Whitepaper

Specifying RF/Microwave Power Amplifiers for EMC Testing

Published by Amplifier Research

This application note from AR RF/Microwave Instrumentation guides EMC test engineers through the process of selecting the right power amplifier for electromagnetic compatibility testing. It begins by surveying common EMC test standards across military, aviation, automotive, and commercial sectors, then defines key amplifier specifications such as frequency response, rated output power, P1dB compression, harmonic distortion, gain, flatness, efficiency, mismatch tolerance, and pulse capabilities. The document compares Class A and Class AB solid-state amplifiers, noting that Class A designs offer superior linearity, ruggedness, and mismatch tolerance while Class AB units are more compact and cost-effective. Traveling Wave Tube Amplifiers (TWTAs) are discussed as a legacy high-power option with drawbacks including high harmonics, lower reliability, and longer lead times, while solid-state pulse amplifiers are presented as a modern alternative. Dual-band amplifiers, complete test systems, multi-tone testing efficiency, GaN transistor technology, and regulatory compliance considerations round out the guide.