Detection circuit and structure therefor

Details Detection circuit and structure therefor Detection circuit and structure therefor

1978-02-22

1980-07-29

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307308, 307362, H03K 3353, H03K 5153

Patent

active

042152810

ABSTRACT:
A detection circuit particularly adapted as a smoke detector employs a minimum number of components by a CMOS integrated circuit which receives directly the output of a smoke detector on one of the inputs of an input comparator circuit which provides static input protection and a high input impedance by employing thick oxide layer over the gates of the comparator transistors. The CMOS chip also directly supplies operating current for a mechanical or piezoelectric horn. Further features include a clocked low voltage alarm; a buffer stage to permit the interconnection of a number of different detector circuits in common to a single input/output lead; and a visual LED indicator to indicate that the circuit is operating and to provide a visual indication any time the alarm condition for the circuit has been actuated.

REFERENCES:
patent: 4048575 (1977-09-01), Musa
R. L. Hedman et al, "Integrated Comparator with Active Hysteresis" IBM Technical Disclosure Bulletin vol. 19, No. 2 Jul., 1976 pp. 634-635.

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