Spur attenuation devices, systems, and methods

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

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Details

C327S363000, C455S307000

Reexamination Certificate

active

07965134

ABSTRACT:
Exemplary embodiments of the invention disclose signal filtering. In an exemplary embodiment, a filter device may comprise a subtractor operably coupled between an input and an output and configured to receive an input signal comprising a desired component and at least one undesired frequency component. The filter device may further include a feedback loop configured to receive at least one of the input signal and an output signal from the subtractor and convey a feedback signal comprising at least one undesired component to the subtractor. Each undesired component of the feedback signal corresponds to an associated undesired component of the input signal. Furthermore, the subtractor subtracts the feedback signal from the input signal and convey the output signal.

REFERENCES:
patent: 5995567 (1999-11-01), Cioffi et al.
patent: 7483685 (2009-01-01), Lewis
patent: 2008/0233894 (2008-09-01), Aparin
patent: 1531553 (2005-05-01), None
International Search Report and Written Opinion—PCT/US2010/028738, International Search Authority—European Patent Office—Aug. 10, 2010.

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