USA as Represented by Secretary of the Navy

US Government as Represented by the Secretary of the Army

Joe Qiu

Ali Mohamed Darwish

Hingloi Alfred Hung

David K Abe

A radio transmitter having a RF signal source. A splitter receives an input signal from the signal source and divides that input signal into two output signals. These output signals are fed into two phase shifters. A phase control signal is applied to each phase shifter so that the vector sum of the output signals represents the desired amplitude and phase of the desired transmitted signal. The outputs of both phase shifters are both frequency multiplied and amplified before recombining to form the transmitter output signal.

High frequency transmitter

A predistortion linearizer for predistorting a radiofrequency (RF) signal includes a first third-order predistortion linearizer having an input for receiving the RF signal, and a second third-order predistortion linearizer connected in cascade with the first linearizer, whereby fifth order nonlinearities are introduced into a cascaded, predistorted RF output signal. Cascading additional third-order linearizers similarly provides higher-order linearizers.

Growing community of inventors

Silver Spring, MD, United States of America

Joe Qiu