Patent ID: 7053702

Claim:
A pilot-tone generator-receiver for a feed-forward amplifier having a main amplifier and an error-correction pathway, the generator-receiver operable both to generate a pilot tone for injection prior to the main amplifier and to detect the pilot tone in the output of the feed-forward amplifier, the pilot-tone generator-receiver comprising: an oscillator operable to produce an oscillating signal; a means for either increasing or decreasing the frequency of the oscillating signal by an intermediate frequency so as to generate the pilot tone, so that the frequency of the pilot tone injected prior to the main amplifier is either greater than or less than the frequency of the oscillating signal by the intermediate frequency; and a receiver circuit connected to the oscillator and to the error-correction pathway for detecting the level of the pilot tone in an output of the feed-forward amplifier, the receiver circuit connected to the error-correction pathway so that the error-correction pathway is operable introduce a correctional signal prior to the output of the feed-forward amplifier in order to substantially eliminate the pilot tone and any error introduced by the main amplifier from the output of the feed-forward amplifier.