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Class-C Linearized Amplifier for Portable Ultrasound Instruments
Transistor linearizer networks are proposed to increase the transmitted output voltage amplitudes of class-C amplifiers, thus, increasing the sensitivity of the echo signals of piezoelectric transducers, which are the main components in portable ultrasound instruments. For such instruments, class-C...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6412745/ https://www.ncbi.nlm.nih.gov/pubmed/30795525 http://dx.doi.org/10.3390/s19040898 |
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author | Choi, Hojong |
author_facet | Choi, Hojong |
author_sort | Choi, Hojong |
collection | PubMed |
description | Transistor linearizer networks are proposed to increase the transmitted output voltage amplitudes of class-C amplifiers, thus, increasing the sensitivity of the echo signals of piezoelectric transducers, which are the main components in portable ultrasound instruments. For such instruments, class-C amplifiers could be among the most efficient amplifier schemes because, compared with a linear amplifier such as a class-A amplifier, they could critically reduce direct current (DC) power consumption, thus, increasing the battery life of the instruments. However, the reduced output voltage amplitudes of class-C amplifiers could deteriorate the sensitivity of the echo signals, thereby affecting the instrument performance. Therefore, a class-C linearized amplifier was developed. To verify the capability of the class-C linearized amplifier, typical pulse-echo responses using the focused piezoelectric transducers were tested. The echo signal amplitude generated by the piezoelectric transducers when using the class-C linearized amplifier was improved (1.29 V(p-p)) compared with that when using the class-C amplifier alone (0.56 V(p-p)). Therefore, the class-C linearized amplifier could be a potential candidate to increase the sensitivity of echo signals while reducing the DC power consumption for portable ultrasound instruments. |
format | Online Article Text |
id | pubmed-6412745 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-64127452019-04-03 Class-C Linearized Amplifier for Portable Ultrasound Instruments Choi, Hojong Sensors (Basel) Article Transistor linearizer networks are proposed to increase the transmitted output voltage amplitudes of class-C amplifiers, thus, increasing the sensitivity of the echo signals of piezoelectric transducers, which are the main components in portable ultrasound instruments. For such instruments, class-C amplifiers could be among the most efficient amplifier schemes because, compared with a linear amplifier such as a class-A amplifier, they could critically reduce direct current (DC) power consumption, thus, increasing the battery life of the instruments. However, the reduced output voltage amplitudes of class-C amplifiers could deteriorate the sensitivity of the echo signals, thereby affecting the instrument performance. Therefore, a class-C linearized amplifier was developed. To verify the capability of the class-C linearized amplifier, typical pulse-echo responses using the focused piezoelectric transducers were tested. The echo signal amplitude generated by the piezoelectric transducers when using the class-C linearized amplifier was improved (1.29 V(p-p)) compared with that when using the class-C amplifier alone (0.56 V(p-p)). Therefore, the class-C linearized amplifier could be a potential candidate to increase the sensitivity of echo signals while reducing the DC power consumption for portable ultrasound instruments. MDPI 2019-02-21 /pmc/articles/PMC6412745/ /pubmed/30795525 http://dx.doi.org/10.3390/s19040898 Text en © 2019 by the author. 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 (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Choi, Hojong Class-C Linearized Amplifier for Portable Ultrasound Instruments |
title | Class-C Linearized Amplifier for Portable Ultrasound Instruments |
title_full | Class-C Linearized Amplifier for Portable Ultrasound Instruments |
title_fullStr | Class-C Linearized Amplifier for Portable Ultrasound Instruments |
title_full_unstemmed | Class-C Linearized Amplifier for Portable Ultrasound Instruments |
title_short | Class-C Linearized Amplifier for Portable Ultrasound Instruments |
title_sort | class-c linearized amplifier for portable ultrasound instruments |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6412745/ https://www.ncbi.nlm.nih.gov/pubmed/30795525 http://dx.doi.org/10.3390/s19040898 |
work_keys_str_mv | AT choihojong classclinearizedamplifierforportableultrasoundinstruments |