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A Class-J Power Amplifier Implementation for Ultrasound Device Applications.

Kiheum You1, Seung-Hwan Kim2, Hojong Choi1

  • 1Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, 350-27 Gumi-daero, Gumi 39253, Korea.

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A class-J power amplifier offers high efficiency and output power for ultrasonic systems. This amplifier effectively boosts echo signals, overcoming limitations in sensitive ultrasonic devices for improved detection.

Keywords:
class-J power amplifierhigh efficiencyhigh output powerultrasonic device

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Area of Science:

  • Electrical Engineering
  • Acoustics
  • Electronics

Background:

  • Power amplifiers are crucial for supplying output voltages in ultrasonic systems.
  • Low sensitivity and voltage limits in ultrasonic devices hinder echo signal detection.
  • Existing systems face challenges in achieving adequate echo signal amplitude.

Purpose of the Study:

  • To propose and evaluate a class-J power amplifier for ultrasonic device applications.
  • To address the limitations of low sensitivity and maximum allowable voltages in ultrasonic devices.
  • To enhance the detection of echo signals in ultrasonic systems.

Main Methods:

  • Development of a class-J power amplifier.
  • Characterization of the amplifier's power efficiency and gain at 25 MHz.
  • Utilizing the pulse-echo measurement method to verify performance and measure echo signals.

Main Results:

  • The class-J power amplifier achieved 63.91% power efficiency and 28.16 dB gain.
  • Measured echo signals showed amplitudes of 4.4 V (first echo) and 1.08 V (second echo).
  • Total harmonic distortion (THD) was 22.35% for the first echo and 12.45% for the second echo.

Conclusions:

  • The class-J power amplifier effectively generates high output power and efficiency.
  • It successfully supplies high-amplitude echo signals to ultrasonic devices.
  • This amplifier technology can overcome challenges in ultrasonic systems with sensitive devices.