METHOD AND APPARATUS RELATING TO SIGNAL CONTROL

摘要

The present invention relates to automatic gain control methods and apparatus for controlling a signal level of a signal at a predetermined location in a signal path of a receiver chain. An automatic gain controller comprises a local signal modifier device for selecting based on an error signal and an oscillator signal from a plurality of alternative oscillator signals, and for providing the selected oscillator signal to a signal mixer located in the receiver chain upstream of said predetermined location for frequency translation of an input signal to said signal mixer.