Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By pulse width or spacing
Reexamination Certificate
2002-09-19
2003-12-30
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By pulse width or spacing
C327S551000
Reexamination Certificate
active
06670832
ABSTRACT:
FIELD OF THE INVENTION
The present invention is related to electronic circuits, and more specifically to filter circuits.
BACKGROUND OF THE INVENTION
Many electronic circuits are subjected to noise, or “glitches” that may adversely affect their intended operation. For example, noise in the input can cause problems for the circuit.
The glitches can also cause the circuit to fail. These problems could possibly be catastrophic for the application in which the electronic circuit fails.
SUMMARY OF THE INVENTION
Briefly described, the present invention is directed at providing an apparatus and method that prevents glitches in the signal from interfering with the operation of the circuit.
According to one aspect of the invention, the apparatus consists of a glitch detect filter circuit that generates a fixed output signal that is unaffected by changes to the input signal for a predetermined period of time.
According to yet another aspect of the invention, the glitch detect filter system detects frequencies and pulse widths that are out of normal range.
According to yet another aspect of the invention, a method is provided to detect and filter out glitches that allow a circuit to operate normally during the glitch.
REFERENCES:
patent: 5087828 (1992-02-01), Sato et al.
patent: 5151612 (1992-09-01), Ishikawa
Merchant & Gould P.C.
National Semiconductor Corporation
Sullivan Timothy P.
Wells Kenneth B.
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