A NOVEL CANCELLATION LOOP, FOR A FEED-FORWARD AMPLIFIER, EMPLOYING AN ADAPTIVE CONTROLLER

摘要

An adaptive control system (382) and method is provided in a feed-forward linear amplifier (75), and in particular a multi-channel linear amplifier, wherein analyzed distorsion or error detection of nonlinear distortion components of the output signal of a main amplifier element (105) is used to correct distortion in amplification of an information signal using a two-stage distortion correction circuit. Analysis of the distortion is based on a sweep of the entire operating frequency band from which the distortion components are extracted. I.F. sampling (sub-harmonic sampling) may be used in analog to digital conversion of an I.F. signal to detect the distortion within a passband.