Cargando…

A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique

To obtain a high-quality signal from an ultrasound system through the transmitter, it is necessary to achieve an appropriate operating point of the power amplifier in the ultrasonic transmitter by applying high static bias voltage. However, the power amplifier needs to be operated at low bias voltag...

Descripción completa

Detalles Bibliográficos
Autores principales: Kim, Kyeongjin, Choi, Hojong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8071451/
https://www.ncbi.nlm.nih.gov/pubmed/33921082
http://dx.doi.org/10.3390/s21082795
_version_ 1783683708738338816
author Kim, Kyeongjin
Choi, Hojong
author_facet Kim, Kyeongjin
Choi, Hojong
author_sort Kim, Kyeongjin
collection PubMed
description To obtain a high-quality signal from an ultrasound system through the transmitter, it is necessary to achieve an appropriate operating point of the power amplifier in the ultrasonic transmitter by applying high static bias voltage. However, the power amplifier needs to be operated at low bias voltage, because a power amplifier operating at high bias voltage may consume a large amount of power and increase the temperature of the active devices, worsening the signal characteristics of the ultrasound systems. Therefore, we propose a new method of increasing the bias voltage for a specific period to solve this problem by reducing the output signal distortion of the power amplifier and decreasing the load on the active device. To compare the performance of the proposed method, we measured and compared the signals of the amplifier with the proposed technique and the amplifier only. Notably, improvement was achieved with 11.1% of the power added efficiency and 3.23% of the total harmonic distortion (THD). Additionally, the echo signal generated by the ultrasonic transducer was improved by 2.73 dB of amplitude and 0.028% of THD under the conditions of an input signal of 10 mW. Therefore, the proposed method could be useful for improving ultrasonic transmitter performance using the developed technique.
format Online
Article
Text
id pubmed-8071451
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-80714512021-04-26 A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique Kim, Kyeongjin Choi, Hojong Sensors (Basel) Article To obtain a high-quality signal from an ultrasound system through the transmitter, it is necessary to achieve an appropriate operating point of the power amplifier in the ultrasonic transmitter by applying high static bias voltage. However, the power amplifier needs to be operated at low bias voltage, because a power amplifier operating at high bias voltage may consume a large amount of power and increase the temperature of the active devices, worsening the signal characteristics of the ultrasound systems. Therefore, we propose a new method of increasing the bias voltage for a specific period to solve this problem by reducing the output signal distortion of the power amplifier and decreasing the load on the active device. To compare the performance of the proposed method, we measured and compared the signals of the amplifier with the proposed technique and the amplifier only. Notably, improvement was achieved with 11.1% of the power added efficiency and 3.23% of the total harmonic distortion (THD). Additionally, the echo signal generated by the ultrasonic transducer was improved by 2.73 dB of amplitude and 0.028% of THD under the conditions of an input signal of 10 mW. Therefore, the proposed method could be useful for improving ultrasonic transmitter performance using the developed technique. MDPI 2021-04-15 /pmc/articles/PMC8071451/ /pubmed/33921082 http://dx.doi.org/10.3390/s21082795 Text en © 2021 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 Article
Kim, Kyeongjin
Choi, Hojong
A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique
title A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique
title_full A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique
title_fullStr A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique
title_full_unstemmed A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique
title_short A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique
title_sort new approach to power efficiency improvement of ultrasonic transmitters via a dynamic bias technique
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8071451/
https://www.ncbi.nlm.nih.gov/pubmed/33921082
http://dx.doi.org/10.3390/s21082795
work_keys_str_mv AT kimkyeongjin anewapproachtopowerefficiencyimprovementofultrasonictransmittersviaadynamicbiastechnique
AT choihojong anewapproachtopowerefficiencyimprovementofultrasonictransmittersviaadynamicbiastechnique
AT kimkyeongjin newapproachtopowerefficiencyimprovementofultrasonictransmittersviaadynamicbiastechnique
AT choihojong newapproachtopowerefficiencyimprovementofultrasonictransmittersviaadynamicbiastechnique