A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique
Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, 350-27 Gumi-Daero, Gumi 39253, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Jangmyung Lee
Sensors 2021, 21(8), 2795; https://doi.org/10.3390/s21082795
Received: 12 March 2021
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Revised: 7 April 2021
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Accepted: 12 April 2021
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Published: 15 April 2021
(This article belongs to the Special Issue Applications of Ultrasonic Sensors)
To obtain a high-quality signal from an ultrasound system through the transmitter, it is necessary to achieve an appropriate operating point of the power amplifier in the ultrasonic transmitter by applying high static bias voltage. However, the power amplifier needs to be operated at low bias voltage, because a power amplifier operating at high bias voltage may consume a large amount of power and increase the temperature of the active devices, worsening the signal characteristics of the ultrasound systems. Therefore, we propose a new method of increasing the bias voltage for a specific period to solve this problem by reducing the output signal distortion of the power amplifier and decreasing the load on the active device. To compare the performance of the proposed method, we measured and compared the signals of the amplifier with the proposed technique and the amplifier only. Notably, improvement was achieved with 11.1% of the power added efficiency and 3.23% of the total harmonic distortion (THD). Additionally, the echo signal generated by the ultrasonic transducer was improved by 2.73 dB of amplitude and 0.028% of THD under the conditions of an input signal of 10 mW. Therefore, the proposed method could be useful for improving ultrasonic transmitter performance using the developed technique.
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MDPI and ACS Style
Kim, K.; Choi, H. A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique. Sensors 2021, 21, 2795. https://doi.org/10.3390/s21082795
AMA Style
Kim K, Choi H. A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique. Sensors. 2021; 21(8):2795. https://doi.org/10.3390/s21082795
Chicago/Turabian StyleKim, Kyeongjin, and Hojong Choi. 2021. "A New Approach to Power Efficiency Improvement of Ultrasonic Transmitters via a Dynamic Bias Technique" Sensors 21, no. 8: 2795. https://doi.org/10.3390/s21082795
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