Power amplifier device comprising a plurality of feedforward dis

Details Power amplifier device comprising a plurality of feedforward dis Power amplifier device comprising a plurality of feedforward dis

1993-01-14

1995-05-02

Mullins, James B.

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330151, 455 501, H03F 132

Patent

active

054123429

ABSTRACT:
For supply to first and second feedforward distortion compensating circuits 33(1), 33(2) connected in parallel, a two-divider 31 divides into signals of a common phase and a common amplitude an input or composite radio frequency signal supplied to an input terminal 11. The composite radio frequency signal collectively has a plurality of radio frequency signals of different frequencies. A two-combiner 35 combines component outputs of the feedforward circuits in inphase as an amplified output signal which is supplied to an output terminal 13. In general, N feedforward circuits (N being an integer not less than two) are connected in parallel and are supplied with the input radio frequency signal through an N-divider. Component outputs of the feedforward circuits are combined in inphase as the output signal by an N-combiner. Alternatively, the input radio frequency signal is divided into signals of a predetermined phase difference and of a common amplitude by the N-divider. In this case, the component outputs of the feedforward circuits are combined in a phase of cancelling the predetermined phase difference by the N-combiner.

REFERENCES:
patent: 4598254 (1986-07-01), Saito et al.
patent: 4926136 (1990-05-01), Olver
patent: 5166634 (1992-11-01), Narahashi

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