Predistortion equalizer with resistive combiners and dividers

Details Predistortion equalizer with resistive combiners and dividers Predistortion equalizer with resistive combiners and dividers

1989-11-22

1991-05-14

Mottola, Steven

Amplifiers

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

330295, H03F 126

Patent

active

050159658

ABSTRACT:
A predistortion equalizer for a power amplifier includes a linear channel and a nonlinear channel. A phase shifter is associated with the linear channel and an attenuator is associated with the nonlinear channel. A resistive power divider divides the received signal which is to be predistorted and divides it into two parts, each of which is applied to one of the channels. The two parts may be equal in magnitude. The linear and nonlinear signals at the outputs of the linear and nonlinear channels, respectively, are combined out-of-phase in a resistive combiner to produce a predistorted signal for appication to a power amplifier. The resistive combiner and divider maximize bandwidth.

REFERENCES:
patent: 3223940 (1965-12-01), Early et al.
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patent: 4010426 (1977-03-01), Rambo
patent: 4109212 (1978-08-01), Donnell et al.
patent: 4329655 (1982-05-01), Nojima
patent: 4430619 (1984-02-01), Epsom et al.
patent: 4465980 (1984-08-01), Huang et al.
patent: 4588958 (1986-05-01), Katz
"Universally Applicable Technique Linearizes Microwave Power Amplitudes", by Gosch, published at pp. 82 and 84 of the Sep. 11, 1980 issue of Electronics magazine.
"Predistortion Nonlinear Compensation for Microwave SSB-AM System", by Nojima et al., published in The Proceedings of ICC80, The 1980 International Conference on Communications, Seattle, Wash., 8-12 Jun. 1980.
"Linearization Techniques for Travelling Wave Tube and Solid State Power Amplifiers", by Kumar published by RCA David Sarnoff Research Center.

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