment, and a second guide segment. The first spiral coil is formed with a first end and a second end, and includes a first inner turn and a first outer turn. The first inner turn is located in a range surrounded by the outer turn, and the first end and the second end are located at the first inner turn. The second spiral coil and the first spiral coil are located in substantially a same metal layer. The connecting section connects the first spiral coil and the second spiral coil. The first guide segment is connected to the first end. The second guide segment is connected to the second end. The first guide segment and the second guide segment are fabricated in a metal layer different from a metal layer of the first spiral coil.