2W RF Amplifier with MOSFET LF2810A circuit diagram

  
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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 i
 2W RF Amplifier with MOSFET LF2810A circuit diagram - schematic

nput 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.



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