Patent ID: 6734727
Filing Date: 2004-05-11
Classification: H03F

Abstract:
A feedforward amplifier having:amplifying means of amplifying an input signal to obtain an amplified signal; pilot signal generating means including a local oscillator, a frequency divider, and a mixer, an output of said local oscillator being provided to said frequency divider and said mixer, an output of said frequency divider being provided to said mixer, said mixer generating a pilot signal; combining means of combining at least one of said input signal of said amplifying means and said output signal from said amplifying means with said pilot signal to generate a combined signal; extracting means of extracting any distortion component from said combined signal; output signal generating means of generating an output signal without the extracted distortion component; and adjusting means of using any one of the output of said local oscillator, the output of said frequency divider, said pilot signal and said output signal from said output signal generating means to make an adjustment for removing said distortion component.