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Proceedings ArticleDOI

Reciprocity Theorem Based RFI Estimation for Heatsink Emission

Qiaolei Huang, +7 more
- pp 590-594
TLDR
The heatsink RFI problems are analyzed by two methods using reciprocity theorem, which can be characterized in both the source side and the antenna side on a closed 6-surface box.
Abstract: 
Heatsinks are widely used to dissipate heat in electronic devices. RF emission from heatsinks and ICs can cause radio frequency interference (RFI) issues. The existence of the heatsink affects the coupling from the noise source to the victim antenna. In this paper, the heatsink RFI problems are analyzed by two methods using reciprocity theorem. In the first method, the heatsink effect is combined with the antenna to derive the transfer function. In the second method, the heatsink can be characterized in both the source side and the antenna side on a closed 6-surface box. The physical insights and comparisons of the two RFI estimation methods based on reciprocity theorem will be investigated. The proposed methods will be utilized on a few numeric simulations for validations.

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Citations
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Journal ArticleDOI

Identifying Interference From Multiple Noise Sources Using Only Magnetic Near Fields

Jingnan Pan, +2 more
- 01 Apr 2021 - 
TL;DR: In this article, a decomposition method based on the reciprocity theory was employed to calculate the interference contribution from different sources and to identify the dominant noise source even when multiple sources radiate simultaneously.
Journal ArticleDOI

Radio-Frequency Interference Estimation for Multiple Random Noise Sources

- 01 Apr 2022 - 
TL;DR: In this paper , a vector network analyzer was used to reconstruct multiple random noise sources on a real-world product, including several double-data-rate (DDR) memory modules and a high-speed connector.
Journal ArticleDOI

A SPICE-Compatible Model to Simulate RFI-Induced Buzz Noise Problem in a Camera

Wei Zhang, +7 more
- 01 Aug 2022 - 
TL;DR: Based on the reciprocity theorem, the proposed SPICE-compatible model consists of cascaded scattering (S) parameters extracted from the field coupling, which can provide an accurate estimation of the buzz noise transfer function (TFtotal) between the radio-frequency antenna and the audio system within an average error of 1 dB as discussed by the authors .
Proceedings ArticleDOI

Radiated Noise Source Characterization Based on Magnitude-Only Near Field

Ze Sun, +4 more
TL;DR: In this article, a fast and accurate method to extract equivalent dipole moments of radiated noise sources is proposed, which uses the genetic algorithm to optimize the position and type of dipoles, and also uses a back-and-forth iteration algorithm to retrieve phase based on the magnitude information of two observation planes with different heights.
Proceedings ArticleDOI

Root Cause Analysis for the Phase Noise of the Clock Generator

Yuanzhuo Liu, +8 more
TL;DR: In this article, the root cause of phase noise of the clock output at the resonance frequency is analyzed and identified and the main sources of the phase noise are the power supply, the heat sink, and the external crystal.
References
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Journal ArticleDOI

Estimating Radio-Frequency Interference to an Antenna Due to Near-Field Coupling Using Decomposition Method Based on Reciprocity

Hanfeng Wang, +3 more
- 08 Mar 2013 - 
TL;DR: In this article, an effective methodology is proposed to estimate the RF interference received by an antenna due to near-field coupling, which is one of the common noise-coupling mechanisms, using decomposition method based on reciprocity.
Journal ArticleDOI

Physics-Based Dipole Moment Source Reconstruction for RFI on a Practical Cellphone

Qiaolei Huang, +5 more
- 05 Jun 2017 - 
TL;DR: In this paper, a physics-based dipole moment source reconstruction was proposed to estimate the near-field coupling between a liquid crystal display panel to a cellphone's cellular antenna, based on the understanding of the current distribution on the source.
Journal ArticleDOI

Radiated EMI Estimation From DC–DC Converters With Attached Cables Based on Terminal Equivalent Circuit Modeling

Satyajeet Shinde, +6 more
- 01 Dec 2018 - 
TL;DR: An equivalent two terminal model based on the Thevenin equivalents describes the common mode (CM) currents on the input and output side of two widely used types of dc-to-dc power converters as mentioned in this paper.
Journal ArticleDOI

Maximum Radiated Emissions Evaluation for the Heatsink/IC Structure Using the Measured Near Electrical Field

Guangyao Shen, +5 more
- 06 Apr 2017 - 
TL;DR: In this paper, the maximum radiated emissions for a heat-sink/IC structure is predicted by creating an equivalent source from the measured electrical field (E-field) in the gap between the heatsink and IC.
Proceedings ArticleDOI

IC placement optimization for RF interference based on dipole moment sources and reciprocity

Chulsoon Hwang, +1 more
TL;DR: In this article, a method to optimize the IC placement in mobile devices from RF interference perspective is proposed, where the coupling from the IC to an antenna is estimated by combining the equivalent dipole moment source and reciprocity, which facilitates understanding of coupling physics and design insight for the mobile devices.