Third-order predistortion linearization circuit

Details Third-order predistortion linearization circuit Third-order predistortion linearization circuit

1991-05-21

1992-12-15

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307491, 307492, 307268, 330149, G06G 710, G06G 724

Patent

active

051720680

ABSTRACT:
A predistortion circuit for cancelling third-order distortion products produced by a non-linear device includes a signal source which drives a first and second circuit branch each including a plurality of series connected diodes having approximately exponential transfer functions. The output signal taken as the summation of the two signals processed by the branch circuits is coupled through an amplifier to the device to be linearized. In an alternate predistortion configuration, the signal source drives a phase splitting means which produces two signals of equal amplitude but opposite phase, wherein each of the signals drives a respective one of the branch circuits. A phase combining means performs an out of-phase combination of the signals processed by the branch circuits.

REFERENCES:
patent: 4600847 (1986-07-01), Baum
patent: 4752743 (1988-06-01), Pham et al.
patent: 4943783 (1990-06-01), Nojima
patent: 4987378 (1991-01-01), Eggleston et al.
patent: 4992754 (1991-02-01), Blauvelt et al.
H. K. V. Lotsch, "Theory of Nonlinear Distortion Produced in a Semiconductor Diode," IEEE Trans. of Elec. Devices, vol. ED-15, No. 5, pp. 294-307 (1968).
Darcie et al., "Lightwave Subcarrier CATV Transmission Systems", IEEE Trans. on Microwave Theory and Techniques, vol. 38, No. 5, pp. 524-533 (1990).

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