Powerwave Technologies, Inc.

Jianqing He

Mark Gurvich

Alex Rabinovich

Nikolai Maslennikov

A dual loop feedforward power amplifier. A dual loop feedforward power amplifier, comprising an input that provides a multicarrier signal; a first feedforward power amplifier; and a second feedforward power amplifier, wherein the first feedforward power amplifier serves as a main amplifier gain block in the second feedforward power amplifier, wherein the first feedforward power amplifier comprises a carrier cancellation loop and a first error amplifier loop, and wherein the second feedforward power amplifier comprises a third loop and a fourth loop that cancel small signal distortions that are not reduced by the first feedforward amplifier.

System and method of carrier reinjection in a feedforward amplifier

A group delay adjusting circuit. The group delay adjusting circuit comprises an electronically adjustable variable capacitance, and an electronically variable virtual inductor coupled in parallel to the electronically variable capacitance at a node.

System and method for adjusting group delay

A microstrip coupler is provided which includes an controlled capacitance bridge for improved directivity as compared to prior art controlled capacitance bridges. The novel controlled capacitance bridge provides the functionality of prior art wire or ribbon controlled capacitance bridges and also provides the necessary capacitance to compensate for the different phase velocities of odd and even modes in the transmission lines. Both the dimensions of the controlled capacitance bridge and the dimensions of an input microstrip conductor may be adjusted to provide the appropriate level of capacitance. In some embodiments, the controlled capacitance bridge connects segments of an input microstrip conductor. In other embodiments, the controlled capacitance bridge connects microstrip conductors which are configured to couple an input signal from an input microstrip conductor.

Microstrip coupler

A system and method of pilot tone reuse. The present invention therefore provides a feedforward amplifier, comprising: an input that accepts a radio frequency signal having multiple carriers; a first control loop including a main amplifier block and a detector, wherein the first control loop generates a first carrier cancelled signal; a second control loop including a pilot generator, I/Q demodulator, vector modulator and first error amplifier block, wherein the pilot generator, I/Q demodulator and first error amplifier block amplify the first carrier cancelled signal and generates a pilot signal; a third control loop comprising a vector modulator and a second carrier cancellation detector; and a fourth control loop comprising of vector modulator, a second error amplifier block, and a pilot signal receiver for receiving the pilot signal generated by the pilot generator in the second error amplifier block such that the pilot signal is reused by the fourth control loop to thereby further cancel intermodulation distortion in the output of the main amplifier block.

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Cerritos, CA, United States of America

Jianqing He