US 12,015,380 B2 · Radio frequency power amplifier

Abstract

A balanced amplifier system having input and output quadrature couplers or equivalents thereof and two amplifiers there between. An RF signal is presented to a first input of an input quadrature coupler such that an amplified RF signal is output at a first output of the output quadrature coupler. A RF control signal is presented to a second input of the quadrature coupler such that an amplified control signal is outputted at the other output of the output quadrature coupler. The system is configured to reflect the amplified signal back into the second port of the output quadrature coupler in order to vary an impedance seen by the amplifiers of the balanced amplifier.

Claims18

Dependent claims

A radio frequency power amplifier system for amplifying an RF signal, the system comprising:

a balanced amplifier having an input quadrature coupler, an output quadrature coupler, and two amplifiers there-between;
the output quadrature coupler having a first output at which the amplified RF signal will be output;
means to modify and/or modulate an impedance at outputs of the two amplifiers, said means including:
a radio frequency control signal source connected to the two amplifiers and configured to provide an RF control signal that will be amplified by the two amplifiers such that an amplified RF control signal will be output at a second output of the output quadrature coupler;
and
a signal reflector connected to the second output of the output quadrature coupler and arranged to reflect the amplified RF control signal back to the second output of the output quadrature coupler.

3 more elements

Dependencies are inferred from the claim text.

Radio frequency power amplifier

Life of this patent

Radio frequency power amplifier

Life of this patent

Abstract

Claims18