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High-efficiency high-voltage class F amplifier for high-frequency wireless ultrasound systems
This paper presents a novel amplifier that satisfies both low distortion and high efficiency for high-frequency wireless ultrasound systems with limited battery life and size. While increasing the amplifier efficiency helps to address the problems for wireless ultrasound systems, it can cause signal...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8006987/ https://www.ncbi.nlm.nih.gov/pubmed/33780492 http://dx.doi.org/10.1371/journal.pone.0249034 |
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author | Kim, Kyeongjin Choi, Hojong |
author_facet | Kim, Kyeongjin Choi, Hojong |
author_sort | Kim, Kyeongjin |
collection | PubMed |
description | This paper presents a novel amplifier that satisfies both low distortion and high efficiency for high-frequency wireless ultrasound systems with limited battery life and size. While increasing the amplifier efficiency helps to address the problems for wireless ultrasound systems, it can cause signal distortion owing to harmonic components. Therefore, a new type of class F amplifier is designed to achieve high efficiency and low distortion. In the amplifier, the resonant circuit at each stage controls the harmonic components to reduce distortion and improve efficiency. Transformers with a large shunt resistor are also helpful to reduce the remaining noise in the input signal. The proposed class F amplifier is tested using simulations, and the voltage and current waveforms are analyzed to achieve correct operation with adequate efficiency and distortion. The measured performance of the class F amplifier has a gain of 23.2 dB and a power added efficiency (PAE) of 88.9% at 25 MHz. The measured DC current is 121 mA with a variance of less than 1% when the PA is operating. We measured the received echo signal through the pulse-echo response using a 25-MHz transducer owing to the compatibility of the designed class F amplifier with high- frequency transducers. The measured total harmonic distortion (THD) of the echo signal was obtained as 4.5% with a slightly low ring-down. The results show that the low THD and high PAE of the new high-efficiency and high-voltage amplifier may increase battery life and reduce the cooling fan size, thus providing a suitable environment for high-frequency wireless ultrasound systems. |
format | Online Article Text |
id | pubmed-8006987 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-80069872021-04-07 High-efficiency high-voltage class F amplifier for high-frequency wireless ultrasound systems Kim, Kyeongjin Choi, Hojong PLoS One Research Article This paper presents a novel amplifier that satisfies both low distortion and high efficiency for high-frequency wireless ultrasound systems with limited battery life and size. While increasing the amplifier efficiency helps to address the problems for wireless ultrasound systems, it can cause signal distortion owing to harmonic components. Therefore, a new type of class F amplifier is designed to achieve high efficiency and low distortion. In the amplifier, the resonant circuit at each stage controls the harmonic components to reduce distortion and improve efficiency. Transformers with a large shunt resistor are also helpful to reduce the remaining noise in the input signal. The proposed class F amplifier is tested using simulations, and the voltage and current waveforms are analyzed to achieve correct operation with adequate efficiency and distortion. The measured performance of the class F amplifier has a gain of 23.2 dB and a power added efficiency (PAE) of 88.9% at 25 MHz. The measured DC current is 121 mA with a variance of less than 1% when the PA is operating. We measured the received echo signal through the pulse-echo response using a 25-MHz transducer owing to the compatibility of the designed class F amplifier with high- frequency transducers. The measured total harmonic distortion (THD) of the echo signal was obtained as 4.5% with a slightly low ring-down. The results show that the low THD and high PAE of the new high-efficiency and high-voltage amplifier may increase battery life and reduce the cooling fan size, thus providing a suitable environment for high-frequency wireless ultrasound systems. Public Library of Science 2021-03-29 /pmc/articles/PMC8006987/ /pubmed/33780492 http://dx.doi.org/10.1371/journal.pone.0249034 Text en © 2021 Kim, Choi http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Kim, Kyeongjin Choi, Hojong High-efficiency high-voltage class F amplifier for high-frequency wireless ultrasound systems |
title | High-efficiency high-voltage class F amplifier for high-frequency wireless ultrasound systems |
title_full | High-efficiency high-voltage class F amplifier for high-frequency wireless ultrasound systems |
title_fullStr | High-efficiency high-voltage class F amplifier for high-frequency wireless ultrasound systems |
title_full_unstemmed | High-efficiency high-voltage class F amplifier for high-frequency wireless ultrasound systems |
title_short | High-efficiency high-voltage class F amplifier for high-frequency wireless ultrasound systems |
title_sort | high-efficiency high-voltage class f amplifier for high-frequency wireless ultrasound systems |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8006987/ https://www.ncbi.nlm.nih.gov/pubmed/33780492 http://dx.doi.org/10.1371/journal.pone.0249034 |
work_keys_str_mv | AT kimkyeongjin highefficiencyhighvoltageclassfamplifierforhighfrequencywirelessultrasoundsystems AT choihojong highefficiencyhighvoltageclassfamplifierforhighfrequencywirelessultrasoundsystems |