RFI suppression by cascading nonlinear devices

Details RFI suppression by cascading nonlinear devices RFI suppression by cascading nonlinear devices

1994-09-30

1996-10-08

Pham, Chi H.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455308, 455303, 327324, H04B 110

Patent

active

055640958

ABSTRACT:
An enhanced nonlinear signal processor for RFI suppression using either biased null zone amplifier or a biased inverting limiter. Two or more nonlinear interference processors are connected in cascade. As a result, a deliberate tracking error, selected to provide only a small amount of relative interference rejection, is introduced into each processor. The effect of each stage is cumulative until some limit to performance improvement, determined by the input/output characteristic of each stage, is reached. The benefits of this discovery are increased dynamic range capability (higher levels of interference-to-wanted signal ratio can be fully rejected), simplification of gain control, and increased flexibility in hardware implementation options resulting from reduced sensitivity to RFI tracking error.

REFERENCES:
patent: 4167681 (1979-09-01), Wolkstein et al.
patent: 4479250 (1984-10-01), Flood
patent: 5023490 (1991-06-01), Gittinger
patent: 5134721 (1992-07-01), Fujimoto
patent: 5379445 (1995-01-01), Arstein et al.

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