고지향성 스피커를 위한 새로운 전력 증폭기 설계
SCOPUS
KCI
- Title
- 고지향성 스피커를 위한 새로운 전력 증폭기 설계
- Authors
- 김진영; 김인동; Moon, Won-Kyu
- Date Issued
- 2017-12
- Publisher
- 대한전기학회
- Abstract
- Parametric array transducers are used for highly directional speaker in an air environments. Piezoelectric micromachined ultrasonic transducers for parametric array transducers need DC-biased voltage driving signals in order to get high-directional quality-sound features. The existing power amplifier such as class A amplifiers has low efficiency and require large volume heatsinks. To overcome the above-mentioned disadvantages of the conventional amplifier, this paper proposes a new power amplifier system. The proposed power amplifier system ensures high linearity of output characteristic by utilizing the push-pull class B type amplifier. Furthermore, the proposed power amplifier system gets high efficiency because it contains the DC-DC converter-type power supply which can perform energy recovery and envelope tracking function. Also the paper suggests the detailed circuit topology. Its characteristics are verified by the detailed experimental results.
- Keywords
- pMUT; Power amplifier; Private audio communication system; Quasi envelope tracking
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50555
- DOI
- 10.5370/KIEE.2017.66.8.1215
- ISSN
- 1975-8359
- Article Type
- Article
- Citation
- 전기학회논문지, vol. 66, no. 8, page. 1215 - 1221, 2017-12
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