Planar Transformer Coil Layout for Balanced RF Signal Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing transformer devices for radio frequency signal conversion face challenges in achieving excellent coupling, higher quality factor, and improved line balancing, particularly in applications requiring signal conversion between common mode and differential mode.
Innovation Solution
A planar transformer device comprising three coils with mirror-symmetric ring structures and connecting portions, where the coils are configured to couple signals in opposite directions to reduce noise coupling and enhance impedance matching, allowing for better wire balancing and improved signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional coil structures are used for signal conversion, then device simplicity is maintained, but coupling performance and line balancing deteriorate
Solution Approach 1:
The first coil is segmented into multiple ring structures (first ring structure, second ring structure, third ring structure) connected through connecting portions. This segmentation allows each ring to contribute to the overall coupling performance while maintaining a manageable structural complexity through systematic arrangement.
Solution Approach 2:
Multiple ring structures are merged into a single coil unit with shared terminals and connecting portions. The first coil combines multiple rings that work together to achieve enhanced coupling performance, while the second and third coils are merged in a symmetric configuration to improve line balancing.
2Reliability
If coil structures are optimized for higher quality factor, then signal transmission quality improves, but manufacturing complexity increases
Solution Approach 1:
The first coil exhibits asymmetric internal structure with multiple rings of different configurations connected through connecting portions, while maintaining symmetric external terminals. This asymmetric design within symmetric boundaries enables optimized quality factor while preserving manufacturing simplicity through standardized terminal connections.
Solution Approach 2:
Different ring structures within the first coil have locally optimized geometries and connections tailored to enhance specific aspects of coupling and quality factor. Each ring portion can be independently optimized for its local function while contributing to the overall coil performance.
3Reliability
If symmetric coil configurations are used, then line balancing improves, but noise coupling increases
Solution Approach 1:
The symmetric configuration of the second and third coils, which could potentially cause noise coupling, is strategically designed to create magnetic field cancellation effects. The opposing windings and symmetric positioning convert what would be harmful noise coupling into beneficial noise rejection, improving line balancing while mitigating interference.
4Reliability
If multiple ring structures are connected in opposite directions, then impedance matching improves, but structural complexity increases
Solution Approach 1:
The connecting portions are designed to maintain equipotential relationships between different ring structures at critical connection points. By ensuring equal potential at junctions where rings connect in opposite directions, the design achieves improved impedance matching while the connecting portions themselves are kept simple and standardized.
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
The transformer device achieves better line balancing and noise reduction, enabling effective power combining and signal conversion, with higher quality factor and lower resistance, suitable for applications like power amplifiers and antenna interfaces.
Implementation Method 1
A BALUN is usually utilized in this kind of signal conversion. A BALUN is one of many applications of a transformer, and is implemented with coil(s) in the ICs.
Data Source
AI summary
A transformer device includes a first coil, a second coil, and a third coil. The first coil includes a first ring structure, a second ring structure, a first connecting portion, and a first terminal, in which the first terminal is arranged on the first connecting portion and is located at a central location between the first ring structure and the second ring structure, the first terminal is connected to the first ring structure through the first connecting portion in a first direction, and connected to the second ring structure through the first connecting portion in a second direction, and the first direction is the opposite of the second direction. The second coil is configured to couple the first ring structure. The third coil is configured to couple the second ring structure, in which the second coil and the third coil have the same structure.