Feed forward amplifier with digital intermodulation control

Details Feed forward amplifier with digital intermodulation control Feed forward amplifier with digital intermodulation control

1997-12-23

1999-06-15

Pascal, Robert

Amplifiers

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

330151, H03F 126

Patent

active

059125861

ABSTRACT:
A feed forward amplifier with digital intermodulation control (200) includes an up-converter (219), a feed forward amplifier (100), a down-converter (230), and a digital intermodulation controller (214). The up-converter (219) receives a first digital input (218) and generates an analog composite signal (140) and a reference frequency signal (221). The feed forward amplifier (100) receives the analog composite signal (140) and produces an amplified analog composite signal (147) and an amplified analog composite signal sample (126). The down-converter (230) mixes the amplified analog composite signal sample with the reference frequency signal in a mixer (216) to produce an adjusted amplified analog composite signal sample (128) which is then converted to a second digital (226) input via an analog-to-digital converter (215). A digital intermodulation controller receives first digital input and second digital input and subsequently generates a phase and gain adjuster input (224, 225) for adjusting the feed forward amplifier (100).

REFERENCES:
patent: 4361892 (1982-11-01), Martin
patent: 4879519 (1989-11-01), Myer
patent: 5077531 (1991-12-01), Obermann et al.
patent: 5130663 (1992-07-01), Tatterall, Jr.
patent: 5166634 (1992-11-01), Narahashi et al.
patent: 5386198 (1995-01-01), Ripstrand et al.

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