Application Note

Application Note: A 300W MOSFET Linear Amplifier for 50 MHz

Source: Microsemi Power Products Group, Formerly Advanced Power Technology RF

By Richard Frey, P.E.

In an earlier article, the author described a 50 MHz 125V 250W class C amplifier using the ARF448A/B high voltage MOSFET devices. This paper now describes an improved version of that amplifier which is capable of class AB linear operation. The design changes required and the procedures involved are explained and demonstrated. A complete description of the amplifier and its construction are presented as well as the measured performance.

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