Broadband Linear High-Power Amplifier Based on the Parallel Amplification Architecture for Electromagnetic Ultrasonic...

Area of Science:

• Electrical Engineering
• Materials Science
• Acoustics

Background:

• High-output power linear amplifiers are crucial for generating ultrasonic guided waves (UGWs) using electromagnetic acoustic transducers (EMATs).
• Existing methods for achieving broadband, high-power amplification for EMATs are limited.

Purpose of the Study:

• To develop a linear power amplifier capable of high-output power and broadband frequency operation for EMAT applications.
• To address the limitations in generating high-power, linear signals for UGW generation.

Main Methods:

• A differential power amplifier architecture was designed using parallel amplification modules.
• Broadband feedback circuits and negative voltage feedback were incorporated to enhance performance.
• The differential structure was employed to suppress harmonic distortions and improve signal integrity.

Main Results:

• The developed power amplifier achieved a -3 dB bandwidth from 40 kHz to 2.5 MHz.
• Transient output power exceeded 1 kW.
• The amplifier successfully drove EMATs to generate UGWs.

Conclusions:

• The proposed power amplifier offers high-output power and good linearity, making it suitable for EMAT UGW applications.
• The novel design overcomes limitations in current amplification techniques for UGW generation.