Noise detection circuit

Details Noise detection circuit Noise detection circuit

1999-05-11

2000-12-19

Nelms, David

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

326 9, H03K 1716

Patent

active

061631647

ABSTRACT:
In order to realize the object of the present invention, which is to provide a noise detection circuit which is capable of coping with any pulse width of noise, and also of properly detecting the noise pulses which are consecutively generated, the noise detection circuit comprises a level monitoring circuit for monitoring the logic level of a signal input to a peripheral circuit within a microcomputer that needs to receive an input signal having a logic high level constantly for a certain period; wherein the level monitoring circuit further comprises a NOT circuit that inverts the polarity of a level monitoring signal input from the peripheral device for determining a signal level monitoring period, and an OR circuit that performs an OR operation between the output from the NOT circuit and the signal input to the peripheral device.

REFERENCES:
patent: 4282488 (1981-08-01), Noeman et al.
patent: 4775840 (1988-10-01), Ohmori et al.
patent: 5059834 (1991-10-01), Tago et al.
patent: 5878094 (1999-03-01), Nowak et al.

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