Predistorter for linearization of electronic and optical signals

Details Predistorter for linearization of electronic and optical signals Predistorter for linearization of electronic and optical signals

1989-09-07

1991-02-12

Mullins, James B.

Amplifiers

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

328163, H03F 132

Patent

active

049927540

ABSTRACT:
An electronic circuit provides a linear output from an amplitude modulated transmission device such as a solid state laser which has inherent distortion. The distortion of the nonlinear device is compensated by applying a predistorted signal equal in magnitude and opposite in sign to the distortion introduced by the nonlinear device. The input signal is split into two paths with primary part of the signal applied directly to the device, with a time delay to compensate for delays in the secondary path. A predistorter in the secondary path generates harmonic signals, the amplitude of which is adjusted to match the amplitude of the distortion. A tilt adjustment is made to compensate the amplitude of the predistortion for frequency dependence of distortion. A fine adjust of the delay is also included so that phase of the predistortion signal is in proper phase relation with the primary signal. A push-push amplifier is used as a distorter, with bias current unbalanced to produce net odd harmonics as well as even harmonics of the fundamental frequencies.

REFERENCES:
patent: 4068186 (1978-01-01), Sato et al.

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