Input interface circuit for removing noise components of an inpu

Details Input interface circuit for removing noise components of an inpu Input interface circuit for removing noise components of an inpu

1993-02-04

1994-04-05

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307520, 307518, 328111, 328164, H03K 522

Patent

active

053008200

ABSTRACT:
Each channel of an input interface circuit for suppressing noise contained in input signals to a CPU (microcomputer) of an automobile includes: a level determining circuit for shaping the waveform; a clock circuit for generating sampling clock pulses; a sequential memory circuit, clocked by the clock pulses, for sampling the output levels of the level determining circuit and storing at least two successive output levels; and a resetting circuit which is set when all the levels stored in the sequential memory circuit are high, and which is reset when all the levels stored in the sequential memory circuit are low. The noise pulses contained in the output of level determining circuit are thus effectively removed.

REFERENCES:
patent: 4282489 (1981-08-01), DeRienzo
patent: 4427948 (1984-01-01), Rinaldi
patent: 4525635 (1985-06-01), Gillberg
patent: 4578653 (1986-03-01), Howell
patent: 4847577 (1989-07-01), Gerhart et al.
patent: 4967108 (1990-10-01), Lee et al.
patent: 5001374 (1991-03-01), Chang

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