Patent ID: 6037837
Filing Date: 2000-03-14
Classification: H03F

Abstract:
A feed forward amplifier comprising:a first power divider for dividing an input signal into two divided signals,a first delay circuit for delaying one of the divided signals from the first power divider,a main amplifier having one power amplifier or a plurality of power amplifiers connected in parallel for amplifying an output signal from said first delay circuit,a second power divider for dividing the other divided signal from said first power divider into two output signals,a first vector adjuster for adjusting an amplitude and phase of one of said output signals from the second power divider,a distortion detecting amplifier for amplifying an output signal from the first vector adjuster,a second delay circuit for delaying the other output signal from the second power divider,a distortion detecting power combiner for combining an output signal from said distortion detecting amplifier and an output signal from said second delay circuit, and providing output distortion components,a second vector adjuster for adjusting an amplitude and phase of said output distortion components from the distortion detecting power combiner, anda distortion canceling power combiner for canceling distortion components from an output signal from said main amplifier based on an output signal from said second vector adjuster.