Detection circuit and structure therefor

Details Detection circuit and structure therefor Detection circuit and structure therefor

1979-11-13

1982-08-10

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307304, 307475, H03K 502

Patent

active

043440029

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: 3378783 (1968-04-01), Gibson
patent: 3937983 (1976-02-01), Reed
patent: 4063117 (1977-12-01), Laugesen et al.

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