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. In the preferred embodiment, the feedback loop controls the amplitude and phase of the error correction signal while in another illustrative embodiment, only the amplitude of the error correction signal is controlled.Thus, the invention discloses a correction circuit arrangement for a receiver channel which provides a distortion corrected output signal by effectively removing the distortion generated by the receiver.