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Bias-Voltage Stabilizer for HVHF Amplifiers in VHF Pulse-Echo Measurement Systems
The impact of high-voltage–high-frequency (HVHF) amplifiers on echo-signal quality is greater with very-high-frequency (VHF, ≥100 MHz) ultrasound transducers than with low-frequency (LF, ≤15 MHz) ultrasound transducers. Hence, the bias voltage of an HVHF amplifier must be stabilized to ensure stable...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5676603/ https://www.ncbi.nlm.nih.gov/pubmed/29065526 http://dx.doi.org/10.3390/s17102425 |
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author | Choi, Hojong Park, Chulwoo Kim, Jungsuk Jung, Hayong |
author_facet | Choi, Hojong Park, Chulwoo Kim, Jungsuk Jung, Hayong |
author_sort | Choi, Hojong |
collection | PubMed |
description | The impact of high-voltage–high-frequency (HVHF) amplifiers on echo-signal quality is greater with very-high-frequency (VHF, ≥100 MHz) ultrasound transducers than with low-frequency (LF, ≤15 MHz) ultrasound transducers. Hence, the bias voltage of an HVHF amplifier must be stabilized to ensure stable echo-signal amplitudes. We propose a bias-voltage stabilizer circuit to maintain stable DC voltages over a wide input range, thus reducing the harmonic-distortion components of the echo signals in VHF pulse-echo measurement systems. To confirm the feasibility of the bias-voltage stabilizer, we measured and compared the deviations in the gain of the HVHF amplifier with and without a bias-voltage stabilizer. Between −13 and 26 dBm, the measured gain deviations of a HVHF amplifier with a bias-voltage stabilizer are less than that of an amplifier without a bias-voltage stabilizer. In order to confirm the feasibility of the bias-voltage stabilizer, we compared the pulse-echo responses of the amplifiers, which are typically used for the evaluation of transducers or electronic components used in pulse-echo measurement systems. From the responses, we observed that the amplitudes of the echo signals of a VHF transducer triggered by the HVHF amplifier with a bias-voltage stabilizer were higher than those of the transducer triggered by the HVHF amplifier alone. The second, third, and fourth harmonic-distortion components of the HVHF amplifier with the bias-voltage stabilizer were also lower than those of the HVHF amplifier alone. Hence, the proposed scheme is a promising method for stabilizing the bias voltage of an HVHF amplifier, and improving the echo-signal quality of VHF transducers. |
format | Online Article Text |
id | pubmed-5676603 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-56766032017-11-17 Bias-Voltage Stabilizer for HVHF Amplifiers in VHF Pulse-Echo Measurement Systems Choi, Hojong Park, Chulwoo Kim, Jungsuk Jung, Hayong Sensors (Basel) Article The impact of high-voltage–high-frequency (HVHF) amplifiers on echo-signal quality is greater with very-high-frequency (VHF, ≥100 MHz) ultrasound transducers than with low-frequency (LF, ≤15 MHz) ultrasound transducers. Hence, the bias voltage of an HVHF amplifier must be stabilized to ensure stable echo-signal amplitudes. We propose a bias-voltage stabilizer circuit to maintain stable DC voltages over a wide input range, thus reducing the harmonic-distortion components of the echo signals in VHF pulse-echo measurement systems. To confirm the feasibility of the bias-voltage stabilizer, we measured and compared the deviations in the gain of the HVHF amplifier with and without a bias-voltage stabilizer. Between −13 and 26 dBm, the measured gain deviations of a HVHF amplifier with a bias-voltage stabilizer are less than that of an amplifier without a bias-voltage stabilizer. In order to confirm the feasibility of the bias-voltage stabilizer, we compared the pulse-echo responses of the amplifiers, which are typically used for the evaluation of transducers or electronic components used in pulse-echo measurement systems. From the responses, we observed that the amplitudes of the echo signals of a VHF transducer triggered by the HVHF amplifier with a bias-voltage stabilizer were higher than those of the transducer triggered by the HVHF amplifier alone. The second, third, and fourth harmonic-distortion components of the HVHF amplifier with the bias-voltage stabilizer were also lower than those of the HVHF amplifier alone. Hence, the proposed scheme is a promising method for stabilizing the bias voltage of an HVHF amplifier, and improving the echo-signal quality of VHF transducers. MDPI 2017-10-23 /pmc/articles/PMC5676603/ /pubmed/29065526 http://dx.doi.org/10.3390/s17102425 Text en © 2017 by the authors. 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 Park, Chulwoo Kim, Jungsuk Jung, Hayong Bias-Voltage Stabilizer for HVHF Amplifiers in VHF Pulse-Echo Measurement Systems |
title | Bias-Voltage Stabilizer for HVHF Amplifiers in VHF Pulse-Echo Measurement Systems |
title_full | Bias-Voltage Stabilizer for HVHF Amplifiers in VHF Pulse-Echo Measurement Systems |
title_fullStr | Bias-Voltage Stabilizer for HVHF Amplifiers in VHF Pulse-Echo Measurement Systems |
title_full_unstemmed | Bias-Voltage Stabilizer for HVHF Amplifiers in VHF Pulse-Echo Measurement Systems |
title_short | Bias-Voltage Stabilizer for HVHF Amplifiers in VHF Pulse-Echo Measurement Systems |
title_sort | bias-voltage stabilizer for hvhf amplifiers in vhf pulse-echo measurement systems |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5676603/ https://www.ncbi.nlm.nih.gov/pubmed/29065526 http://dx.doi.org/10.3390/s17102425 |
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