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“Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review

Multilayer Ceramic Capacitors (MLCC) have a major role in modern electronic devices due to their small price and size, large range of capacitance, small ESL and ESR, and good frequency response. Unfortunately, the main dielectric material used for MLCCs, Barium Titanate, makes the capacitors vibrate...

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Detalles Bibliográficos
Autores principales: Covaci, Corina, Gontean, Aurel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9147252/
https://www.ncbi.nlm.nih.gov/pubmed/35632278
http://dx.doi.org/10.3390/s22103869
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author Covaci, Corina
Gontean, Aurel
author_facet Covaci, Corina
Gontean, Aurel
author_sort Covaci, Corina
collection PubMed
description Multilayer Ceramic Capacitors (MLCC) have a major role in modern electronic devices due to their small price and size, large range of capacitance, small ESL and ESR, and good frequency response. Unfortunately, the main dielectric material used for MLCCs, Barium Titanate, makes the capacitors vibrate due to the piezoelectric and electrostrictive effects. This vibration is transferred to the PCB, making it resonate in the audible range of 20 Hz–20 kHz, and in this way the singing capacitors phenomenon occurs. This phenomenon is usually measured with a microphone, to measure the sound pressure level, or with a Laser Doppler Vibrometer (LDV), to measure the vibration. Besides this, other methods are mentioned in the literature, for example, the optical fiber and the active excitation method. There are several solutions to attenuate or even eliminate the acoustic noise caused by MLCC. Specially designed capacitors for low acoustic levels and different layout geometries are only two options found in the literature. To prevent the singing capacitor phenomenon, different simulations can be performed, the harmonic analysis being the most popular technique. This paper is an up-to-date review of the acoustic noise caused by MLCCs in electronic devices, containing measurements methodologies, solutions, and simulation methods.
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spelling pubmed-91472522022-05-29 “Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review Covaci, Corina Gontean, Aurel Sensors (Basel) Review Multilayer Ceramic Capacitors (MLCC) have a major role in modern electronic devices due to their small price and size, large range of capacitance, small ESL and ESR, and good frequency response. Unfortunately, the main dielectric material used for MLCCs, Barium Titanate, makes the capacitors vibrate due to the piezoelectric and electrostrictive effects. This vibration is transferred to the PCB, making it resonate in the audible range of 20 Hz–20 kHz, and in this way the singing capacitors phenomenon occurs. This phenomenon is usually measured with a microphone, to measure the sound pressure level, or with a Laser Doppler Vibrometer (LDV), to measure the vibration. Besides this, other methods are mentioned in the literature, for example, the optical fiber and the active excitation method. There are several solutions to attenuate or even eliminate the acoustic noise caused by MLCC. Specially designed capacitors for low acoustic levels and different layout geometries are only two options found in the literature. To prevent the singing capacitor phenomenon, different simulations can be performed, the harmonic analysis being the most popular technique. This paper is an up-to-date review of the acoustic noise caused by MLCCs in electronic devices, containing measurements methodologies, solutions, and simulation methods. MDPI 2022-05-19 /pmc/articles/PMC9147252/ /pubmed/35632278 http://dx.doi.org/10.3390/s22103869 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Review
Covaci, Corina
Gontean, Aurel
“Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review
title “Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review
title_full “Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review
title_fullStr “Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review
title_full_unstemmed “Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review
title_short “Singing” Multilayer Ceramic Capacitors and Mitigation Methods—A Review
title_sort “singing” multilayer ceramic capacitors and mitigation methods—a review
topic Review
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9147252/
https://www.ncbi.nlm.nih.gov/pubmed/35632278
http://dx.doi.org/10.3390/s22103869
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