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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| Format: | Article |
| Language: | English |
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MDPI AG
2019-02-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/19/4/898 |
| _version_ | 1798000030589648896 |
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| author | Hojong Choi |
| author_facet | Hojong Choi |
| author_sort | Hojong Choi |
| collection | DOAJ |
| 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<sub>p-p</sub>) compared with that when using the class-C amplifier alone (0.56 V<sub>p-p</sub>). 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. |
| first_indexed | 2024-04-11T11:13:46Z |
| format | Article |
| id | doaj.art-274dcb57312c46a39926250965e76907 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T11:13:46Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-274dcb57312c46a39926250965e769072022-12-22T04:27:19ZengMDPI AGSensors1424-82202019-02-0119489810.3390/s19040898s19040898Class-C Linearized Amplifier for Portable Ultrasound InstrumentsHojong Choi0Department of Medical IT Convergence Engineering and Kumoh National Institute of Technology, Gumi 39253, KoreaTransistor 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<sub>p-p</sub>) compared with that when using the class-C amplifier alone (0.56 V<sub>p-p</sub>). 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.https://www.mdpi.com/1424-8220/19/4/898class-C amplifiertransistor linearizerportable ultrasound instruments |
| spellingShingle | Hojong Choi Class-C Linearized Amplifier for Portable Ultrasound Instruments Sensors class-C amplifier transistor linearizer 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 | class-C amplifier transistor linearizer portable ultrasound instruments |
| url | https://www.mdpi.com/1424-8220/19/4/898 |
| work_keys_str_mv | AT hojongchoi classclinearizedamplifierforportableultrasoundinstruments |