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Low Cost 1000 Watt 300 Volt RF Power Amplifier for 27.12 MHz

Low Cost 1000 Watt 300 Volt RF Power Amplifier for 27.12 MHz

This paper describes the design, development, and performance of a low cost, high-efficiency, 1000 Watt RF power amplifier (PA) for 27.12 MHz, operated from a 300VDC supply. The PA is built around a “symmetric Pair” of low cost RF power MOSFETs from Advanced Power Technology (APT). These transistors are from a new generation of high quality, commercial, HF/VHF high voltage silicon devices, in TO-247 packages. The paper addresses both the theoretical design and physical construction of the amplifier, along with a technical description of the RF power transistors themselves.

Transistorized RF Power Amplifiers operate from a low voltage DC source, usually about 50V or less. It is common to use a DC to DC converter rather than a linear regular to increase the system efficiency. This supply requires a down regulator when operated from AC mains and it is a significant portion of the overall cost of the RF amplifier system.

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