Feed forward amplifier

Details Feed forward amplifier Feed forward amplifier

1999-02-08

2000-03-14

Pascal, Robert

Amplifiers

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

330151, H03F 126

Patent

active

060378379

ABSTRACT:
A feed forward amplifier comprises a main amplifier 10 composed of a plurality of power amplifiers 8 and 9 combined in parallel. In addition to the plurality of power amplifiers, this feed forward amplifier includes a distortion detecting amplifier 25 for detecting the distortion components, having a distortion characteristic in a predetermined relationship with the distortion characteristic of the main amplifier. It also omits a distortion detecting power combiner 23 otherwise located after a main amplifier 10 and locates a delay circuit 21 before the main amplifier 10 to reduce losses occurring after the main amplifier 10 to improve the efficiency of the entire feed forward amplifier.

REFERENCES:
patent: 4217554 (1980-08-01), Brzozowski
patent: 5043673 (1991-08-01), Suematsu et al.
patent: 5631604 (1997-05-01), Dent et al.
patent: 5644268 (1997-07-01), Hang
patent: 5691668 (1997-11-01), Yoshikawa et al.
patent: 5815036 (1998-09-01), Yoshikawa et al.
European Search Report corresponding to application No. EP 99 10 2396 dated May 26, 1999.

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