Patent ID: 6285255
Filing Date: 2001-09-04
Classification: H03C,H03F,H04B

Abstract:
A circuit for adaptively compensating for carrier signal phase distortion caused by amplitude modulating an RF carrier signal, comprising:a modulator-amplifier network for receiving an RF carrier signal and modulating it by a received amplitude varying signal to obtain therefrom a modulated RF carrier signal which is phase shifted from the phase of the carrier signal applied to said network by an amount that varies with the value of said amplitude varying signal;a phase shifter that receives an RF carrier signal and phase shifts it in accordance with the value of a received phase correction signal to provide a pre-phase shifted carrier signal that is applied to said modulator-amplifier network that provides said modulated RF carrier signal;a phase detector that receives and compares said modulated RF carrier signal and said carrier signal and provides an error signal in accordance with said comparison; and,an adaptive controller that provides said correction signal and which receives said error signal and said amplitude varying signal and varies the value of the correction signal in accordance with the value of said error signal and the value of said amplitude varying signal.