Double filtering glitch eater for elimination of noise from sign

Details Double filtering glitch eater for elimination of noise from sign Double filtering glitch eater for elimination of noise from sign

1994-01-24

1996-10-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By pulse width or spacing

327 31, 327551, 327552, 327270, 327311, 327306, 327165, H03K 500

Patent

active

055635326

ABSTRACT:
A glitch filter for eliminating noise pulses less than 12 nanoseconds (ns) created by large devices on the SCSI bus and reflections of the 12 ns pulses created by a long SCSI bus cable, as well as noise pulses on the order of 35 ns typically found on a SCSI bus. The glitch filter includes a Schmitt trigger connected to receive the SCSI bus signal along with three filters connected in series with the Schmitt trigger. The first filter removes positive pulses having a pulse width less than 12 ns and provides an inverted output. The second filter removes negative pulses having a pulse width less than 12 ns and provides an inverted output. The third filter removes pulses having a pulse width less than 35 ns and provides the output of the glitch filter.

REFERENCES:
patent: 3970944 (1976-07-01), Huellwegen
patent: 4105980 (1978-08-01), Cowardin et al.
patent: 4797585 (1989-01-01), Segawa et al.
patent: 5113098 (1992-05-01), Teymouri
patent: 5162666 (1992-11-01), Tran
patent: 5198710 (1993-03-01), Houston
patent: 5265038 (1993-11-01), Kwok
patent: 5396633 (1995-03-01), Mayer et al.

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