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Sensors 2019, 19(2), 287; https://doi.org/10.3390/s19020287

Prelinearized Class-B Power Amplifier for Piezoelectric Transducers and Portable Ultrasound Systems

Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, 350-27 Gumi-daero, Gumi 39253, Korea
Received: 19 December 2018 / Revised: 7 January 2019 / Accepted: 10 January 2019 / Published: 12 January 2019
(This article belongs to the Special Issue Smart Sensors and Smart Structures)
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Abstract

Portable ultrasound systems typically suffer from unwanted heat and limited battery life, resulting in reduced system performance or the applicable number of piezoelectric transducer elements. This can be a bottleneck in widely used portable ultrasound systems. Class-A power amplifiers are typically used in portable ultrasound systems. However, unwanted heat dissipation needs to be reduced by using large cooling fans and heat pipe structures. To reduce unwanted heat, class-B power amplifiers may be a possible solution. However, the non-linearity of class-B power amplifiers could limit their integration with piezoelectric transducers because non-linearity in the high-voltage output of the power amplifiers deteriorates the sensitivity of portable ultrasound systems. To improve the linearity of the power amplifier, we developed prelinearized class-B power amplifiers for piezoelectric transducers and portable ultrasound systems. To verify our proposed method, we compared the performances of class-B and prelinearized class-B power amplifiers in their pulse-echo responses. Therefore, prelinearized class-B power amplifiers are a possible solution to produce better echo signal performance in piezoelectric transducers and portable ultrasound systems. View Full-Text
Keywords: class-B power amplifier; prelinearizer; portable ultrasound systems class-B power amplifier; prelinearizer; portable ultrasound systems
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Choi, H. Prelinearized Class-B Power Amplifier for Piezoelectric Transducers and Portable Ultrasound Systems. Sensors 2019, 19, 287.

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