This is a 2W RF amplifier circuit build with single power MOSFET LF2810A.
Figure A is the schematic of the microstrip single stage RF amplifier. The amplifier is based on the M/A-Com LF2810A MOSFET. The transistor is actually a 10 watt, 28 volt part, but provides adequate gain for this application at 12 VDC. The amplifier provides greater than 40% efficiency at the desired output power. Trimmer capacitors are used for input and output matching. Output power is adjusted by a trimpot which sets the gate bias voltage.
Figure B is the layout for the microstrip circuit board. The board material is 0.030 inch Duroid. The circuit board is compression soldered onto a similarly sized copper heat spreader. The board and spreader are milled and drilled to accept the flange-mount transistor.
About LF2810A:
LF2810A is a RF Power MOSFET Transistor 10W, 500-1000MHz, 28V.
LF2810A Features:
Download LF2810A RF Power MOSFET Datasheet:
source: http://www.ham-radio.com/wb6zsu/components/exciter/exciter_mods.html
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