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Article
A Methodology For Predicting Acoustic Noise From Singing Capacitors In Mobile Devices
IEEE Transactions on Electromagnetic Compatibility
  • Xin Yan
  • Jianmin Zhang
  • Songping Wu
  • Ming Feng Xue
  • Chi Kin Benjamin Leung
  • Eric A. MacIntosh
  • Daryl G. Beetner, Missouri University of Science and Technology
Abstract

Multilayer ceramic capacitors (MLCCs) connected to a power distribution network (PDN) can create acoustic noise through a combination of the power rail noise at the MLCCs and the piezoelectric effect of the capacitor's ceramic material. The deformation of the MLCCs brought on by power supply noise creates vibrations which cause the printed circuit board (PCB) to vibrate and generate the audible acoustic noise. In the following paper, a simulation methodology is presented to analyze the acoustic noise created by MLCCs on a PCB. A simulation model for the PCB vibration modal response is built and the modal superposition method is used to analyze the harmonic response of the PCB excited by the capacitor. By multiplying the measured power noise spectrum on the MLCC with the simulated deformation of the PCB found from the harmonic response analysis, the total response is obtained. Simulated results show a good correlation with the measured acoustic noise. The proposed method shows promise for analyzing and predicting the acoustic noise from singing capacitors.

Department(s)
Electrical and Computer Engineering
Keywords and Phrases
  • Acoustic noise,
  • harmonic response,
  • modal analysis,
  • multilayer ceramic capacitors,
  • piezoelectric effect
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2023 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
1-1-2023
Publication Date
01 Jan 2023
Citation Information
Xin Yan, Jianmin Zhang, Songping Wu, Ming Feng Xue, et al.. "A Methodology For Predicting Acoustic Noise From Singing Capacitors In Mobile Devices" IEEE Transactions on Electromagnetic Compatibility (2023) ISSN: 1558-187X; 0018-9375
Available at: http://works.bepress.com/daryl-beetner/135/