| Title |
New High-efficiency Power Amplifier System for High-directional Piezoelectric Transducer |
| Authors |
김진영(Jin-Young Kim) ; 김인동(In-Dong Kim) ; 문원규(Wonkyu Moon) |
| DOI |
http://doi.org/10.5370/KIEE.2018.67.3.383 |
| Keywords |
Matching circuit ; pMUT ; Power amplifier ; Private audio communication system |
| Abstract |
Piezoelectric micro-machined ultrasonic transducers for highly directional speaker need DC bias voltage. Most existing power amplifiers are not suitable for use in highly directional transducers because they are based on AC. In addition, since the piezoelectric micro-machined ultrasonic transducer has a large capacitive reactance, the power efficiency of the power amplifier is very low. Thus this paper proposes a new high efficiency power amplifier with DC bias voltage. In addition, by designing a matching circuit to compensate the capacitive reactance of the micro-machined ultrasonic transducer, the power efficiency of the power amplifier increases. The operating characteristics of the proposed power amplifier was verified by an experimental prototype. The proposed power amplifier is expected to be widely used in designing and implementing other related power amplifiers. |