Auto-balance method and apparatus for suppression of residual lines in a transmitted spectrum

摘要

An automatic residual line suppression system for use with a spread spectrum signal wherein a narrow-band sample of the signal around a selected frequency is multiplied by a dithered signal in an auto-balance control loop. A resulting signal is used to control the dc offset of a mixer in order to minimize the residual carrier line in the signal spectrum while any remaining detectible residual lines are smeared by a noise source during up-conversion.