Adaptive equalization system for nonlinearities

Details Adaptive equalization system for nonlinearities Adaptive equalization system for nonlinearities

1980-01-31

1982-05-11

Mullins, James B.

Amplifiers

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

328163, 333 18, H03F 133

Patent

active

043296556

ABSTRACT:
An adaptive equalization system for compensating the nonlinearities generated in a traveling-wave tube amplifier comprises an equalization circuit connected to the traveling-wave tube amplifier. The equalization circuit has a series circuit having a distortion generator for providing a high order distortion, a variable phase shifter and a variable attenuator for controlling the phase and the amplitude of the output of the distortion generator, and a delay line connected parallel to said series circuit so that the delay time in the delay line is equal to the delay time in that series circuit. A distortion detector is provided at the output of the traveling-wave tube amplifier for detecting the residual distortion in the output signal, and a distortion control circuit is provided for adjusting the variable phase shifter and the variable attenuator so that the residual distortion at the output of the traveling-wave tube amplifier becomes minimum.

REFERENCES:
patent: 4068186 (1978-01-01), Sato et al.
Falconer, "Adaptive Equalization of Channel Non-Linearities in QAM Data Transmission Systems," The Bell System Technical Journal, Sep. 1978, pp. 2589-2611.

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