Balanced reflective nonlinear processor using FETs

Details Balanced reflective nonlinear processor using FETs Balanced reflective nonlinear processor using FETs

1991-08-30

1992-09-08

Mottola, Steven

Amplifiers

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

330286, H03F 132, H03F 360

Patent

active

051461773

ABSTRACT:
A nonlinear processor for use as a signal limiter or predistortion equalizer includes a four-port, 3dB directional coupler. Signal to be distorted is applied to a first port of the coupler, and is coupled by second and third ports to a pair of nonlinear circuits. Each nonlinear circuit includes the source-to-drain transmission path of a FET. Each nonlinear circuit is grounded or short-circuited, to form a nonlinear reflective circuit which reflects the energy back to the associated port of the coupler. The nonlinearly reflected energy is received at the two coupler ports, and is combined and made available at the fourth coupler port. The input return loss of the processor is improved by matching the nonlinear circuits to each other.

REFERENCES:
patent: 4564816 (1986-01-01), Kumar et al.
patent: 5038113 (1991-08-01), Katz et al.
An article entitled "Simple Circuit Instantly Cuts Jammer Signals", by Gagnon, published at pp. 135-140 of the Sep. 1990 issue of Microwaves and RF magazine.

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