Transforming Circuit With Selective Magnetic Coupling
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Solution Overview
Problem
Conventional transformer baluns are designed for specific frequency bands, requiring multiple baluns in multi-mode communication systems, which occupy significant space and increase manufacturing costs.
Innovation Solution
A transforming circuit with a primary winding and multiple secondary windings, along with switches and a switch controller, allows for the selective coupling of differential and single-ended signals across different frequency bands, enabling a single circuit to handle multiple frequency bands without the need for multiple baluns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transformer baluns are used for different frequency bands, then signal transformation for each band is optimized, but the circuit area and manufacturing cost increase significantly
Solution Approach 1:
The patent combines multiple transformer balun functions into a single integrated circuit by using one primary winding that can be magnetically coupled with different secondary windings for different frequency bands. This merging approach maintains optimal signal transformation for each band while significantly reducing the total circuit area compared to using separate baluns for each frequency band.
Solution Approach 2:
The primary winding is designed to serve multiple functions by being able to magnetically couple with different secondary windings corresponding to different frequency bands. This universal design allows a single transformer structure to handle multiple frequency bands (e.g., LTE FDD, TDD, Wi-Fi) without requiring separate dedicated baluns for each band.
2Reliability
If multiple transformer baluns are used for different frequency bands, then signal transformation for each band is optimized, but manufacturing cost increases
Solution Approach 1:
By merging multiple balun functions into a single integrated transformer structure with one primary winding and multiple selectable secondary windings, the patent reduces the total number of components that need to be manufactured and assembled. This consolidation directly lowers manufacturing costs while maintaining optimal signal transformation quality for each frequency band through dedicated magnetic coupling paths.
3Area of stationary object
If a single transformer balun is used for multiple frequency bands, then circuit area is reduced, but coupling coefficient performance deteriorates outside the specific frequency band
Solution Approach 1:
The patent segments the transformer structure into one primary winding and multiple secondary windings, each optimized for specific frequency bands. Switching mechanisms allow the system to select the appropriate secondary winding for the current operating band, ensuring optimal coupling coefficient for each segment (frequency band) while maintaining a compact single-integrator structure.
Solution Approach 2:
The patent introduces dynamic switching capability that allows the transformer to adapt its magnetic coupling configuration based on the operating frequency band. This dynamic reconfiguration ensures that the coupling coefficient remains optimal across different frequency bands by selectively activating the appropriate secondary winding for each band, rather than using a fixed single-tuned structure.
4Reliability
If multiple transformer baluns are installed in the system, then each frequency band has dedicated optimization, but device complexity increases
Solution Approach 1:
The patent merges multiple dedicated balun functions into a single integrated transformer structure with common primary winding and multiple secondary windings. This consolidation reduces device complexity by eliminating redundant components and interconnections while maintaining frequency band optimization through selective magnetic coupling, thereby simplifying the overall system architecture.
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 solution reduces the number of transformer baluns required, saving space and cost while maintaining optimal coupling coefficients for each frequency band, allowing for efficient signal transformation in multi-mode communication systems.
Implementation Method 1
a first winding and a plurality of second windings. The first winding has a first port and a second port operably coupled for a differential signal. Each of the plurality of second windings has a third port and a fourth port operably coupled for a single-ended signal when magnetically coupled to the first winding.
Data Source
AI summary
A transforming circuit includes: a first winding having a first port and a second port operably coupled for a differential signal; and a plurality of second windings, each having a third port and a fourth port operably coupled for a single-ended signal when magnetically coupled to the first winding. When one of the second windings is magnetically coupled to the first winding, each remaining second winding(s) is not magnetically coupled to the first winding.