Multi-Loop Inductor Magnetic Field Cancellation for Clock Recovery
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Solution Overview
Problem
In multi-channel digital communication systems, electromagnetic field interference affects the accuracy of clock recovery in receivers, leading to timing jitter and intersymbol interference, which complicates the recovery of digital data, especially at high symbol rates.
Innovation Solution
Integrated circuits with loop inductors designed to minimize electromagnetic interference, featuring multiple non-overlapping loops that cancel out magnetic fields, including central and peripheral loops with specific orientations and symmetries, are used in clock recovery modules within multi-channel receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single-loop inductors are used in clock recovery modules, then the device complexity is low, but electromagnetic field interference causes timing jitter and reduces clock recovery precision
Solution Approach 1:
The inductor is divided into multiple non-overlapping loops (at least two loops) with different areas, where each loop contributes to the overall inductance while generating magnetic fields that partially cancel each other. This segmentation reduces the net electromagnetic field interference while maintaining the required inductance value for clock recovery operations.
Solution Approach 2:
The patent employs loops with asymmetric area distribution (at least one loop having a different area from the others) to optimize the cancellation of magnetic fields. The asymmetric configuration allows for tailored magnetic field distribution that minimizes interference with adjacent clock recovery modules while maintaining electrical performance.
2Object-affected harmful factors
If multiple non-overlapping loops with different areas are used to reduce electromagnetic interference, then electromagnetic field interference is reduced, but the device complexity increases
Solution Approach 1:
Multiple loop structures are merged into a single integrated inductor component that provides both the required inductance and reduced electromagnetic interference. The loops are electrically connected to function as a unified inductor element, combining the interference-reduction benefits of multiple loops with the simplicity of a single device component.
Solution Approach 2:
The multi-loop inductor structure serves multiple functions simultaneously: it provides the necessary inductance for clock recovery, reduces electromagnetic field interference through magnetic field cancellation, and maintains compatibility with standard integrated circuit fabrication processes. This multi-functionality reduces the need for additional interference-mitigation components.
3Reliability
If inductors with reduced electromagnetic field interference are used, then timing jitter is reduced and clock recovery stability improves, but manufacturing complexity increases
Solution Approach 1:
The patent modifies the geometric parameters of the inductor loops (areas, configurations, and arrangements) to achieve electromagnetic field cancellation while maintaining compatibility with standard semiconductor fabrication processes. By adjusting loop areas and configurations rather than fundamental structure, the design achieves improved performance using existing manufacturing capabilities.
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
These designs significantly reduce electromagnetic field interference, enhancing the stability and precision of clock recovery, thereby improving the signal-to-noise ratio and reducing timing errors in high-speed digital communication systems.
Implementation Method 1
each peripheral loop defining a peripheral magnetic dipole oriented opposite the central magnetic dipole, the plurality of peripheral loops substantially canceling a field from the central magnetic dipole
Data Source
AI summary
Integrated circuits such as multi-channel receivers may require loop inductors resistant to electromagnetic field interference. Such loop inductors may include multiple non-overlapping loops each defining a corresponding dipole, the multiple dipoles summing to zero, with at least one of said loops having unequal areas. The multiple non-overlapping loops may include: a center loop defining a central magnetic dipole; and a plurality of peripheral loops equally spaced around a perimeter of the center loop, each peripheral loop defining a peripheral magnetic dipole oriented opposite the central magnetic dipole, the plurality of peripheral loops substantially canceling a field from the central magnetic dipole. The total number of loops may be odd, with particular embodiments of three, five, and seven loop designs disclosed. Single and multi-turn embodiments are provided.