A 128 MHz Pulse Amplifier Using the ARF475FL RF MOSFET

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  • Author: Richard Frey
The ARF475FL contains a push-pull pair of high voltage RF MOSFETs. It is designed to provide a performance and cost competitive alternative to high power RF parts packaged in the “Gemini” ceramic-metal package. The design presented in this application note uses the ARF475FL in a Class AB linear pulse amplifier, as might be used in a 3T MRI application. The gain and peak power performance are superior to alternative designs using 50 volt parts. The circuit is simple, has good reproducibility and is relatively low cost.