Method and apparatus for improved fed forward amplification

The quality and efficiency of producing an amplified signal output from a feed-forward amplifier system having reduced distortion and noise is provided. Multiple adjusters are included in the signal cancellation loop of a feed-forward amplifier system so as to more accurately adjust the different frequencies within a frequency band. For example, in a multi-carrier feed-forward amplifier system two or more adjusters are provided in the signal cancellation loop so as to provide more accurate adjustment for the various carriers rather than relying on a single adjuster to adjust for all carriers. According to one variation of the invention, two adjusters are provided in the signal cancellation loop of a two carrier multi-carrier feed-forward amplifier system. Each of the two adjusters adjusts a respective one of the two carriers. The outputs of the adjusters are combined and input to a delay element in the signal cancellation loop. According to another variation of the invention, the outputs of the adjusters are combined and input to the amplifier in the signal cancellation loop.