Feedforward distortion compensation circuit

Details Feedforward distortion compensation circuit Feedforward distortion compensation circuit

1994-11-21

1996-02-20

Mullins, James B.

Amplifiers

With pilot frequency control means

330151, H03F 132

Patent

active

054932521

ABSTRACT:
A feedforward distortion compensation circuit includes a main amplification path, an auxiliary amplification path, first and second transmission paths, a signal attenuation path, a first signal injector, a first signal distributor, a second signal injector, a first signal synthesizer, a first phase difference detector, a first level detector, a second phase difference detector, a second signal synthesizer, a second level detector, and a control circuit. The control circuit controls a first variable attenuator and a first variable phase shifter such that a detection level of the first level detector becomes minimum, and first pilot signals synthesized by the first signal synthesizer on the basis of a phase difference detected by the first phase difference detector respectively have opposite phases, and controls a second variable attenuator and a second variable phase shifter such that a detection level of the second level detector becomes minimum, and second pilot signals synthesized by the second signal synthesizer on the basis of a phase difference detected by the second phase difference detector respectively have opposite phases.

REFERENCES:
patent: 5155448 (1992-10-01), Powell

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