Patent ID: 8670730

Claim:
A radio frequency (RF) transmitter for use in an avionics system, comprising: a power amplifier having an input and an output, the power amplifier being configured to deliver at least 15 watts of output power to an antenna port; biasing circuitry operative to bias the power amplifier to operate in its Class AB region; an up-converter having an input and an output configured to provide an RF signal to the power amplifier; an error amplifier having a first input configured to receive an I/Q input signal, a second input, and an output, the output being the difference of the first input and the second input and being operatively coupled to the input of the up-converter; a driver amplifier having an input and an output, the input being operatively coupled to the output of the up-converter, the output being operatively coupled to the input of the power amplifier; a first interstaqe pad operatively coupled between the input of the driver amplifier and the output of the up-converter; a second interstage pad operatively coupled between the output of the driver amplifier and the input of the power amplifier; and a Cartesian feedback loop operatively coupled between the output of the power amplifier and the second input of the error amplifier.