Magnetically Differential Inductor for RF Interference Reduction
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Solution Overview
Problem
In circuits, particularly in RF transceivers, interference between inductors and other components is a challenge due to the sensitivity of these components and the need to meet specific noise and emission standards, making it difficult to integrate components into single ICs while minimizing interference.
Innovation Solution
The use of magnetically differential inductors, where two or more conductive loops are configured such that current flows in opposite directions to partially cancel magnetic fields, reducing interference and optimizing magnetic cancellation based on the relative positions of the inductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional inductors are used in RF transceivers, then the transceiver can be integrated into a single IC, but interference between inductors and other components increases
Solution Approach 1:
The inductor is divided into multiple conductive loops (e.g., two or more loops) that are configured to generate magnetic fields in opposite directions. This segmentation allows the magnetic fields to cancel each other out, reducing interference with other circuit components while maintaining the inductive function needed for RF transceiver operation.
Solution Approach 2:
The patent applies the counterweight principle by configuring conductive loops to generate magnetic fields that oppose and cancel each other. The magnetic field from one loop acts as a counterweight to the magnetic field from another loop, reducing the net magnetic interference emitted by the inductor structure integrated on the IC.
2Object-affected harmful factors
If inductors are configured to cancel magnetic fields, then interference with other components is reduced, but the complexity of the inductor structure increases
Solution Approach 1:
Multiple conductive loops are merged into a single integrated inductor structure that functions as one component. The loops are coupled together (in series or parallel) to achieve the desired inductance value while providing magnetic field cancellation, combining the functions of multiple elements into a unified structure that can be fabricated as a single IC component.
Solution Approach 2:
The magnetically differential inductor structure serves multiple functions simultaneously: it provides the necessary inductance for RF transceiver operation, cancels magnetic field interference with other components, and maintains a compact form factor suitable for IC integration. This multi-functionality reduces the need for additional separate components.
3Reliability
If magnetically differential inductors are used, then interference is minimized and sensitive components can be integrated, but the inductor design becomes more complex
Solution Approach 1:
The magnetic field cancellation is optimized for specific locations around the inductor structure. The conductive loops are configured and positioned to achieve maximum magnetic field cancellation at critical locations where sensitive components are located, rather than attempting uniform cancellation in all directions. This localized optimization reduces interference where it matters most while simplifying the overall design.
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 approach effectively minimizes interference between circuit components, allowing for the integration of sensitive components in RF transceivers while meeting performance standards, thereby enabling the development of highly integrated, low-cost, and low-form-factor RF apparatuses.
Implementation Method 1
two or more conductive loops configured such that current flows in opposite directions through some of the loops to at least partially cancel magnetic fields generated from the loops
Data Source
AI summary
A method and apparatus is provided for use in an integrated circuit or printed circuit board for reducing or minimizing interference. An inductance is formed using two or more inductors coupled together and configured such that current flows through the inductors in different directions, thus at least partially canceling magnetic fields. When designing a circuit, the configuration of the inductors, as well as the relative positions of portions of the circuit, can be tweaked to provide optimal interference or noise control.