Feed forward linear amplifier

Details Feed forward linear amplifier Feed forward linear amplifier

1988-10-31

1989-12-05

Mullins, James B.

Amplifiers

With pilot frequency control means

330151, H03F 132

Patent

active

048855510

ABSTRACT:
A feed forward circuit receives an input signal having at least one carrier therein in a prescribed frequency range. The input signal is applied to a first circuit path having a power amplifier that produces an output signal with a distortion component and to a second circuit path that delays the input signal without distortion. The output signal of the first circuit path is combined with the output signal of the second circuit path to form a signal representative of the distortion component of the first circuit path output signal and the distortion component representative signal is subtracted from the output signal of the first circuit path to cancel the distortion component therein. The prescribed frequency range of the first circuit path output is scanned to detect a carrier signal and the amplitude and phase of the signal in the first circuit path is modified to minimize the magnitude of the detected carrier in the distortion representative signal.

REFERENCES:
patent: 3886470 (1975-05-01), O'Neil et al.
patent: 3922617 (1975-11-01), Denniston et al.
patent: 4389618 (1983-06-01), Bauman
patent: 4394624 (1983-07-01), Bauman
patent: 4412185 (1983-10-01), Gerard
patent: 4580105 (1986-04-01), Myer

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