Method and apparatus for feedforward power amplifying

Details Method and apparatus for feedforward power amplifying Method and apparatus for feedforward power amplifying

1994-07-29

1995-08-22

Mullins, James B.

Amplifiers

With pilot frequency control means

330151, H03F 132

Patent

active

054444187

ABSTRACT:
A feedforward distortion minimization circuit includes a first loop with an input splitter and first and second signal paths, each signal path having an amplifier. An output combiner couples the two signal paths and has an output signal path and an output dump load path. A first signal detector on the dump load path detects a dump load signal, and in response a gain and phase controller operates to adjust the gain and phase of a first signal on one of two signal paths to minimize the power delivered to the dump load. The feedforward circuit also includes embodiments in which both amplifiers operate at around the same power amplification level, and in which a second loop has an error amplifier for further distortion correction.

REFERENCES:
patent: 4394624 (1983-07-01), Bauman
patent: 4517521 (1985-05-01), Prechutti et al.
patent: 5077532 (1991-12-01), Obermann et al.
patent: 5130663 (1992-07-01), Tattersall, Jr.
patent: 5307022 (1994-04-01), Tattersall, Jr. et al.
H. Seidel, "A Microwave Feed-Forward Experiment", The Bell System Technical Journal, Nov. 1971, vol. 50, No. 9, pp. 2879-2916.

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