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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...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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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 |
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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 |
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