Raytheon Company

Thomas L Middlebrook

David D Heston

John G Heston

Jon Mooney

Bryan G Fast

A circuit for amplifying a source signal generated by a signal source having a first impedance includes a transmission line transformer (TLT) having a first, a second, a third, and a fourth port wherein the TLT is coupled to receive the source signal at the first port and configured to output a corresponding impedance matched signal at the second port, the second port is coupled to the third port of the TLT, the circuit also including a TLT load having a first terminal coupled to the fourth port of the TLT and a second terminal coupled to a reference potential. The circuit additionally includes an amplifier device responsive to the impedance matched signal to generate an amplified signal.

Systems for amplifying a signal using a transformer matched transistor

According to one embodiment of the invention, a power absorber for receiving a signal having a fundamental frequency includes an input node for receiving the signal and a first PIN diode circuit having a first end electrically connected at the input node and a second end. The first PIN diode circuit includes at least one PIN diode. The absorber also includes a load resistance having a first end electrically connected to the second end of the PIN diode circuit and a second end electrically connected to a reference voltage. The absorber also includes a quarter wave transmission line having a first end electrically connected to the input node at a second end. The quarter wave transmission line has an electrical link that is one quarter of the wavelength of the fundamental frequency. The power absorber also includes a second PIN diode circuit having an input electrically connected to the second end of the quarter wave transmission line and an output electrically connected to the reference voltage. The first choke is provided in parallel with the load resistor.

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Rowlett, TX, United States of America

Thomas L Middlebrook