Harris Corporation

Dmitriy Borodulin

George Cabrera

Timothy Wilfred Dittmer

Zhiqun Hu

Gavin Martin Monson

Paul Thomas Moore

Peter John Poggi

Bryce A Robertson

A multiple mode RF power amplifier system is presented having N different power control modes for controlling the level of the output RF power relative to applied input power. The system includes a mode controller that receives one of N different mode select commands and in response thereto selects one of N different control modes to be operational. A gain controller controls the gain of the power amplifier system so as to control the level of the output RF power as a function of a control signal applied thereto. The control signal is applied to the gain controller wherein the control signal has a value dependent upon which of the N modes has been selected.

RF power amplifier system having a plurality of different power control modes

An RF wideband amplifier system is provided that includes an M way splitter for receiving an RF input signal and splitting same into M RF signals for respective application to M power amplifier modules PAM- to PAM-M that amplify the M signals and apply the amplified M signals to an M way combiner that applies an amplified RF signal to a load. A main controller provides an automatic level control reference signal, representative of the desired output power level of each of the power amplifier modules. Each power amplifier module includes an 2*N way balanced splitter that receives one of the M RF signals and splits the signal into 2*N signal portions; 2*N RF amplifiers that respectively receive the 2*N signal portions and amplify same and provide therefrom 2*N amplified signal portions; an 2*N way RF combiner that receives and combines the amplified RF signal portions and provides therefrom a combined amplified output RF signal; a power detector that provides a power signal representative of the level of the output power of the power amplifier module; a difference circuit that provides an attenuation control signal having a value in accordance with the difference in values of the power signal and the reference signal; and, a variable adjuster that adjusts the magnitude of the one of the M RF signals in accordance with the difference.

Broadband amplifier system having improved linearity and minimum loss

A directional coupler comprises a coupler circuit board which is mounted substantially perpendicular to the surface of a parent circuit board. First and second upper traces are disposed on the opposing surfaces of the coupler circuit board. The coupling between the upper electrically conductive traces determines the odd mode impedance of the coupler. First and second lower traces are also disposed on opposing surfaces and connected to ground. The upper and lower traces are arranged such that the even mode of the impedance is determined by the coupling between the first upper trace and the second lower trace and the coupling between the second upper trace and the first lower trace.

Surface mounted broadside directional coupler

A power amplifier system is presented for use in amplifying an RF input signal comprising N sub-power amplifiers are connected together in parallel with each receiving and amplifying a portion of the RF input signal. A combiner combines the amplified portions of the RF input signal to provide a combined output signal. Each sub-amplifier includes at least one transistor having an input port that receives a DC bias voltage and an output port, such that when the RF input signal is not present a quiescent current flows through the output port. A controller is operative when the RF signal is not present to check and adjust the magnitude of the quiescent current flowing in each of the sub-amplifier output ports in the sequence of 1 . . . N.

RF power amplifier transistor quiescent current checking and adjusting

A power amplifier system is presented for amplifying an RF input signal. The system includes a vector modulator for receiving and modifying an input signal and providing therefrom a modified signal. The system also includes at least one power amplifier the operation of which is monitored and the vector modulator is controlled in accordance with the monitoring.

Power amplifier having monitoring and circuit protection

A combiner/divider is provided which includes a common output/input port and a plurality of N input/output ports and a plurality of N isolation ports. A 90.degree. phase shifter interconnects each of the N input/output ports with the common port. N transmission line balun transformers are provided with each interconnecting an input/output port with one of the N isolation ports. Each balun transformer serves as a two-way power splitter.

Growing community of inventors

Mason, OH, United States of America

Dmitriy Borodulin