Inductor Layout With Intersecting Null Lines for Low Magnetic Coupling
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Solution Overview
Problem
As semiconductor devices miniaturize and circuitry speeds increase, unwanted magnetic coupling between inductors in integrated circuitry becomes a significant challenge, affecting accuracy and causing issues like frequency pulling, spurs, distortion, and phase pulling due to strong magnetic field interactions.
Innovation Solution
The inductor arrangement features pairs of driven inductors configured to generate magnetic fields that are substantially in antiphase, with their null lines intersecting, and the use of auxiliary loops to induce counteracting magnetic fields, reducing or eliminating magnetic coupling between inductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If inductors are placed in close proximity in integrated circuitry to achieve miniaturization, then device size is reduced, but magnetic coupling between inductors increases causing frequency pulling, spurs, distortion, and phase pulling
Solution Approach 1:
The patent introduces auxiliary loops as intermediary elements positioned between driven inductors. These auxiliary loops generate magnetic fields that act as mediators to cancel the harmful magnetic coupling between adjacent inductors. The auxiliary loops are driven by signals derived from the driven inductors' signals, creating counteracting magnetic fields that reduce the net magnetic coupling effect.
Solution Approach 2:
The patent applies preliminary anti-action by generating counteracting magnetic fields through auxiliary loops before the harmful magnetic coupling fully affects the circuit operation. The auxiliary loops are driven in advance with signals that produce magnetic fields opposing the coupling fields, thereby preemptively neutralizing the harmful effects of magnetic coupling.
2Device complexity
If traditional inductor layouts are used in integrated circuitry, then device complexity is low, but magnetic interference causes frequency pulling and phase pulling that degrades circuit accuracy
Solution Approach 1:
The patent segments the magnetic field management function by separating the driven inductors from auxiliary loops. Each inductor is paired with dedicated auxiliary loops that independently manage magnetic coupling for that specific inductor. This segmentation allows precise control of magnetic fields for each inductor pair, improving circuit accuracy while maintaining manageable complexity through modular organization.
Solution Approach 2:
The auxiliary loops serve multiple functions: they generate counteracting magnetic fields to reduce coupling, are driven by derived signals from the circuit, and can be integrated into the existing inductor layout. This multi-functionality allows a single auxiliary loop structure to address multiple aspects of magnetic interference management.
3Object-affected harmful factors
If auxiliary loops are added to reduce magnetic coupling, then magnetic interference is reduced, but device complexity and number of components increase
Solution Approach 1:
The patent merges the auxiliary loops with the existing inductor structure and driving circuitry. The auxiliary loops are driven by signals derived from the driven inductors' signals, combining multiple functions into integrated structures. This merging reduces the need for completely separate control circuits and minimizes the overall component count while still achieving magnetic coupling reduction.
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 configuration significantly reduces magnetic coupling, maintaining phase quadrature in I/Q circuits and improving the accuracy and stability of integrated circuit operations by canceling out or minimizing unwanted magnetic interference.
Implementation Method 1
a first pair of driven inductors configured to be driven to generate magnetic fields which are substantially in antiphase
Implementation Method 2
arranged relative to one another so that their magnetic fields substantially cancel one another at a first null line between those inductors
Implementation Method 3
an auxiliary loop, being a closed (or endless) AC and/or DC current path... a current is induced in the auxiliary loop by the driven magnetic field
Data Source
AI summary
An inductor arrangement, comprising: a first pair of driven inductors configured to be driven to generate magnetic fields which are substantially in antiphase, and arranged relative to one another so that their magnetic fields substantially cancel one another at a first null line between those inductors; and a second pair of driven inductors configured to produce magnetic fields which are substantially in antiphase, and arranged relative to one another so that their magnetic fields substantially cancel one another at a second null line between those inductors, wherein the pairs of driven inductors are arranged relative to one another so that the first and second null lines intersect one another, with the first pair of driven inductors located substantially on the second null line and the second pair of inductors located substantially on the first null line.