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Appl. Sci. 2017, 7(4), 354;

A Wideband High-Voltage Power Amplifier Post-Linearizer for Medical Ultrasound Transducers

Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi 39253, Korea
Department of Biomedical Engineering, Inje University, Gimhae 50834, Korea
School of Biomedical Engineering, Korea University, Seoul 02841, Korea
Authors to whom correspondence should be addressed.
Received: 21 January 2017 / Revised: 16 March 2017 / Accepted: 23 March 2017 / Published: 4 April 2017
(This article belongs to the Section Acoustics and Vibrations)
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The medical ultrasound transducer is a principal component in ultrasound systems, as it significantly influences system performance. The high-voltage power amplifier (HVPA) is the key ultrasound transmitter component and interfaces with the medical ultrasound transducer. Therefore, the performance of the HVPA critically affects the echo signal quality of the ultrasound transducer. As they are inherently non-linear devices, harmonic distortion of echo signals generated by the ultrasound transducers would critically deteriorate the echo signal quality in ultrasound systems. The primary aim of this research is to integrate a novel post-linearizer into the HVPA to suppress harmonic distortion in medical ultrasound transducers. Moreover, this study is based on the assumption that linearizing the HVPA could reduce the harmonic distortion components of the echo signals. The developed HVPA with post-linearizer was tested in an ultrasound microscopy system in order to demonstrate the harmonic suppression capability on the echo signal generated by the ultrasound transducer. When 10 MHz, 5-cycle, 26 dBm input power was sent to the HVPA with and without the post-linearizer circuits, the measured second-, third-, fourth- and fifth- harmonic distortions of a 10 MHz transducer with the post-linearizer (−13.11 dB, −10.81 dB, −16.33 dB, and −22.78 dB) were suppressed to a greater degree than those of the same transducer without the post-linearizer (−4.58 dB, −8.87 dB, −10.51 dB, and −15.31 dB).. Therefore, we conclude that the addition of the post-linearizer to the HVPA is a potentially useful electronic technique for improving echo signal quality in medical ultrasound transducers. View Full-Text
Keywords: post-linearizer; medical ultrasound transducer; high-voltage power amplifier post-linearizer; medical ultrasound transducer; high-voltage power amplifier

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Choi, H.; Yoon, C.; Yeom, J.-Y. A Wideband High-Voltage Power Amplifier Post-Linearizer for Medical Ultrasound Transducers. Appl. Sci. 2017, 7, 354.

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