Low-distortion radio-frequency amplifying apparatus

Details Low-distortion radio-frequency amplifying apparatus Low-distortion radio-frequency amplifying apparatus

1990-12-26

1992-09-29

LaRoche, Eugene R.

Amplifiers

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

330284, 330144, 330136, 455 63, 307529, 328162, H03F 126

Patent

active

051516640

ABSTRACT:
A low-distortion radio-frequency amplifying apparatus is equipped with a distortion compensating circuit for generating a distortion signal which cancels a distortion generated during radio-frequency amplification. The apparatus detects a signal corresponding to an envelope power of the output or input of an amplifier, varies a distortion compensating characteristic according to the power value, and compensates a distortion over a wide dynamic range. The apparatus includes a detector for detecting an envelope detection signal of the amplifier, and a controller for compensating the distortion compensating characteristic according to the detected signal.

REFERENCES:
patent: 4329655 (1982-05-01), Nojima et al.
patent: 4331928 (1982-05-01), Heidt
patent: 4570127 (1986-02-01), Tanimoto et al.
patent: 4574248 (1986-03-01), Snodgrass
patent: 4879519 (1989-11-01), Myer
Copy of European Search Report--Communication--Oct. 18, 1991.
Japanese Patent Publication No. 52-5240 (English translation of Abstract) Jan. 14, 1977.
English translation of "A Predistortion Type Equi-Path Linearizer in Ku-Band", presented at EICIN Connection, 1990.
"19th European Microwave Conference Proceedings", pp. 706-712, 4-7, Sep. 1989.
"A Predistortion Type Equi-Path Linearizer in Ku-Band", Spring in 1990.

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