Feed forward amplifier improvement

Details Feed forward amplifier improvement Feed forward amplifier improvement

1997-12-19

1999-11-30

Pascal, Robert

Amplifiers

With amplifier bypass means

330149, H03F 132

Patent

active

059949570

ABSTRACT:
The present invention is a feed forward circuit and method for reducing distortion added to an output signal of the feed forward by its amplifiers without increasing the time delay in the main circuit path of the feed forward circuit. This is accomplished using a pre-distortion circuit to introduce a pre-distortion signal to the input signal of a correction amplifier. The pre-distortion signal is being used to cancel a distortion signal that will be introduced by the correction amplifier. The pre-distortion signal has approximately the same frequency and amplitude as the distortion signal. The pre-distortion signal, however, has a phase difference of approximately 180.degree. with respect to the distortion signal such that the pre-distortion signal and the distortion signal cancel each other when combined.

REFERENCES:
patent: 3471798 (1969-10-01), Seidel
patent: 4879519 (1989-11-01), Myer
patent: 4885551 (1989-12-01), Myer
patent: 4926134 (1990-05-01), Olver
patent: 5077532 (1991-12-01), Obermann et al.
patent: 5130663 (1992-07-01), Tattersall, Jr.
patent: 5304945 (1994-04-01), Myer
patent: 5774018 (1998-06-01), Gianfortune et al.

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