| Title |
Design of High-efficiency Power Amplifier System for High-directional Speaker |
| Authors |
김진영(Kim, Jin-Young) ; 김인동(Kim, In-Dong) ; 문원규(Moon, Wonkyu) |
| DOI |
https://doi.org/10.5370/KIEE.2017.66.8.1215 |
| Keywords |
pMUT ; Power amplifier ; Private audio communication system ; Quasi envelope tracking |
| 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. |