Glitch detector and trap

Details Glitch detector and trap Glitch detector and trap

1978-07-05

1980-04-15

Heyman, John S.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

328151, 340347CC, 340347DA, H03K 1332, H03K 1302, H03K 518

Patent

active

041986083

ABSTRACT:
A glitch detector and trap circuit is disclosed for removing a glitch generated by a digital-to-analog (D/A) converter due to an error in one or more bits of the input digital signal. The analog output signal is delayed by one sample period. The converter output signal is then subtracted from the delayed converter output signal. This difference signal is passed through a full-wave precision rectifier. Thereafter, the notified signal is clipped at a predetermined trigger level so that a glitch will cause an output pulse. The output pulse caused by a glitch is used to operate a monostable circuit. The monostable circuit in turn, is utilized to change a track and store amplifier from its track mode to the store mode. In this manner, the track and store amplifier will not pass the glitch, but will remain at its previous setting. A rise-time delay circuit is interposed ahead of the track and store amplifier so that it will not respond instantaneously to the next sample pulse before its store mode is initiated.

REFERENCES:
patent: 3665327 (1972-05-01), Prentky et al.
patent: 3800236 (1974-03-01), Riethmuller et al.
patent: 3877023 (1975-04-01), Spicer et al.
patent: 4016559 (1977-04-01), Pastoriza
patent: 4132908 (1979-01-01), Hughes
A Users Handbook of D/A & A/D Converters by Hnatek Copyright 1976, John Wiley & Sons Inc. "Sources of Error in D/A Conversion" pp. 238-242.

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