Feed-forward correction loop with adaptive predistortion injecti

Details Feed-forward correction loop with adaptive predistortion injecti Feed-forward correction loop with adaptive predistortion injecti

1996-07-23

1998-06-02

Mullins, James B.

Amplifiers

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

330151, H03F 132

Patent

active

057606463

ABSTRACT:
A linearization scheme for an RF power amplifier combines an adaptive predistortion modulator with a feedforward error correction loop, which cancels noise imparted by predistortion modulation to the amplified signal, and minimizes distortion in the RF amplifier's output to a level that allows the use of a low cost auxiliary RF error amplifier in the feed-forward loop. The predistortion correction mechanism produces a predistortion signal based upon the input signal and is adaptively adjusted by an error signal extracted from the output of the a main RF power amplifier. The input signal is supplied to a work function generator unit and to a subtraction unit, which is also coupled to receive a fractional portion of the amplifier output signal and outputs the RF error component. The RF error component is coupled to a predistortion function generator, which is driven by the work function generator unit. The predistortion modulator uses the output of the predistortion function generator to predistort the input signal by a compensation characteristic equal and opposite to the distortion expected at the output of the main RF amplifier. When subjected to the transfer function of the RF amplifier, the predistortion signal injected into the input signal path will effectively cancel the amplifier's anticipated distortion behavior. The predistortion is made adaptive by tracking the error signal and coupling this error signal to the predistortion function generator.

REFERENCES:
patent: 4943783 (1990-07-01), Nojima
patent: 5157345 (1992-10-01), Kenington

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