Patent ID: 6172560
Filing Date: 2001-01-09
Classification: H03F

Abstract:
A distortion compensation method for compensating distortion components included in an output signal from a main amplifier when an input signal including a plurality of carrier components each having a different frequency from one another is amplified and output by said main amplifier, comprising steps of:generating a distortion signal by combining, at a first coupling point, a first branch signal branched from said input signal at a first branching point with a second branch signal branched from said output signal at a second branching point;preventing said plurality of carrier components from leaking from said first or second branch signal into said distortion signal, wherein said step of generating the distortion signal is executed while performing amplitude and phase adjustment according to a control signal in at least one of a plurality of signal paths from said first branching point to said first coupling point such that said distortion signal is rendered to primarily indicate said distortion components;generating a distortion compensated signal based on said output signal by compensating said distortion components included in said output signal using said distortion signal, said distortion components being either suppressed or eliminated in said distortion compensated signal; andgenerating said control signal by performing synchronizing detection of said distortion signal using a reference signal as reference, wherein said reference signal is generated based on any one of said input signal, said output signal, or said distortion compensated output signal, or based on a branch signal of any one of those signals, said reference signal including said plurality of carrier components and being regulated to a level such that average power of said reference signal does not alter even when a total average power of the carrier components included therein changes.