Class-C Linearized Amplifier for Portable Ultrasound Instruments
- Authors
- Choi, Hojong
- Issue Date
- 2-Feb-2019
- Publisher
- MDPI
- Keywords
- class-C amplifier; transistor linearizer; portable ultrasound instruments
- Citation
- SENSORS, v.19, no.4
- Journal Title
- SENSORS
- Volume
- 19
- Number
- 4
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/25559
- DOI
- 10.3390/s19040898
- ISSN
- 1424-8220
1424-3210
- Abstract
- 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 Vp-p) compared with that when using the class-C amplifier alone (0.56 Vp-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.
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Collections - Department of Medical IT Convergence Engineering > 1. Journal Articles
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