High noise immunity input level detector with hysteresis

Details High noise immunity input level detector with hysteresis High noise immunity input level detector with hysteresis

1987-08-13

1989-01-17

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 307529, H03K 5153

Patent

active

047989750

ABSTRACT:
A logic interface signal input with a high degree of electrical noise immunity, particularly suited for use in an automative environment for detecting an on/off control signal multiplexed with an information signal such as a voice audio signal. The invention provides a fast logic output signal in response to the level of the control signal, which is suitable for driving higher speed circuitry and which permits detection to be highly immune from electrical transients or variations in power supply voltage. The invention permits the information signal to be combined with the control signal through polarized means, such as an electrolytic capacitor.

REFERENCES:
patent: 3553486 (1971-01-01), Dow
patent: 3656002 (1972-04-01), Gilson et al.
patent: 4438349 (1984-03-01), Shoji
patent: 4455534 (1984-06-01), Gillig
patent: 4581541 (1986-04-01), Nakayama et al.
"On/Off Sense Circuit in a Dynatac Coam Cellular Mobile Radio" sold by motorola.
Motorola Catalog No. CR720 "Remote CB Radio".

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