Comparator circuit

Details Comparator circuit Comparator circuit

1983-10-03

1985-09-17

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307354, 307362, H03K 5153

Patent

active

045423032

ABSTRACT:
This relates to a comparator circuit for monitoring intelligence on a data bus, which circuit consumes no power until activated by a predetermined voltage on the data bus. An input PNP transistor has a base coupled to the data bus. An emitter resistor and a collector resistor may be scaled to achieve a desired switching threshold. A second PNP transistor has a base coupled to the bus and an emitter coupled to the collector of the first PNP transistor such that the second PNP transistor does not turn on until the first PNP transistor saturates. The collector of the second PNP transistor is coupled to the base of an output NPN transistor and supplies drive thereto when the second PNP transistor is on.

REFERENCES:
patent: 4115711 (1978-09-01), Moussie

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