Patent ID: 7940120

Claim:
A power amplifier having an input connected to a main port of a quadrature hybrid splitter, said quadrature hybrid splitter having an in-phase port coupled to an output of said power amplifier through a main amplifier and another quadrature hybrid, said quadrature hybrid splitter further having a 90° phase shift port also coupled of said other quadrature hybrid, wherein said power amplifier further comprises a quadrature hybrid combiner having a main port connected to the in-phase port of said quadrature hybrid splitter and a 90° phase shift port connected to an input of said main amplifier, an output of said main amplifier being connected to an in-phase port of said other quadrature hybrid, wherein the 90° phase shift port of said quadrature hybrid splitter is connected to a first input of a subtracter of which an output is coupled to an isolated port of said quadrature hybrid combiner via a first phase shifter, wherein said other quadrature hybrid further has a 90° phase shift port coupled to a second input of said subtracter via a second phase shifter, wherein said other quadrature hybrid further has a main port connected to the output of said power amplifier.