Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1992-11-18
1995-06-13
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
342 19, 342159, 327551, 327 47, H04B 110
Patent
active
054246741
ABSTRACT:
Two wide dynamic range detection circuits are disclosed, which are capable of detecting low-level desired signals in the presence of nearby strong interfering signals. Each circuit includes an attenuator scheme for attenuating the interfering signal while passing the desired signal. The first attenuator scheme uses a YIG filter in combination with an automatic gate arrangement. The second attenuator scheme uses a two-channel arrangement. The first channel uses a chirp-Z processor to derive a pulse-type transform signal in response to the strong interference signal. The second channel includes a YIG filter followed by a programmable notch filter which is controlled by the interference-signal pulse from the first channel. Following the programmable notch filter in the second channel is a chirp-Z processor followed by a gate arrangement wherein the gates are switched "OFF" under control of the interference-signal pulse from the first channel.
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W. Skudera, "SAW Tapped Delay Lines for New Potential Circuit Application Proceedings of the 42nd Annual Frequency Control Symposium 1988, IEEE Catalog No. 88CH2588-2, Library of Congress No. 58-60781.
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J. McCole et al., "Applications of YIG Devices," Microwaves, Sep. 1965.
Widrow et al., "Adaptive Noise Cancelling: Principles and Applications", Proceedings of the IEEE, vol. 63, No. 12, Dec. 1975.
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Albert Stuart D.
Mariani Elio A.
Skudera, Jr. William J.
Anderson William H.
Callahan Timothy P.
Le Dinh
The United States of America as represented by the Secretary of
Zelenka Michael
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