Abstract: A distortion correction circuit having a mechanism for intercepting a distorted output signal from a receiver and for generating an Nth order signal. A circuit is provided to subtract the Nth order signal from the distorted output signal for providing a circuit output signal. Finally, a feedback loop is provided to feed back the circuit output signal for controlling the Nth order signal and for providing a distortion corrected circuit output signal. In a preferred embodiment, the distortion correction circuit includes a calibration circuit which provides a calibration signal employed to linearize a receiver channel. The receiver channel includes a plurality of receiver stages which receive the calibration signal and provide the distorted output signal which is intercepted and directed to a cubing circuit. The cubing circuit generates an error correction signal controlled by the feedback loop to cancel the distortion component of the distorted output signal.

Abstract: A Monolithic Microwave Integrated Circuit (MMIC) amplifier with extended dynamic range includes a base circuit for receiving both a first input signal, which is the signal to be amplified, and an amplifier generated second input signal. A power amplifier in the base circuit directly receives and amplifies the first input signal, with some unavoidable distortion to the first input signal. A first directional coupler is connected with the base circuit to couple the output of the power amplifier with the first input signal to cancel the first input signal component from the output of the power amplifier and generate the second input signal which is only distortion. This distortion is then amplified by an error amplifier in the base circuit, and the output of the error amplifier is coupled with the output of the power amplifier through a second directional coupler. This coupling at the second directional coupler cancels the distortion from the output of the power amplifier to provide the desired amplified signal.