Integrated Transformer Sub-Coil Layout for Magnetic Field Cancellation
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Solution Overview
Problem
Integrated transformers in circuit systems suffer from performance limitations due to interference magnetic fields generated by their spiral structure, which worsen at high frequencies, affecting their voltage and impedance conversion capabilities.
Innovation Solution
The transformer design includes sub-coils arranged in a configuration where the magnetic fields formed by each sub-coil pass through the layout plane in different directions, either by using cross structures or non-cross structures, allowing the fields to cancel each other out while maintaining effective voltage or impedance conversion functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a spiral structure is used for the coil, then the transformer can be integrated into a chip, but an interference magnetic field is generated that worsens performance at high frequencies
Solution Approach 1:
The coil is divided into multiple sub-coils (first sub-coil, second sub-coil, third sub-coil) that are magnetically coupled. Each sub-coil generates a magnetic field in a different direction, and the combined effect cancels out the interference magnetic field while maintaining the integrated spiral structure on the chip.
Solution Approach 2:
The sub-coils are arranged with asymmetric orientations relative to the chip substrate. The first sub-coil has a first orientation, the second sub-coil has a second orientation different from the first, and the third sub-coil has a third orientation different from both. This asymmetric arrangement ensures that magnetic fields are generated in different directions, enabling interference cancellation while preserving integration capability.
2Object-affected harmful factors
If sub-coils are arranged to cancel magnetic fields, then interference is suppressed, but the device complexity increases
Solution Approach 1:
Multiple sub-coils with different orientations are merged into a single integrated coil structure that can be fabricated on the same chip substrate. The sub-coils share common magnetic coupling paths and are designed to work together as a unified transformer component, reducing the overall device complexity compared to using separate cancellation coils.
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 suppresses interference magnetic fields, enhancing the transformer's performance and reducing adverse impacts, particularly at high frequencies, thereby improving the transformer's overall efficiency and functionality within integrated circuit systems.
Implementation Method 1
the first sub-coil 11A generates, in an area surrounded by the first sub-coil 11A, a first magnetic field that is perpendicular to the layout plane 100 and that is in a downward direction, and the second sub-coil 11B generates, in an area surrounded by the second sub-coil 11B, a second magnetic field that is perpendicular to the layout plane 100 and that is in an upward direction
Implementation Method 2
a first magnetic field formed by the first sub-coil passes through a layout plane of the transformer in a first manner, a second magnetic field formed by the second sub-coil passes through the layout plane in a second manner, the first manner includes passing in from a first surface of the layout plane and passing out from a second surface of the layout plane, and the second manner includes passing in from the second surface and passing out from the first surface
Data Source
AI summary
A transformer, including a first coil and a second coil. The first coil is magnetically coupled to the second coil. At least one of the first coil and the second coil includes a plurality of sub-coils, and the plurality of sub-coils include a first sub-coil and a second sub-coil. A first magnetic field formed by the first sub-coil passes through a layout plane of the transformer in a first manner, and a second magnetic field formed by the second sub-coil passes through the layout plane in a second manner. The first manner includes passing in from a first surface of the layout plane and passing out from a second surface of the layout plane, and the second manner includes passing in from the second surface and passing out from the first surface.