Feedforward predistortion linearizer

Details Feedforward predistortion linearizer Feedforward predistortion linearizer

1989-11-28

1991-01-22

Mullins, James B.

Amplifiers

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

328163, H03F 132

Patent

active

049873784

ABSTRACT:
A feedforward predistortion equalizer includes a first loop with a signal divider for dividing signals into first and second portions, and a distortion generator for distorting the second signal. The first loop is completed by a signal combiner which combines the undistorted first signal and the distorted second signal. The phase and amplitude of the signals in the loop are controlled so that the linear or carrier signal component is cancelled, leaving at the output of the first combiner only the distortion component of the distorted signal. A second loop includes phase and amplitude controls for combining the pure distortion and undistorted signals to produce the desired predistorted signals. In a particular embodiment, the phase and amplitude controls of the first loop are automatically adjusted for a null.

REFERENCES:
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patent: 4532478 (1985-07-01), Silagi
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patent: 4629996 (1986-12-01), Watanabe et al.
patent: 4698597 (1987-10-01), Merli et al.
Nojima et al., "Predistortion Nonlinear Compensator for Microwave SSB-AM System," The Proceedings of ICC80, The 1980 International Conference on Communications, Seattle, WA, Jun. 8-12, 1980.
"Linearization Techniques for Travelling Wave Tube and Solid State Power Amplifiers", by Kumar, published by RCA David Sarnoff Research Center, date not included.

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