Patent 7944305 was granted and assigned to Coherent (operating system) on May, 2011 by the United States Patent and Trademark Office.
An RF amplifier circuit includes a MOSFET connected to an RF output of the circuit via an impedance matching network including an inductor and a tuning capacitor connected in parallel with the inductor and the MOSFET. DC voltage is applied to the MOSFET via a series path through a radio frequency choke and the inductor of the impedance matching network.